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Cisco MGX 8880 Media Gateways

Cisco Voice Switch Service Module

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The Cisco® Voice Switch Service Module (VXSM) is a high-density voice module for the Cisco MGX® 8880 Media Gateway and Cisco MGX 8000 Series Multiservice Switches. The Cisco VXSM offers high availability, scalable and robust voice features for wireless, wireline, and cable applications.

Product Overview

The Cisco VXSM is a high-density voice service module with time-division multiplexing (TDM) interfaces ranging from T1/E1 to channelized OC-3/STM-1 (refer to Figure 1). It provides service providers with carrier-class capabilities for high capacity and reliability for voice-over-IP (VoIP) services. The Cisco VXSM scales to 8064 DS0s per module and is fully redundant to maintain active calls upon switchover.
The Cisco VXSM architecture combines a high-performance voice services engine with onboard digital signal processors to provide advanced voice processing and features that allow quick development and deployment of VoIP services. The Cisco VXSM offers carrier-grade voice quality with a full suite of voice, modem, and fax features. The Cisco VXSM, together with a softswitch, provides maximum deployment flexibility for various packet voice networks based on the Media Gateway Control Protocol (MGCP), PacketCable™ Trunking Gateway Control Protocol (TGCP), H.248, H.323, and Session Initiation Protocol (SIP).
The innovative Cisco VXSM architecture provides investment protection with its ability to easily add new functions and services through software upgrades.

Figure 1. Cisco VXSM (Front and Back Cards)

Features and Benefits

Table 1 Describes features and benefits, Table 2 provides an overview of the features, and Table 3 provides specifications of the Cisco VXSM.

Table 1. Features and Benefits of Cisco VXSM

Feature

Benefit

High density

• Scales up to 8064 VoIP DS0s per service module
• Lowers capital expenditures (CapEx) and operating expenses (OpEx) by maximizing density per platform
• Allows 40,320 VoIP DS0s per chassis and 120,960 VoIP DS0s per rack, with echo cancellation

TDM interfaces

• Offers scalable optical interfaces; available with 2- or 4-port OC-3/STM-1 interfaces per service module
• Provides scalable electrical interfaces; up to 6 port T3 and 48 port T1/E1 interfaces per service module

High availability

• Helps ensure carrier-class reliability by providing active call preservation

Integrated nonblocking architecture

• Lowers entry, scaling, and operations cost by integrating TDM, network processing, and digital-signal-processor (DSP) technology onto a single module

Table 2. Overview of Cisco VXSM Features

Features

Description

Call control

• H.248 (over UDP, TCP, and SCTP)
• MGCP (over UDP)
• TGCP (over UDP)
• H.323, SIP (enabled via a softswitch proxy)

Signaling interfaces

• Inter-Machine Trunk (IMT)
• Signaling ISDN Primary Rate Interface (PRI) over RUDP and IUA
• Signaling System 7 (SS7) over M3UA
• DPNSS/DASS over DUA
• Channel Associated Signaling (CAS) for E911(FGD, CAMA) and BLV/OI

Voice compression

• G.711, G.723.1(a), G.726, G.729a(b), AMR, GSM-EFR, iLBC, Clear Channel

Voice features

• G.165, G.168-2004 integrated, nonblocking echo cancellation; programmable up to 128 ms
• Transparent Transcoding between a-law and µ-law encoding
• Voice Activity Detection, Silence Suppression, and Comfort Noise Generation
• Fixed and Adaptive Jitter Buffering
• Call Progres tone generation: dial, busy, ring back, and congestion tones among others with local country variants; programmable tones
• Dual Tone Multi Frequency (DTMF) relay (RFC 2833/4733), generation and detection
• Voice Quality Monitoring (RTCP-XR/H.248.30)
• Transcoding for voice bearer properties including supported Codecs, Packetization Period, Voice Activity Detection
• IP-IP Interworking for DTMF

Modem and Fax

• Fax and modem pass-through
• T.38 Fax Relay (Call Agent and Media Gateway controlled)
• TTY/TDD

IP

• Real-time Transport Protocol (RTP) (RFC 3550), DTMF Relay (RFC 2833/4733), MPLS

ATM

• Standards-based ATM Adaptation Layer 2 (AAL2) and ATM Adaptation Layer 5

Announcements

• Onboard announcement storage and playout

Lawful intercept

• Lawful intercept framework enabling carriers to meet local legal intercept requirements (e.g. Communications Assistance for Law Enforcement Act [CALEA]: PacketCable, Service Independent Intercept)
• Support for call content
• Bearer encryption

Packet Cable

• PacketCable 1.1 Compliance
• PacketCable bearer encryption
• IPSec signaling encryption

Management interfaces

• Simple Network Management Protocol version 3 (SNMPv3)
• Command Line Interface (CLI)
• Telnet
• Secure Shell (SSH) Protocol
• FTP
• Secure FTP

Table 3. Product Specifications

Features

Description

Chassis compatibility

• Cisco MGX 8880 Media Gateway
• Cisco MGX 8850 (with PXM-45/C)

Physical specifications

Front Card

• Height: 15.65 in. (397.51 mm)
• Depth: 15.83 in. (402.08 mm)

Back Card

• Height: 7 in. (177.8 mm)
• Depth: 4.125 in. (104.76 mm)

Environmental

• -32° to 104°F (0° to 40°C) for normal operation
• Operating humidity (non-condensing): 10 to 85 percent

Power consumption

134W for 48-T1E1, 169W for 6-T3, and 180W for 4-OC3/STM1

Compliance

Safety

• BellCore NEBS: Level 3
• UL 1950, CSA C22.2 No. 950
• AS/NZS 3260/ACA Approval
• IEC 60825-1, EN60825-1
• IEC 825-1
• IEC 60950/EN 60950/TUV/CE mark
• UL 60950
• BABT: Telecom Requirement
• ETS 300 047 : Telecom Standard

EMI/ESD

• 47 CFR Part 15: 2002
• CISPR22: 1997
• EN55022: 1998
• EN61000-3-2: 2000
• EN61000-3-3: 1995
• EN300386: 2001
• VCCI: V-3/2000.04
• EN300386: 2001
• EN50082-1: 1992
• EN50082-1: 1997
• EN61000-6-1: 2001
• Central Office Equipment (USA only) GR1089: Issue2: Rev1: 1999 and GR1089: Issue 3: October 2002

SONET

• Bellcore GR-253-Core (GR for SONET transports)
• ANSI T1.105 (SONET: Network element timing and synchronization)

SDH

• G.707
• G.957
• G.783

T3 

• T1.101, T1.403, T1.404, G.704

T1

• TIA-968-A 2002 (USA)
• CS-03 Issue 8 1996 (Canada)
• T1.101 / T1.403

E1

• RTTE Directive (1999/5/EC) 1999 (CE)
• G.703

Telcordia CLEI

• GR-485-CORE - CLEI coding
• GR-383-CORE - CLEI code product label
• GR-209-CORE - PCN Process

Cisco VXSM OC-3/STM-1 Interface

Cisco VXSM OC-3/STM-1 back cards use Cisco industry-standard Small Form-Factor Pluggable (SFP) modules. SFPs minimize operations and sparing costs by allowing Cisco VXSM OC-3/STM-1 back cards to be easily adapted to various types of optical interfaces. For example, a Cisco VXSM OC-3/STM-1 back card with Multi-Mode Fiber (MMF) interfaces can be quickly changed to Single-Mode Fiber (SMF) by removing the MMF modules and inserting SMF modules. Table 4 provides information about the Cisco VXSM OC-3/STM-1 back card interfaces.

Table 4. Cisco VXSM OC-3/STM-1 Back-Card Interfaces

Feature

MMF

SMF Intermediate Reach (SMF-IR)

SMF Long Reach
(SMF-LR)

Port speed

155 Mbps

155 Mbps

155 Mbps

Maximum number
of OC-3/STM-1 ports

4

4

4

Port media

MMF

SMF

SMF

Port connector

LC

LC

LC

Optics

LED 1310 nm

Laser 1310 nm

Laser 1310 nm

Tx power level (dBm)

-19 min
-14 max

-15 min
-8 max

-5 min
0 max

Rx power level (dBm)

-30 min
-14 max

-28 min
-8 max

-34 min
-10 max

Typical reach (km)

2

15

40

Redundancy

1:1

1:1

1:1

Line protection

APS 1+1

APS 1+1

APS 1+1

Cisco VXSM T3 Interface

The Cisco VXSM T3 interface supports up to 6 ports. The Cisco VXSM T3 back cards may be deployed in pairs; each supporting 3 T3 ports (Table 5).

Table 5. Cisco VXSM T3 Back-Card Interfaces

Feature

T3

Port speed

44.736 Mbps

Maximum number of T3 ports per back card

3

Number of back cards per front card

1 or 2

Port media

75-ohm Coax pair

Port connector

3 pair of SMB Coax

Line coding

Binary 8-zero substitution (B8ZS) or alternate mark inversion (AMI)

Line framing

ANSI T1.408 Extended Superframe, Super Frame format line framing

Redundancy

1:1

Cisco VXSM T1/E1 Interface

The Cisco VXSM T1/E1 interface supports up to 48 T1/E1 ports. The Cisco VXSM T1/E1 back cards may be deployed in pairs; each supporting 24 T1/E1 ports (Table 6).

Table 6. Cisco VXSM T1/E1 Back-Card Interfaces

Feature 

T1

E1

Port speed

1.544 Mbps

2.048 Mbps

Maximum number of T1/E1 ports per back card

24

24

Number of back cards per front card

1 or 2

1 or 2

Port media

100-ohm twisted pair

120-ohm twisted pair

Port connector

50-pin Amphenol

50-pin Amphenol

Line coding

Binary 8-zero substitution (B8ZS) or alternate mark inversion (AMI)

HDB3 or AMI

Line framing

ANSI T1.408 Extended Superframe, Super Frame format line framing

ITU-T G.704 basic frame, multiframe, cyclic-redundancy-check (CRC) framing

Redundancy

1:1

1:1

Availability and Ordering

Table 7 provides availability and ordering information for the Cisco VXSM.

Table 7. Availability and Ordering Information for Cisco VXSM

Part Number

Product Description

MGX-VXSM-155

Cisco VXSM OC-3/STM-1 Front Card

VXSM-BC-4-155

Cisco VXSM OC-3/STM-1 Back Card

MGX-VXSM-T3

Cisco VXSM T3 Front Card

VXSM-BC-3T3

Cisco VXSM T3 Back Card

MGX-VXSM-T1E1

Cisco VXSM T1/E1 Front Card

MGX-BC-24T1E1

Cisco VXSM T1/E1 Back Card

For More Information

For more information about Cisco service and support programs and benefits, go to http://www.cisco.com.