8 X 16 Full Blocking Switch Matrix Design Concept

Aeroflex / Weinschel Subsystems
8 X 16 Switch Matrix
Design Concept
28 July 2004
Prepared by:
5305 Spectrum Drive, Frederick, MD 21703
301-846-9222 ● Fax: 301-846-9116 ● www.aeroflex-weinschel.com
© COPYRIGHT 2004 Aeroflex / Weinschel Inc.
All Rights Reserved.
Aeroflex / Weinschel, Inc.
1
TABLE OF CONTENTS
1
INTRODUCTION ........................................................................................................................ 3
2 SCOPE.......................................................................................................................................... 3
3 GENERAL SPECIFICATIONS................................................................................................... 4
3-1
3-2
3-3
3-4
3-5
3-6
RF SPECIFICATIONS ............................................................................................................. 4
DESIGN ................................................................................................................................ 5
INTERCONNECTIONS ............................................................................................................. 6
ETHERNET SNMP SPECIFICATIONS...................................................................................... 9
CERTIFICATION .................................................................................................................... 9
QUALITY ASSURANCE .......................................................................................................... 9
4
WARRANTY ............................................................................................................................... 9
5
AVAILABILITY.......................................................................................................................... 9
INTELLECTUAL PROPERTY NOTICE
The design concepts presented in this paper are offered for consideration in
developing specific solutions for our customers, and remain the exclusive property
of Aeroflex / Weinschel. Any unauthorized copying, distribution, or conversion
of the contents of this paper for other purposes without the prior written consent of
Aeroflex / Weinschel is strictly prohibited.
Aeroflex / Weinschel, Inc.
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1 Introduction
Aeroflex / Weinschel is pleased to present this technical paper describing an 8 x 16 Switch Matrix.
Designs of this type are intended for use as a remote controllable RF patch panel. Weinschel
develops and manufactures high-quality, high-reliability microwave and RF components and
Subsystems. Aeroflex / Weinschel has over 25 years of product development experience in satellite
and communications systems, test, measurement and simulation of wireless systems, including 3G,
WCDMA, PCS, and GSM; cable modem test sets and precision microwave and RF instrumentation.
Aeroflex / Weinschel is well positioned to deliver designs based upon this 8 x 16 Switch Matrix.
The Switch Matrix is a modular design, allowing the end customer to configure either 8 x 8 or 8 x 16
configurations with only minor factory, board level modifications. The basic design uses latching
relays so that the signal path integrity can be maintained even during power outages or loss of
Ethernet control. The switch matrix can be delivered either as a 50 Ohm or 75 Ohm system.
Aeroflex / Weinschel invites customer inquiries based upon this conceptual design, and offers a wide
range of design flexibility to address specific customer needs.
2 Scope
Aeroflex / Weinschel’s design approach uses a highly adaptable platform that allows a dense
integration of switches. The switch matrix chassis contains sixteen, 8x1 switch modules and eight,
16x1 modules. Once a system is fielded it can be maintained through the exchange of front and rear
panel switches, the Ethernet controller and power modules. The Switch Matrix System software can
be controlled through a 10 Base T TCP/IP software link. Field level software upgrades or
maintenance will be available through a TCP/IP link.
Aeroflex / Weinschel, Inc.
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3 General Specifications
3-1
RF Specifications:
Specifications:
Standard
Goal
Switch
Frequency:
Configuration:
Impedance:
Insertion Loss:
RF Input Power:
Isolation:
RF connector:
Electromechanical
DC-2200MHz
8x16 blocking matrix
50 ohm**
4 dB
30 dBm
45 dB
TNC Female***
8 Connector Front,
16 Connector Back
Size:
VSWR:
Control:
10.5 h x 19 w x 20 d
1.6
Ethernet SNMP
Electromechanical
DC-2200MHz
8x16 blocking matrix
50 ohm**
2.2-2.8 dB
30 dBm
45-60 dB
TNC Female***
8 Connector Front,
16 Connector Front or
Back
10.5 h x 19 w x 20 d
1.4
Ethernet SNMP
** Please call for details on the 75 Ohm version of this subsystem.
*** Alternate RF connectors available.
Aeroflex / Weinschel, Inc.
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3-2
Design
The design will be an interface of sixteen, 1x 8 switches (Figure 3) and eight, 1x16 switches (Figure
2). The multi-throw switch design will be based on the use of signal relays. The 1 x 8 switch is
shown in Figure 1.
Figure 1. 1 X 8 switch Implementation with 8 Relays
The signal trace forms a tee to connect to the final two output relays. This is to eliminate one layer of
switching, improving the insertion loss and reducing the cost. The 1 x 16 switch will also employ
this feature, therefore 16 relays will be needed to implement the design.
Total relays
8 – 1 x 16 switches, 8 x 16 = 128
16 – 1 x 8 switches, 16 x 8 = 128
256
Aeroflex / Weinschel, Inc.
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3-3
Interconnections
The sixteen, 1 x 8 switches will mate with the eight, 1x 16 switches. This requires 128 interconnects.
The 1 x 8 cards slide in the front of the 10.5” positioned vertically, and the 1 x 16 cards slide in the
rear of the 10.5” rack positioned horizontally. (Figure 5) This interface, (Figure 4) is made by a
Blind mate connector.
1 x 16 switch card
REAR VIEW
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Blind mate connector?
FRONT VIEW
Control interface connector
TNC female connector
Figure 2. 1 x 16 Switch Card
Aeroflex / Weinschel, Inc.
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1 x 8 switch card
Control interface connector
A
B
C
D
E
F
G
TNC female connector
H
REAR VIEW
FRONT VIEW
Figure 3. 1 x 8 Switch Card
1
A
2
A
1
B
2
B
1
C
1
2
1
F
2
F
1
G
3
2
4
3
5
4
5
G
4
H
8
7
6
9
8
9
G
8
H
9
H
10
10
11
A
11
B
11
12
A
12
B
12
13
A
13
B
13
14
A
14
B
14
15
A
15
B
15
16
A
16
B
16
C
C
C
C
C
C
C
10
D
11
D
12
D
13
D
14
D
15
D
16
D
10
E
F
G
7
H
9
E
F
G
H
8
7
6
9
D
E
F
G
5
H
7
6
9
8
10
A
B
C
D
E
F
8
7
6
9
B
C
D
E
F
G
3
H
5
8
7
6
9
A
B
C
D
E
F
G
2
H
4
7
6
5
8
A
B
C
D
E
F
G
1
H
3
6
5
4
7
A
B
C
D
E
5
4
3
6
A
B
C
D
E
4
3
2
5
A
B
C
D
E
3
2
1
4
A
B
C
D
3
A
10
11
E
11
12
E
12
13
E
13
14
E
14
15
E
15
16
E
16
F
F
F
F
F
F
F
10
G
11
G
12
G
13
G
14
G
15
G
16
G
10
H
11
H
12
H
13
H
14
H
15
H
16
H
View of interconnects in center of box
Figure 4. Interface Plane for Method 1
Aeroflex / Weinschel, Inc.
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Possible cable
Or PCB
transmission line
1”
TNC connector
1 x 8 cards vertical, 16 units
Relay switches
Interface plane
1 x 16 cards horizontal, stacked 8 high
TOP VIEW
Figure 5. Top View -- Method 1
Aeroflex / Weinschel, Inc.
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3-4
Ethernet SNMP Specifications
The switch matrix will have a 10 Base T Ethernet Interface with an RJ45 Connector. The interface
will comply with SNMP protocol. The parameters, which will be controllable or accessible over the
control interface, will be:
1.
2.
3.
4.
5.
6.
7.
8.
9.
3-5
System S/N
System board S/N’s
SW Revision level
Individual switch positions
Inquiry of switch position
System Fault Reports
System Address status
System address set
Download new software revision
Certification
The 8x16 switch matrix will have a CE certification.
3-6
Quality Assurance
Aeroflex / Weinschel will implement its standard quality assurance program for development,
fabrication, assembly, alignment and test of the deliverable items. This program supports compliance
with the inspection requirements of ISO 9001.
4 Warranty
Aeroflex / Weinschel supplies a one year warranty on all proprietary equipment. All units under
warranty that need repair will be repaired at the Frederick Maryland facility.
5 AVAILABILITY
This paper describes both a Weinschel capability and a specific conceptual design for an 8 x 16
Switch Matrix, but not an existing product. Product availability and delivery will be dependant upon
specific customer requirements and quantities required.
Aeroflex / Weinschel has earned a reputation in the industry as a responsive supplier of both
electronic components and subsystems. We invite your specific inquiries, and will work with your
designers and requirements to formulate a subsystem approach that is both compliant with your
technical needs, and timely with regard to your development schedule.
Aeroflex / Weinschel, Inc.
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