HIGH SPEED Modem and FAX FAMILY CH2056 CH1799 CH1798 CH1794 – – – – INTRODUCTION FEATURES The CH2056, CH1799, CH1798 and CH1794 (HS Modem Family) are industrial grade high speed modem modules. Each HS Modem product supports a range of modem standards and speeds from 300bps to 14,400bps, 28,800bps, 33,600bps or 56,000bps. By using built in compression algorithms the operating speed can be expanded to the maximum DTE rate of 57.6kps for the CH1794, 115.2Kbps for the CH1798/CH1799 and 230.4kbps for the CH2056. A choice of error correcting schemes is available including MNP 10 for cellular telephone applications. The HS Modem family supports Send and Receive Fax. The CH1799LL operates exclusively on non-voltage bearing leased line. • The HS Modem family is pin compatible with Cermetek’s low cost CH1786 V.22bis, 2400bps modem family. Each module in the HS Modem family is a self-contained modem and is FCC Part 68 approved and Canadian DOT approveable. These ultra small modules are designed for PCB throughhole mounting and are 1.35” x 1.38” x 0.58” in size. The HS Modem family requires only two external interfaces: a CCITT V.24 serial interface that can be routed directly to a UART, and a Tip and Ring interface which goes directly to an RJ11C Jack for the PSTN line connection. The HS Modem can be controlled with industry standard AT commands and is compatible with available industry communication software. • • • • • • • • • • • • • • • • • V.90 / 56,000bps V.34bis / 33,600bps V.34 / 28,800bps V.32bis / 14,400bps Supports V.90, V.34bis, V.34, V.32bis, V.32, V.22bis, V.22A/B, V.23, V.21, Bell 212A and 103 CH2056 supports V.80 Synchronous operation Error correcting: V.42 LAMP, MNP 2-4 and MNP 10 Data Compression: V.42bis and MNP 5 MNP10 Data throughput enhancement for cellular operation DTE serial interface with speeds up to 230.4kbps (CH2056), 115.2kbps (CH1799/CH1798) or 57.6kbps (CH1794) Automatic baud rate adaptability utilizing speed sensing, flow control and data buffers Send & Receive Fax Class 1, Group 3 supported Serial V.24, 5 volt interface NVRAM directory and stored profiles AT Command structure, with extensions Built-in DAA with 1500 VAC RMS isolation 2122V peak surge protection UL 1950 and CSA C22.2 950 Recognized Leased Line version available CH1799LL FCC part 68 Approved/DOT CSA CS-03 Part I Approveable +5 Volt operation with zero power option Small size: 1.35” x 1.38” x 0.61” (nominal) Pin compatible with low speed/low cost CH1786 Figure 1. Function Block Diagram of HS Modem Family. DESCRIPTION OF FUNCTIONAL BLOCKS AND DISCUSSION OF BASIC OPERATIONS Figure 1 contains a functional block drawing of the HS Modem family of products. Each HS Modem product consists of a serial interface buffer, modulator/demodulator, modem controller with error correction and data compression, non-volatile RAM and a DAA. Serial Host Interface Buffer. The HS Modem utilizes a serial V.24 EIA 232-E 5V interface to control the modem. The HS Modem products can communicate over the serial interface with the Data Terminal Equipment (DTE) at a fixed speed regardless of the carrier line modulation speed (DCE) of the PSTN modem connection. This eliminates the need to have the DTE step up or step down in speed based on the incoming or out-going PSTN communication data rate. Hence, the DTE can train the CH2056, to say 56kbps, and talk to a slower incoming data connection at say, 2400bps without changing host speed. Conversely, the host DTE trained at 14.4kbps can also communicate with the modems at higher speeds, say 28.8kbps. This is accomplished by invoking internal automatic data flow control. The HS Modem family has a resident buffer to allow for this auto baud operation. Non-Volatile RAM (NVRAM). NVRAM can store two user-customized configurations. The AT&Wn command will store the active modem configuration in one of two NVRAM locations as selected by an n of 0 or 1. The AT&Yn command selects one of the stored modem configurations to be automatically recalled and made active 2000 Cermetek Microelectronics, Inc. upon reset or power up. The ATZn command immediately recalls and activates a stored configuration. See Tables 7A and 7B for storable S-Registers and Commands. The NVRAM can save up to four telephone numbers, with up to 36 digits or modifiers in each telephone number. The AT&Zn=s command will store s, the telephone number dial string. The ATDS=n command will cause the modem to dial one of the four stored telephone numbers. The NVRAM storage location for the four telephone numbers is selected by an n of 0, 1, 2, or 3. Page 1 Documt No. 607-0003 Revision G (05/00) Telephone Line Interface or DAA. High performance modems are extremely sensitive to DAA (Data Access Arrangement) performance. The difference between a good modem and a fair one is in the DAA performance. The HS Modem family includes a unique low distortion DAA designed for optimal performance over all PSTN line conditions thereby achieving the most reliable and best performance PSTN connections. The HS Modem family is designed to meet North American telephone standards as set by FCC Part 68 (USA) and CSA CS-03 Part I (Canada). Among the more critical parameters, the PSTN line interface is designed to meet 1500 VAC RMS isolation and provide 2122V peak surge protection. Consequently, the HS Modem family of products satisfies U.S. and Canadian requirements, and will meet other international approval agency requirements that specify these levels of isolation. Pins 1 and 2 function as both input and output connections to the PSTN. To maximize field reliability in hostile environments, for Canadian approval, for UL compliance, and also optionally for FCC Part 15 compliance, these two pins must be routed through an external network such as that described in Figure 6A and in Cermetek Application Note # 126. Each HS Modem product comes with FCC Part 68 approval and is shipped from the factory with an FCC label indicating registration number and ringer equivalent. This label should be prominently displayed on the end product. With the exception of the U.S., most countries (including Canada) require submission of the final product or system containing the HS Modem to the appropriate governing regulatory agency for approval. Typically this is accomplished by submitting the final end product to an independent test house or consultant for evaluation. The test house/consultant then forwards the test results and applicable documents to the regulatory agency. Contact Cermetek for a list of suggested consultants. Modulation/Demodulation/ Error Correcting and Data Compression. These functions are provided by an industry standard modem chip set which has been adapted for use with the HS Modem Family. The Modulation/Demodulation scheme supports the industry modem standards listed below. Bell 103 Bell 212A 2000 Cermetek Microelectronics, Inc. SUPPORTED FEATURES AT Command Set. The HS Modem supports the AT Command set with extensions and can operate with industry standard communication software. The AT commands are compatible with TR302.2/88-08006. Serial Host Interface. The HS Modem Family operates in asynchronous mode and supports a 5V, RS232- like interface called V.24 (EIA-232E). The HS Modem supports a full RS-232C/V.24 serial interface. Signal levels are TTL rather than RS-232C level compatible, which allows direct connection of the HS Modem to the host’s UART without level translating circuitry. See Table 3 for a complete set of pin descriptions. The modem is controlled by sending serial commands over TXD and by monitoring serial status messages returned on RXD. All other serial interface lines may be utilized for the convenience of a particular application but are not required by the modem. Unused outputs from the HS Modem should be left unconnected. Unused inputs should be tied to the proper logic level. See Table 3. Speaker Interface. The SPK output reflects the receiver analog input and provides a signal that can be used to monitor call progress. The SPK signal can drive a 300 ohm load directly. Typically, the SPK signal is input into an audio power amplifier and the amplifier, in turn, drives the speaker coil. The speaker is activated with the Atm command. The speaker volume is adjusted using the ATLn command, where n is 0, 1, 2, or 3. Increasing numbers correspond to higher volume. Figure 3 indicates one method of driving an external 8 ohm speaker. Zero Power Mode. If an application calls for zero power during standby periods, the power may be switched off using external circuitry and then reapplied when the HS Modem’s RI pin becomes active. The HS Modem can thus be powered down to zero. The pins of the HS Modem will be in an undefined state when power is switched off. This must be taken into consideration to assure that no unwanted signals are presented to the HS Modem during power down. The HS Modem supports V.42 LAMP, MNP 2-4, MNP 10 error correcting protocols. The CH1794 uses MNP5 data compression techniques and the CH1798/9/CH2056 uses V.42bis data compression, allowing data transmission rates of up to a maximum of 57.6kbps/115.2kbps/230.4kbps, respectively. These high DTE data rates are supported by the HS Modem serial interface via its auto baud capability. Note that the maximum speed attained is limited by the maximum speed available from the DTE. supports Since a modem communicates data serially and most host products handle data in a parallel format, a UART is needed to make parallel-to-serial and serial-to-parallel translations. Referring to Figure 2, the controller activates the relay switch, supplying power (+5V) to the HS Modem. In this configuration, the ring signal is used to “wake up” the HS Modem when the HS Modem is in the power down state. CCITT V.22 CCITT V.22bis CCITT V.32 CCITT V.32bis CCITT V.34 CCITT V.34bis CCITT V.90 The resident Modulator/Demodulator equalization and forward error correction. CONNECTING TO THE HOST UART line Power Supply. The HS Modem module is a complex set of sensitive subsystems. During the course of normal operation, the HS Modem decodes analog signals from the telephone line that are in the millivolt range. Steps must be taken by the user to guarantee that power supply noise on all supply lines, including ground, does not exceed 25 mV peak to peak. If necessary, use dedicated power and ground planes. Failure to provide such operating conditions could cause the HS Modem to malfunction or to function erratically. Page 2 Document No. 607-0003 Revision G (05/00) The HS Modem Family requires a single +5V ±5% supply. It is recommended that bypass capacitors be placed on the power supply as close to the HS Modem’s supply input pins as practical. It is recommended that a 10 µF or greater tantalum capacitor in parallel with a 0.1 µF ceramic capacitor be used. The user must also provide shielding from nearby sources of EMI, such as relays, motors and other power supplies. flow control causes an overall throughput data rate penalty. Table 1. Data Formats Recognized by HS Modem Family. Figure 2. Zero Power Operation. Parity Data Length (No. of Bits) None Odd Even None Odd Even 7 7 7 8 8 8 No. of Stop Bits Character Length (No. of Bits) 2 1 1 1 1 1 10 10 10 10 11* 11* *11 bit characters are sensed, but the parity bits are stripped off during data transmission in Normal and Error Correction modes. Table 2. HS Modem Auto Configuration Based on DTE Configuration. DTE Configuration HS Modem Configuration 7 mark 7 space 8 mark 8 space Automatic Speed/Format Sensing. The HS Modem supports both Command and Data modes of operation. 7 none 8 none 8 none 8 even. Figure 3. Speaker Control Circuit. The HS Modem can automatically determine the speed and format of the data sent from the DTE over the serial interface; and can sense the following broad range of speeds: CH1794 300, 600, 1200, 2400, 4800, 7200, 9600, 12000, 14400, 19200, 38400, and 57600bps CH1798/9 300, 600, 1200, 2400, 4800, 7200, 9600, 12000, 14400, 16800, 19200, 21600, 24000, 26400, 28800, 38400, 57600 and 115200bps CH2056 300, 600, 1200, 2400, 4800, 7200, 9600, 12000, 14400, 16800, 19200, 21600, 24000, 26400, 28800, 38400, 57600, 115200 and 230400bps The data formats in Table 1 are recognized by the HS Modem family of products. The HS Modem can sense data with mark or space parity and configures itself as described in Table 2. The HS Modem is trained to a selected speed with an AT [CR] training sequence. Thus, the DTE to modem serial interface speed can be set independent of the DCE or line carrier connecting speed (with minor restrictions, see the AT + MS command). This allows greater flexibility when selecting DCE line carrier modulation speed thereby affording the user with optimum data throughput performance. To maximize effective modem data throughput speed, the DTE to modem serial interface speed should be set to the highest speed available without invoking the use of the HS Modem’s built-in flow control. Although flow control facilitates communication with higher speed modes by the DTE, use of 2000 Cermetek Microelectronics, Inc. Voice/Tone Injection Port. The HS Modem Family provides pin T1 to allow the user to share the PSTN line interface associated with the modem for voice and DTMF applications. Figure 5 contains a schematic indicating one possible configuration for voice/tone utilization. All HS Modem products are designed with pin T1 coupled directly to the internal DAA. When using the HS Modem in data mode, T1 should float and be disconnected from any potential signal because any signal on T1 during data operation will affect the HS Modem’s output. If T1 is being asserted from another application, use a relay or zero impedance switch to disconnect T1 when in data mode. Referring to Figure 5, use the variable resistor (POT) to set required speaker volume. Page 3 Document No. 607-0003 Revision G (05/00) To maintain FCC compliance, frequencies transmitted while in voice mode should be between 300Hz and 3000Hz. When voice and data are both being used, and the RXA and TXA pins are active, it is typical for voice communication to precede data communication. In this case, the following commands should be used to configure the HS Modem to allow for full utilization of the Voice/Tone injection feature. These commands disable auto-answer and eliminate hangup due to lack of carrier signal. 1. 2. 3. Enter: ATS0=0 [CR] Enter: ATS7=255 [CR] Enter: ATS10=255 [CR] The following command sequences illustrate implementation of common voice/tone port applications. 1. To answer a voice call: (a) Enter: ATH1 [CR] (b) Switch local voice source into RXA and TXA (c) Begin voice conversation. 2. To switch to data mode, switch local voice source from RXA and TXA: (a) At the Originate Modem, enter: ATX1 [CR] (b) At the Answer modem, enter: ATA [CR] 3. To disconnect (hang-up) a voice call or data call: (a) Return to control mode by Entering: +++ (b) Enter: ATH [CR] 4. To place a voice call using the HS Modem DTMF facilities: (a) Enter: ATDT(Tele)#;[CR] (b) Then switch to local voice source MODEM CONTROL The HS Modem may be controlled by sending serial ASCII command sequences. The commands are sent to the modem serially on the TXD pin. After execution of a received command, the modem returns a serial status message that can be read on pin RXD. This message indicates command completion status. Refer to Tables 5A, 5B and 5C for a complete list of status messages. MODEM STATES The HS Modem can be in either command mode or data mode. When the modem is idle, it is in command mode by default and will recognize commands. When data transmission is in progress, the HS Modem is in the data mode state and will not recognize commands. To force the HS Modem to recognize commands, the host must send an “escape sequence” to the HS Modem forcing it out of data mode and into command mode. The escape sequence consists of a “guard time” (a period where no characters are sent to the modem), followed by 3 escape characters, followed by another guard time. At power-up, the guard time is set to 1 second minimum, and the escape character is set as “+.” These two parameters can be modified via registers S2 and S12, respectively. The HS Modem will stay off-hook with its carrier on after the escape sequence is received and it returns an OK status message when it is ready to accept commands. The HS Modem can be put into data mode by issuing the command ATO [CR]. THE COMMAND FORMAT Typical commands consist of three elements: 1. The attention sequence, 2. The commands themselves and 3. A terminating carriage return. WARNING: The HS Modem family of products has been FCC Part 68 approved as data/FAX modems. Utilization of the Voice/Tone Port requires further registration. The FCC requires that the entire system, including the HS Modem and the handset or DTMF transceiver, adhere to Part 68 rules. Figure 4. HS Modem Family Application Diagram. 2000 Cermetek Microelectronics, Inc. Page 4 Document No. 607-0003 Revision G (05/00) AT [commands] [CR]. Where: [AT] represents attention sequence. [commands] represents command strings. [CR] represents carriage return (ASCII 13 or HEX 0D). When entering commands to the modem, the backspace character-control-H (ASCII 8 or HEX 08) can be used to edit mistakes. “AT” and “A/” may not be edited however. Multiple commands may be placed in the command line. A command line may be as long as 40 characters, excluding the letters AT. By way of example, the command below instructs the HS Modem to configure itself to not echo characters when in command mode (E0) and then put itself in answer mode (A). Enter: AT[CR] Where: A and T may be either upper or lower case but must be the same case. [CR] represents carriage return The “AT” sequence is referred to as an attention sequence. The HS Modem will respond with one of the following status messages, depending on whether it is optioned for abbreviated or English status messages. Result: 0[CR] (Abbreviated form) Result: [CR][LF][OK][CR][LF] (English form) Where: [CR] represents carriage return (ASCII 13 or HEX 0D). [LF] represents line feed (ASCII 10 or HEX 0A). Enter: ATE0A[CR] AT Command Set. The available command set is divided into four types of commands : dial modifiers, basic commands, ampersand and percent commands. Refer to the complete list in Tables 6A and 6B. INITIALIZING THE MODEM Before commands may be sent to the HS Modem, the modem must be initialized. This consists of two events: 1. Modem Reset. This is accomplished by applying a hardware reset pulse to pin RST or by switching the power off and then back on. 2. Initial Modem Training. The modem must be trained to the host DTE speed and parity (odd, even, mark, space or none). These activities are briefly described below. Reset. Upon applying power to the HS Modem, the HS Modem automatically generates an internal reset pulse. The user can also reset the modem externally by applying a high-going reset pulse to the RST pin for at least 10ms after the +5V power supply has stabilized. Delay sending commands to HS Modem for 900ms after reset has been initiated to allow the HS Modem time to properly reconfigure. On power up, or when reset is initiated either by command (ATZ) or by the RST pin, the modem will reconfigure to its default state with the line carrier modulation speed set to: 1. 2. 3. 4. 14.4kbps for the CH1794 28.8kbps for the CH1798 33.6kbps for the CH1799 56.0kbps for the CH2056 If desired, any speed, error correction, or data compression method available on the HS Modem can be locked in, using the AT\Nn and/ or AT+MS commands. Training the Modem. Each modem must be trained to match the host DTE speed and parity so that it is able to recognize serial asynchronous commands sent to it by the DTE. The DTE must retrain the modem each time a reset pulse is applied on RST or after a RESET serial command has been issued. Modem Training Command Sequence. The HS Modem is trained by sending it the following sequence: 2000 Cermetek Microelectronics, Inc. The modem is now in idle mode and is ready to accept commands. An alternate attention sequence “A/” may be sent which behaves much like the AT sequence except that it causes the previously entered command specified with an AT prefix to be executed. When given, it must be in upper case ASCII. No carriage return is needed. STATUS MESSAGES AND RESULT CODES A result code is issued by the HS Modem to the DTE for all commands executed by the HS Modem, except dialing commands. Further, various activities on the PSTN are also signaled to the DTE by the HS Modem. All result codes have either a terse, short form version (which is identified by a number followed by a [CR]) or a verbose long form English-like message version (which is preceded and terminated with a [CR] and line feed). The user may suppress certain subsets of the non-extended result codes. This is accomplished by selecting subsets of the result code set using the ATXn command, where n=0, 1, 2, 3. Optionally, the user may specify an extended set of result codes (codes above 35) by setting Register S95. See the detailed description of result codes in Table 5A, Table 5B and Table 5C. All AT commands, other than dialing commands, will be responded to with either an OK (short form result code 0) if the command is valid or accepted, or with an ERROR (result code 4) if the command is not recognized. The detail contained in the error result codes signaled to the DTE depends on the level of message suppression employed by the user. As can be seen from Tables 5A, 5B and 5C, specifying X4 allows the HS Modem to utilize the entire range of non-extended messages, whereas X0 suppresses all but the very basic result codes. Most of the result codes allowed under X1, X2 and X3 are considered call progress status codes and, in practice, are suppressed except for the case of debugging activities. It is recommended that the non-extended result codes be used in all cases. It should be noted that the default connect result codes 9-20 indicate DTE connection speed, not Carrier Line DCE speed. Hence, a CH1794 will connect at a maximum speed of 19.2kbps (result code 16). The CH1798 and CH1799 will connect at a maximum DTE speed of 38.4kbps (result code 17) and the CH2056 will connect at a maximum speed of 57.6kbps (result code 18) unless the DTE is forced to a Page 5 Document No. 607-0003 Revision G (05/00) Table 3. HS Modem Family Pin Descriptions 2000 Cermetek Microelectronics, Inc. Page 6 Document No. 607-0003 Revision G (05/00) higher speed by selection of data compression. In this case, the maximum DTE to modem speed is 230.4kbps (result code 20). Extensions to the basic result code set can be specified by Register S95, which allows for the use of result codes 40 – 64, 165 - 194. Note: Result codes 53 - 64 are supported by the CH1798, CH1799 and CH2056. Result codes 165 – 194 are only supported by the CH2056. To obtain a detailed status report for a given modem communication configuration, use the AT\V1 command. Executing this command at setup will cause the modem to connect and return a message on line consisting of <DTE speed> <modulation> <error protocol> <line speed of connection>. LEASED LINE OPTION The CH1799LL is a leased line version of the CH1799. Whereas the CH1799 requires an active voltage bearing or wet PSTN line for normal operations (typically, 48VDC onhook line voltage), the CH1799LL is designed to operate over a non-voltage bearing or dry line. The CH1799LL will only operate properly on a dry line. Damage will occur if used on a wet line. The CH1799LL does not support ring detect but does support off-hook control. Refer to Cermetek Application Note #116 for examples and instructions to establish a connection over a leased dry line wire pair. Note that the length of the leased line is limited to 20,000 feet. Use PSTN line protection as recommended in Figure 6B and in Cermetek Application Note # 126. Follow all applicable requirements for FCC Part 68 compliance. The User is responsible to ensure that FCC Part 68 compliance is maintained. As an alternative, the CH1799 will operate on a leased line if the line is made wet by application of a DC voltage. Refer to Cermetek Application Note #114. WARNING: Operation of the CH1799LL on a standard PSTN line will damage the CH1799LL and void its warranty. Further, operation of the CH1799LL on a dry line without using proper current limiting circuitry as outlined in Cermetek Application Note #126 may cause damage to the CH1799LL and will also void its warranty. Table 4. Pin Comparison of CH1786 and HS Modem Family. PIN CH1786 HS Modem FAMILY 1 RING RING 2 TIP TIP 3 RXA T1 4 TXA NC 5 SPK SPK 6 NC NC 7 NC NC 8 SLEEP OPEN* 9 NC NC 10 TXD TXD 11 RXD RXD 12 V/D OPEN* 13 DTR DTR 14 DSR DSR 15 RI RI 16 CTS (FX only) CTS 17 DCD DCD 18 HS NC* 19 Vcc Vcc 20 GND GND 21 RST RST 22 NC RST Notes: 1. * Indicates a difference between the CH1786 and the 2. 3. HS Modem. The HS Modem may be directly substituted for the CH1786 except in applications where pins 8, 12 or 18 are used. NC signifies Not Connected. Effective 31 March 2000, the HS Modem will no longer support the HS indication function. Therefore, pin 18 should be a No Connect in all applications. Pause During Dialing. When placing a call from an office with a telephone connected to a PBX, it may be necessary to dial an access code (usually the digit 9) to get an outside line. Inserting a comma in the telephone number commands the modem to pause for a specific length of time. The factory default pause time is 2 seconds. Example: Dial 9, pause, dial number. Enter: ATDT9, T1234567 AT COMMAND APPLICATIONS Dialing A Phone Number. The Dial command takes the form Dn, where n is a string of characters. In the simplest form, n will be only the digits of the phone number to be dialed. Example: Dial Number. Enter: AT D1234567 In response to this command, the HS Modem dials the telephone number “123-4567” and then waits for a carrier from the distant modem. If no carrier is detected within a given time (the default time is 30 seconds), the HS Modem automatically releases the line and sends a NO CARRIER result code. If a carrier is detected, the HS Modem gives a CONNECT result code and goes on-line, permitting communication with the distant modem. Multiple commas may be used for a greater delay time. Touch Tone and Pulse Dialing. The modem can use DTMF (touch-tones) “T,” or dial pulses “P” when dialing a telephone number. If the dial command does not specify which type to use, the modem defaults to the type last specified. The power-on default value is T. Example: Pulse dial 9, pause, touch-tone dial number Enter: ATDP9, T1234567 Redial Last Number. Use A/, the repeat command, to redial the last telephone number dialed when a busy signal is received. Example: Touch-tone dial 9, pause, dial number, return for command. Enter: ATDP9, T1234567; The Dial Command may also be issued without a telephone number. ATD causes the modem to pick up the telephone line without dialing a number. 2000 Cermetek Microelectronics, Inc. Page 7 Document No. 607-0003 Revision G (05/00) Figure 5. Schematic Illustrating Implementation of Voice Injection Feature. Table 5A Summary of Non-Extended Result Codes. Table 5B. CH1798/9 Extended Result Codes. Note: 1. An ”x” in a column indicates that the message (either the long form if verbose, or the value only for short form) will be generated when that particular value of ”n” (shown at the top of the column) has been selected by the use of ATXn. A numeral indicates which less explicit message (verbose or short form) will be output for that X option. 2000 Cermetek Microelectronics, Inc. Page 8 Document No. 607-0003 Revision G (05/00) Table 5C. CH2056 Extended Result Codes. 5. 6. 7. 8. 9. RJ-11C jack must be 0.1 inch spacing or greater to one another and 0.2 inch spacing or greater to all other traces. The traces should have a nominal width of 0.020 inches or greater. The RING and TIP PCB traces should be as short as possible and oriented to prevent coupling other high speed or high frequency signals present on the host circuit PCB. No additional circuitry other than that shown in Figure 7 may be connected between the modem module and the RJ-11C Jack. Doing so will invalidate the FCC approval. The HS Modem, the RJ-11 Jack, the interfacing circuitry and all PCB traces in between, must be contained on a PCB with a 94 V-0 flammability rating. The supplied FCC registration label must be applied visibly on the outside of the product. The product’s User Manual must provide the user with instructions for connection and use as recommended in the FCC Registration Section below. CANADIAN APPROVALS The HS Modem family is approveable for use by DOT to CSA CS-03 Part I. However, per Canadian procedures, approval can only be granted after the HS Modem has been installed into the end product. Typically, Canadian approval is obtained by submitting the final end product to an independent test house or consultant for evaluation. The test house/consultant then forwards the test results and applicable documents to the regulatory agency. Cermetek offers a list of consult-ants to assist with this process. HS MODEM HANDLING AND ASSEMBLY RECOMMEN-DATIONS The HS Modem contains static-sensitive components and should only be handled by personnel and in areas that are properly protected against static discharge. Return to Command State. The modem can be forced to reenter the command state after dialing (without hanging up) by ending the dial command with a semi-colon. This is useful when using the modem as an auto dialer. Automatic Answering. S0=0* DO NOT ANSWER TELEPHONE S0=1-254 ANSWER ON RING 1 TO RING 254 S0=255 ANSWER ON RING 255 *When S0 is set to 0, the modem will not auto-answer. PHONE LINE CONNECTION GUIDELINES 1. 2. 3. 4. The HS Modem must be mounted in the final assembly such that it is isolated from exposure to any hazardous voltages within the assembly. Adequate separation and restraint of cables and cords must be provided. The circuitry from the HS Modem to the telephone line interface must be provided in wiring that carries no other circuitry other than that specifically allowed in the FCC rules (such as A and A1 leads). Connection to phone line should be made through an RJ11C jack. PCB traces from the modem’s RING and TIP pins to the 2000 Cermetek Microelectronics, Inc. There are two mounting techniques that are recommended for physically connecting the HS Modem to a PCB: 1. Direct soldering 2. Sockets. Direct Soldering. The HS Modem may be wave soldered onto a circuit card. All HS Modem products are hermetically sealed and will not be harmed by industry standard wave soldering processes. Socketing. The socketing approach to mounting eliminates cleaning and desoldering concerns. When the socket is used, it must make a solid connection to all pins. Failure to do so will cause unreliable or intermittent operation. Also, steps should be taken to assure that the module remains tightly seated in the socket after the end product is shipped. Cermetek recommends socket CES-150-01-T-S by Samtec, 50 pin strip socket. FCC REGISTRATION All products in the HS Modem family are registered with the FCC (except the CH1799LL) under Part 68. To maintain the validity of the registration, you must serve notice to the end user of the product of several restrictions the FCC places on the modem and its use. Page 9 Document No. 607-0003 Revision G (05/00) COMMAND A/ A B0 B1 C1 Dn E0 E1 H0 H1 L0 L1 L2 L3 M0 M1 M2 M3 N0 N1 O0 O1 Q0 Q1 Sn Sn? Sn=v V0 V1 W0 W1 W2 Table 6A. Summary of Basic AT Commands. FUNCTION COMMAND FUNCTION Re-execute command Go off-hook and attempt to answer call Select V.22 connection at 1200bps Select Bell 212A connection at 1200bps Return OK message Dial modifier P Pulse Dial T Touch Tone Dial W Wait for Dial Tone ; Return to Idle State @ Wait for Quiet Answer Command ! Flash Hook , Pause 0-9/ABCD Dial Digits/ Characters & wait for credit card dial tone ∧ Toggles calling tone L Redial last number * Star digit – tone dialing S=n Dial the number and store in directory. N 0 to 3. Turn off command echo Turn on command echo Initiate a hang-up sequence If on-hook, go off-hook and enter command mode Set low speaker volume Set low speaker volume Set medium speaker volume Set high speaker volume Turn Speaker off Turn speaker on during hand shaking and turn speaker off while receiving carrier Turn speaker on during hand shaking and while receiving carrier Turn speaker off during dialing and receiving carrier and turn speaker on during answering X0 X1 X2 X3 X4 Y0 Y1 Z0 Z1 &C0 &C1 &D0 &D1 &D2 &/D3 Report basic call progress result codes, i.e. OK, CONNECT< RING, NO CARRIER (also for busy, if enabled, and dial tone not detected), NO ANSWER and ERROR Report basic call progress result codes, i.e. OK, CONNECT< RING, NO CARRIER (also for busy, if enabled, and dial tone not detected), NO ANSWER and ERROR Report basic call progress result codes, i.e. OK, CONNECT< RING, NO CARRIER (also for busy, if enabled, and dial tone not detected), NO ANSWER and ERROR Report basic call progress result codes, i.e. OK, CONNECT< RING, NO CARRIER (also for busy, if enabled, and dial tone not detected), NO ANSWER and ERROR Report basic call progress result codes, i.e. OK, CONNECT< RING, NO CARRIER (also for busy, if enabled, and dial tone not detected), NO ANSWER and ERROR Disable long space disconnect before on-hook Enable long space disconnect before on-hook Restore stored profile 0 after warm reset Restore stored profile 1 after warm reset Force RLSD active regardless of the carrier state Allow RLSD to follow the carrier state Interpret DTR On to OFF transition per & Qn: &Q0, &Q5, &Q7 The modem ignores DTR Interpret DTR On to OFF transition per & Qn: &Q0, &Q5, &Q6 Interpret DTR On to OFF transition per & Qn: &Q0, &Q5, &Q6 Interpret DTR On to OFF transition per & Qn: &Q0, &Q5, &Q6 The modem performs soft reset. Turn off auto-mode detection Turn on auto-mode detection Go on-line Go on-line and initiate a retrain sequence Allow result codes to DTE Inhibit result codes to DTE Select S-Register as default Return the value of S-Register n Set default S-Register to value v Report short form (terse) result codes Report long form (verbose) result codes Report DTE speed in EC model Report line speed, EC protocol and DTE speed Report DCE speed in EC mode 2000 Cermetek Microelectronics, Inc. Page 10 Document No. 607-0003 Revision G (05/00) COMMAND &F0 &F1 &G0 &G1 &G2 &K0 &K3 &K4 &K5 &K6 Kn \K0,2,4 \K1 \K3 \K5 \K0,1 \K2,3 \K4,5 \K0,1 \K2,3 \K4,5 \N0 \N1 \N2 \N3 \N4 \N5 \V0 \V1 +MS %C0 %C1 %C2 %C3 \A0 \A1 \A2 \A3 \Bn &M0 &P0 Table 6B. Summary of Basic AT Commands (Continued). FUNCTION COMMAND FUNCTION Restore factory configuration 0 Restore factory configuration 1 Disable guard tone Disable guard tone Enable 1800 Hz guard tone Disable DTE/ DCE flow control Enable RTS/ CTS DTE/DCE flow control Enable XON/XOFF DTE/DCE flow control Enable transparent XON/XOFF flow control Enable both RTS/CTS and XON/XOFF flow control CONTROLS BREAK HANDLING DURING THREE STATES When modem receives a break from the DTE: Enter on-line command mode, no break sent to the remote modem Clear buffers and send break to remote modem Send break to remote modem immediately Send break to remote modem in sequence with transmitted data When modem receives \b in on-line command state: Clear buffers and send break to remote modem Send break to remote modem Send break to remote modem in sequence with transmitted data &P1 &P2 &P3 &Q0 &Q5 &Q6 &T0 &T1 &T2 &T3 &T4 &T5 &T6 &T7 &T8 &V &W0 &W1 &Y0 &Y1 &Zn=x %E0 %E1 %E2 Set 10 pps pulse dial with 33%/67% make/break Set 20 pps pulse dial with 39%/61% make/break Set 20 pps pulse dial with 33%/ 67% make/ break Select direct asynchronous mode Modem negotiates an error corrected link Select asynchronous operation in normal mode Terminate any test in progress Initiate local analog loopback Return ERROR result code Initiate local digital loopback Allow remote digital loopback Disallow remote digital loopback request Request an RDL without self-test Request an RDL with self-test Initiate local analog loop with self-test Display current configurations Store the active profile in NVRAM profile 0 Store the active profile in NVRAM profile 1 Recall stored profile 0 upon power up Recall stored profile 1 upon power up Store dial string x (to 34) to location n (0-3) Disable line quality monitor and auto retrain Enable line quality monitor and auto retrain Enable line quality monitor and fallback When modem receives break from remote modem: Clear data buffers and send break to DTE Send a break immediately to DTE Send a break with received data to DTE Select normal speed buffered mode Select direct mode elect reliable link mode Select auto reliable mode Force LAPM mode Force MNP mode Connect messages are controlled by the command settings X, W, and S95 Connect messages are displayed in the single line format Select modulation ERROR CORRECTING COMMANDS Disable data compression Enable MNP 5 data compression Enable V.42bis data compression Enable both V.42.bis and MNP5 compression Set maximum block size in MNP to 64 Set maximum block size in MNP to 128 Set maximum block size in MNP to 192 Set maximum block size in MNP to 256 Send break of n x 100 ms Select direct asynchronous mode Set 10 pps pulse dial with 39%/61% make/ break 2000 Cermetek Microelectronics, Inc. MNP10 COMMANDS -K0 Disable MNP 10 extended services -K1 Disable MNP 10 extended services -K2 Disable MNP 10 extended services FAX CLASS 1 +FCLASS=n +FAE=n +FRH=n +FRM=n +FRS=n +FTH=n +FTM=n +FTS=n Page 11 Service Class Data/fax auto answer Receive data with HDLC framing Receive data Receive silence Transmit data with HDLC framing Transmit data Stop transmission and wait Document No. 607-0003 Revision G (05/00) Table 7. S-Register Summary. Register S0 S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14 S15 S16 S17 S18 S21 S22 S23 S24 S25 Function Rings to Auto-Answer Ring Counter Escape Character Carriage Return Character Line Feed Character Backspace Character Wait Time for Dial Tone Wait Time for Carrier Pause Time for Dial Delay Modifier Carrier Detect Response Time Carrier Loss Disconnect Time DTMF Tone Duration Escape Prompt Delay Reserved General Bit Mapped Options Status Reserved Test Mode Bit Mapped Options Status (&T) Reserved Test Timer V.24/General Bit Mapped Options Status Speaker/Results Bit Mapped Options Status General Bit Mapped Options Status Reserved Delay to DTR Off Range 0-255 0-255 0-255 0-127 0-127 0-255 2-255 1-255 0-255 1-255 1-255 50-255 0-255 ----------0-255 --------0-255 S26 S27 S28 S30 S31 S32 S33 S34-S35 S36 S37 S38 S39 S40 S41 S42-S45 S46 S48 S82 S86 S95 RTS-to-CTS Delay General Bit Mapped Options Status General Bit Mapped Options Status Disconnect Inactivity Timer General Bit Mapped Options Status XON Character XOFF Character Reserved LAPM Failure control Line Connection Speed Delay before Forced Hang up Flow Control bit Mapped Options Status General Bit Mapped Options Status General Bit Mapped Options Status Reserved Data Compression Control V.42 Negotiation Control LAPM Break Control Call Failure Reason Code Result Code Messages Control 0-255 ----0-255 --0-255 0-255 ------0-255 --------------0-255 --- 2000 Cermetek Microelectronics, Inc. Page 12 Units Rings Rings ASCII ASCII ASCII ASCII seconds seconds seconds 0.1seconds 0.1seconds 0.001sec 0.02sec ----------seconds --------seconds or 0.01second 0.01second ----10 seconds --ASC11 ASC11 ------seconds ------------------- Saved * * * * * * * ----------* ----------- Default 0 0 43 13 10 8 2 50 2 6 14 95 50 --138 (8Ah) --0 --0 52 (34h) 117 (75h) 62 (3Dh) --5 ------------- 1 73 0 0 94 17 19 * * 7 0 20 3 104 (68h) 195 (C3h) --138 7 128 (40h) --0 * * * * * * (49h) (C2h) (11h) (13h) --- Document No. 607-0003 Revision G (05/00) In addition to restriction notification, the FCC requires that Cermetek make all repairs to all products in the HS Modem family. If repairs are necessary after installation of the HS Modem and the end product has been delivered to the end user, the end product must be returned to the end product supplier where the HS Modem can be removed and then forwarded to Cermetek repair. The following notice is recommended and should be included in the end product’s user manual. complaint with the FCC. Contact your local telephone service provider if you have any questions about your phone line. FOR YOUR USER’S MANUAL DEFAULT STATUS, PERFORMANCE AND SPECS The part 68 rules require the following (or equivalent) be provided to the end user of the equipment containing a DAA: Prior to delivery , Cermetek installs into each HS Modem the following the Default Configuration Profile: Type of Service: The (insert end product name) is designed to be used on standard device telephone lines. It connects to the telephone line by means of a standard jack called the USOC RJ-11C (or USOC RJ45S). Connection to telephone-company-provided coin service (central office implemented systems) is prohibited. Connection to party lines service is subject to state tariffs. Changes in Attestation Procedure for Plugs and Jacks: (Name of applicant) attests that the network interface plugs or jacks used on this equipment comply with and will continue to comply with the mechanical requirements specified in Part 68, Sub-part F, specifically the dimensions, tolerances and metallic plating requirements. The compliance of these connectors will be assured by purchase specifications and incoming inspection. Documentation of such specifications and/or inspections will be provided by the FCC within 30 days of their request for the same. Telephone Company Procedure: The goal of the telephone company is to provide you with the best service it can. In order to do this, it may occasionally be necessary for them to make changes in their equipment, operations or procedures. If these changes might effect your service or the operation of your equipment, the telephone company will give you notice, in writing, to allow you to make any changes necessary to maintain uninterrupted service. In certain circumstances, it may be necessary for the telephone company to request information from you concerning the equipment which you have connected to your telephone line. Upon request of the telephone company, provide the FCC registration number and the ringer equivalence number (REN); both of these items are listed on the equipment label. The sum of all of the REN’s on your telephone lines should be less than five in order to assure proper service from the telephone company. In some cases, a sum of five may not be useable on a given line. Consult your telephone provider. If Problems Arise: If any of your telephone equipment is not operating properly, you should immediately remove it from your telephone line, as it may cause harm to the telephone network. If the telephone company notes a problem, they may temporarily discontinue service. When practical, they will notify you in advance of this disconnection. If advance notice is not feasible, you will be notified as soon as possible. When you are notified, you will be given the opportunity to correct the problem and informed of your right to a file a 2000 Cermetek Microelectronics, Inc. In the event repairs are ever needed on the (insert your product name), they should be performed by (insert your company name) or an authorized representative of (insert your company name). For information contact: (insert your company address). Default Connect Speeds are 14,400bps, 28,800bps, 33,600bps and 56,000bps for CH1794, CH1798, CH1799 and CH2056 respectively Serial port data rate auto baud enabled Bell 212A operation at 1200bps Parity - none Auto answer disabled Command echo ON All result codes enabled – except \REL codes Wait for dial tone before dialing – 2 seconds Dials with touch-tone (T) Detects busy signal (ATX4) Full word result codes - non-extended Pulse dial make/break ratio = 39/61- 10 pps Test timer set to 0 seconds, test modes disabled Inactivity timer set to 0 minutes CTS always active DSR is ignored DCD is ignored RTS to CTS delay - .01 seconds DTR always active - hangs up after transition Long space disconnect disabled Speaker enabled but off when receiving carrier Speaker volume set to low Local modem will not grant RDL request from remote modem Guard tones disabled Minimum DTR pulse width = .05 seconds Ring count – 00 Escape code character = 43 (+) Flash to on hook = 70 ms Auto speed detection enabled DTE connect speed, connect messages Back space character = 08 (BS)Carriage return character = 13 (CR) Line feed character = 10 (LF) Duration of wait for dial tone = 2 seconds Duration of wait for carrier after dialing = 50 seconds Carrier detect response time = 0.6 seconds Escape code guard time = 1 second Length of use after comma = 2.0 seconds Last carrier to hang up delay = 1.4 seconds DTMF interdigit delay = .095 seconds Auto sync address or address detection = 0 Connection detected at DTE – Highest speed 38,400bps Auto retrain enabled - 30 seconds attempt MNP error correction mode can be negotiated (&Q5) MNP - non-extended service selected MNP error correction block size is 128 characters selected Data compression -negotiation enabled Transmit break length is 0.3 seconds All breaks are transmitted in sequence with data Serial port flow control enabled = RTS/CTS XON/XOFF flow control characters selected NOTE: Upon power-up the HS Modem will recall user profile 0 which may override some of the above Factory Defaults. If desired the user may, at their option, save the factory defaults in user profile 0. Page 13 Document No. 607-0003 Revision G (05/00) Figure 6A. PSTN Line Interface for all HS Modems except CH1799LL. Figure 6B. PSTN Line Interface for CH1799LL only. 2000 Cermetek Microelectronics, Inc. Page 14 Document No. 607-0003 Revision G (05/00) Table 8. HS Modem Electrical Specifications. Table 9. HS Modem Electrical Specifications. 2000 Cermetek Microelectronics, Inc. Page 15 Document No. 607-0003 Revision G (05/00) Table 10. Analog Characteristics. Name Type SPK O(DF) Characteristic Value Minimum Load Maximum Capacitive Load Output Impedance Output Voltage D.C. Offset 300Ω 0.01µ 10Ω 2.5 + 1.6V <20mV Table 11. Summary HS Modem Family of Products. Model Summary of Features Operating Temperature CH1794 CH1794ET Full Function, 14.4kbps, FCC Part 68 Approved, UL1950 Listed Full Function, 14.4kbps, FCC Part 68 Approved, UL1950 Listed 0° C to +70°C -40° C to +85°C CH1798 CH1798ET Full Function, 28.8kbps, FCC Part 68 Approved, UL1950 Listed Full Function, 28.8kbps, FCC Part 68 Approved, UL1950 Listed 0° C to +70°C -40° C to +85°C CH1799 CH1799ET CH1799LL Full Function, 33.6kbps, FCC Part 68 Approved, UL1950 Listed Full Function, 33.6kbps, FCC Part 68 Approved, UL1950 Listed Full Function, 33.6kbps, Leased Line, FCC Part 68 Approved 0° C to +70°C -40° C to +85°C 0° C to 70°C CH2056 CH2056ET Full Function, 56.0kbps, FCC Part 68 Approved, UL1950 Listed Full Function, 56.0kbps, FCC Part 68 Approved, UL1950 Listed 0° C to +70°C -40° C to +85°C Figure 7. Physical Dimensions and Pin Functions. Cermetek reserves the right to make changes in specifications at any time and without notice. The information furnished by Cermetek in this publication is believed to be accurate and reliable. However, no responsibility is assumed by Cermetek for its use, or for any infringements of patents or other rights of third parties resulting from its use. No license is granted under any patents or patent rights of Cermetek. Printed in U.S.A 406 TASMAN DRIVE | SUNNYVALE CA 94089 | LOCAL: 408-752-5000 | TOLL FREE: 1-800-882-6271 | FAX: 408-752-5004 WEB SITE: http://www.cermetek.com | EMAIL: [email protected] 2000 Cermetek Microelectronics, Inc. Page 16 Document No. 607-0003 Revision G (05/00)