Application Fact Sheet
Freescale Semiconductor, Inc.
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• Scalable implementation
of high-performance and
high density voice/data
capabilities, from 2000 to
8000 voice channels at
G.711, for a wide range of
• Single “platform”
architecture for both IPbased and ATM oriented
systems, including
interworking between
• True, fine-grained,
multiservice support for
high numbers of users
• Simplified line card
design with lower power
and board real estate
plus ability to leverage
single-vendor solution
With the growth in data network traffic driving major
changes in public networks, the convergence of existing
voice traffic onto the data network infrastructure promises significant benefits (such as reduced costs and simplified network management) for carriers and
enterprises alike. Media gateways and switches that
support the integration of Voice over Internet Protocol
(VoIP), legacy public switched telephone network (PSTN),
and ATM networks make this convergence possible.
Media gateway functions are being implemented in
standalone devices, or as modules in multi-service
switches, edge routers, remote access concentrators,
or PSTN switches. In all cases, media gateways in share
common hardware and software design challenges.
Media gateway implementations are complicated by the
wide variety of technologies that make up existing networks. These include the circuit-switched PSTN, ATM
and Frame Relay based public data networks, and the IPbased Internet, all of which may be carried over the
same SONET transport network.
Functions required of media gateways typically include
the conversion (and compression) of Time-DivisionMultiplexed (TDM) voice circuits onto ATM networks
using a variety of adaptation protocols (AAL-0, AAL-1,
AAL-2 and AAL-5), or onto packet-based networks using
IP (including RTP), Frame Relay, or extensions of both.
Voice switches that support the switching of voice circuits among the various network interfaces may require
interworking between different protocols (such as
between ATM and IP-based networks) as well.
The specific design challenges for media gateways
• Accommodating increasing numbers of voice (or fax
and modem) circuits per slot within a specific networking device.
• Supporting the increasing number of different network interfaces and speeds required, ranging from
channelized T1/E1 lines through OC-12 SONET and
Gigabit Ethernet interfaces.
• Adapting to the number of different protocols used
(such as ATM AAL-2/AAL-5, VoIP/RTP, Packet-overSONET/PPP, MPLS, and so on), even as the protocol
standards evolve and improve.
• Managing Quality of Service (QoS) to ensure prioritization of latency-sensitive traffic, such as voice.
• Providing the flexibility to add new features and
functions through software as market demands
dictate in the future.
Motorola® offers complete solutions for all aspects of
media gateway and switch implementations. This
includes the StarCore® Digital Signal Processors (DSPs)
required to convert and compress TDM voice circuits into
packet or cell-based flows, the C-Port™ network processors (NPs) required to terminate or switch the packet or
cell-based circuits, and the PowerPC® host processors
required to implement the control functions that manage
each voice connection. The network processing function
is the focus of this Application Fact Sheet.
Motorola’s C-Port family, including network processors,
traffic management coprocessors, and interface adaptors, provides the flexibility to support the wide range of
protocols required for today’s media gateway implementations. The internal processing resources of the C-3e NP
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Media gateway solution
for running voice over
IP and ATM networks
using multiple Motorola
networking silicon
technologies including
network processors,
traffic management
coprocessors, DSPs,
and host processors
are particularly well suited to be used at the “uplink”
aggregation level in media gateway designs, where
extensive protocol conversion and switching functions
are required.
The figure illustrates a VoIP/VoATM network and details
the tasks handled by the NP. On one side of the gateway,
TDM traffic converted and compressed by Motorola
DSPs is aggregated on to high density line cards (capable
of supporting 2000 voice channels per line card with the
C-3e NP, and over 8000 with the C-5e NP) and then
passed on to an internal Ethernet bus (or other media).
These newly created packets are forwarded to the C-3e
NP, which formats the voice packets into the desired network protocol, which may include IP and ATM. With IP,
the voice packet is formatted into a specific VoIP protocol
(such as RTP), possibly tagged as part of an MPLS session, and forwarded onto an IP-based network (over
Ethernet or SONET), where QoS may be guaranteed
through the use of various protocols including DiffServ.
ATM is suitable for carrying voice because of its built-in
QoS features. Options for ATM processing in media
gateways might include VoIP over AAL-5 over ATM,
where voice packets from the DSPs are formatted into a
specific VoIP protocol (such as RTP), which are then converted into AAL-5 PDUs, and segmented into ATM cells.
Alternatively, voice packets may be formatted into ATM
AAL-2 “mini-packets”, one or more of which are encapsulated into ATM cells.
Interworking between IP and ATM, such as switching
within and between RTP and AAL-2 flows, can be
achieved easily with the C-Port network processor
Fine grained QoS capabilities can also be added using
Motorola’s traffic management coprocessors (TMCs).
These TMCs are multi-protocol and can thus provide traffic policing, shaping, monitoring, and scheduling for both
ATM and IP traffic, even simultaneously. They ensure
that voice traffic is accorded the correct priority and that
users receive toll-quality service.
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The flexibility and performance of the C-Port family
allows a variety of media gateway applications to be
created all based on a common software base. Applications are written in C-language using Applications
Programming Interfaces (APIs), which enables you to
easily upgrade functionality and scale software to higher
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The C-Port family development environment consists of
the following components:
• C-Ware™ Applications Library (CAL) —
Comprehensive set of reference applications for
building networking systems based on Motorola’s
C-Port family, The CAL significantly accelerates
customer software development by providing
extensive reference source code that is instrumented
for and tested with the CST.
• C-Ware Software Toolset (CST) — Functional and
performance accurate simulation environment,
standard GNU-based compiler and debugger, GUI
performance analysis tool, traffic scripting tools, and
comprehensive C-Ware APIs.
• C-Ware Development System (CDS) — Compact
PCI chassis with Motorola MPC750 Host Application
Module, which can also include NP Switch Modules,
TMC Daughter Cards, and various Physical Interface
Modules (PIMS). Complete hardware reference
designs also available.
Vendors may also select Wind River® Tornado® for
Managed Switches (TMS) to program the host
processor/control plane software. Motorola has established an alliance with Wind River to provide integration
of the C-Port network processors with TMS 2.0 supporting both Layer 2 and Layer 3 services. In addition, the
Host Application Module in the CDS runs VxWorks® on
the MPC750.
Network Processors
& Traffic Managers
Digital Signal
C-3e NP
5.5 W @ 180 MHz
C-5e NP
9 W @ 266 MHz
5Gbps throughput
DSP Farm
C-Ware Software
Web site download of current CST
release (Windows or UNIX)
C-Ware Development
CDS Base Unit (Chassis, Power Supply,
Single Board Computer)
* The CST can be downloaded from
† Ask your sales representative or distributor for details and availability of system modules, which you
order separately.
For high-performance security
Tel: 480-648-2300
[email protected]
For advanced classification
Tel: 613-724-6004
Fax: 613-724-6008
Wind River Systems
For Tornado for Managed Switches
and RTOS
Tel: 800-545-9463
Fax: 510-814-2010
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For inquiries about Motorola products, please contact the Motorola Customer Care
Center at 800-521-6247, or visit us online at
© 2003 Motorola. C-3e, C-5, C-5e, C-Port, Q-5, M-5, and C-Ware are all trademarks of Motorola Inc. Motorola and the
stylized Motorola logo are registered trademarks of Motorola Inc. All other products or service names are the
property of their owners.
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02, March 2003 On This Product,
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