Specifications

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Cisco IGX 8400 Series Provisioning Guide, Release 9.3.3 and Later Releases
OL-1166-04
Chapter 2 Cisco IGX 8400 Series Cards
Universal Voice Module
• Support for idle code suppression (ICS) on super-rate data connections (see the “Idle Code
Suppression on the UVM” section on page 2-39)
• Support for many different signaling types (see Table 7-2)
• Pulse code modulation (PCM) at 64 kbps on all voice channels
• Adaptive pulse code modulation (ADPCM) voice compression at 32 kbps or 24 kbps per G.726
• Low delay code-excited linear predictive coding (LDCELP) voice compression at 16 kbps per
G.726, on a maximum of 16 channels per card
• Conjugate structure algebraic code-excited linear predictive coding (CSACELP) compression at
8 kbps on 16 channels per G.729 or 32 channels per G.729A
• Support for channel associated signaling (CAS) and common channel signaling (CCS)
• Voice activity detection (VAD), which decreases trunk utilization on a connection by about 50%
• A-law or mu-law voice encoding on a per-channel basis
• Programmable voice circuit gain in the range –8 dB through +6 dB
• Flexible signaling-bit conditioning when a circuit alarm occurs
• Up to 64 ms integral echo cancelling per channel for all voice connection types
• D-channel compression
• Fax relay, for compressing G3 fax traffic to 9.6 kbps through the network (see the “Fax Relay on
the UVM” section on page 2-39)
• Per-channel, automatic bandwidth upgrade for modem or fax circuits
• Supports up to 16 fax relay channels
For more information on voice technology specifications, see the “UXM-E Physical and Electrical
Specifications” section on page A-4 in the Cisco IGX 8400 Series Installation Guide.
Table 2-23 Connections Supported by the UVM
Connection
Type
Switch
Software
Parameter
Maximum
Number of
Channels
Voice Coding
Type Description
Vo i ce
1
p 24 (T1)
30 (E1 and Y1)
PCM Carries 64 kbps PCM voice, and supports A-law or
mu-law encoding and conversion, gain adjustment,
and signaling.
Voi ce v 24 (T 1)
30 (E1 and Y1)
PCM Carries 64 kbps PCM voice with VAD.
Vo i ce a 3 2
a24
24 (T1)
30 (E1 and Y1)
ADPCM Carries 32 or 24 kbps ADPCM voice.
Vo i ce c 3 2
c24
24 (T1)
30 (E1 and Y1)
ADPCM Carries 32 or 24 kbps ADPCM with VAD voice.
Voice 116 16 LDCELP Carries 16 kbps LDCELP voice.
Voice 116v 16 LDCELP Carries 16 kbps LDCELP with VAD voice.
Voice g729r8 16 CSACELP Carries 8 kbps CSACELP
2
voice in accordance with
the G.729 standard.
Voice g729r8v 16 CSACELP Carries 8 kbps CSACELP with VAD voice in
accordance with the G.729 standard.