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Cisco MGX 8800/8900 Series Hardware Installation Guide
Releases 2 - 5.2, Part Number OL-4545-01, Rev. H0, May 2006
Chapter1 Product Overviews
Cisco MGX 8880 Media Gateway
Features and Benefits
Table 1 -9 lists the features and benefits of the Cisco VXSM.
Table 1 -10 lists specifications for VXSM features.
Table1-9 VXSM Features and Benefits
Feature Benefit
High density •Scales up to 8064 VoIP DS-0s per service module
•Lowers capital expenditures and operating expenses by maximizing density
per platform
•Allows 40,320 VoIP DS-0s per chassis and 120,960 VoIP DS-0s 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 48 T1/E1 interfaces per service
module
High availability Ensures 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
Table1-10 VXSM Feature Specifications
Feature Description
Call control H.248, MGCP, TGCP
Signaling interfaces Signaling System 7 (SS7) and Inter-Machine Trunk (IMT); ISDN Primary Rate
Interface (PRI)
Voice compression G.711, G.726, G.729a/b, Clear Channel
Voice features •G.165, G.168-2000 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
•Tone detection and regeneration including dial tone, busy, ring back, and
congestion with local country variants; programmable tones
•Dual Tone Multi Frequency (DTMF) relay (RFC 2833)
Modem and Fax •Fax and modem pass-through
•T.38 F ax R elay
IP •Real-time Transport Protocol (RTP) (RFC 1889), DTMF Relay (RFC
2833), Differentiated Services (DiffServ) aware
ATM Standards-based ATM Adaptation Layer 2 (AAL2)