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
Channelized Voice Module
• Frame bit errors
• Remote (yellow) alarm
• AIS—All-ones in channel 16 (CAS mode)
Channelized Voice Module
Table 2-28 shows the front and back cards supported for the channelized voice module (CVM).
The CVM provides voice, data, and voice+data service for the IGX. Three different front cards and
multiple back cards allow for users to select the configuration that best fits their networking
environment.
The CVM supports the following features:
• Packet assembler and disassembler (PAD) for voice or data connections
• Software-configurable ports on the T1, E1 or J1 back cards
• Self-test of all onboard circuits, including optional echo cancellers
• Up to 8:1 voice compression using ADPCM with integral VAD
• Integral, per-channel, echo cancelling (requires optional Integrated Echo Canceller (IEC) on the
front card—(CVM T1 EC and CVM E1 EC front cards only)
• A-law or mu-law voice encoding on a per-channel basis
• Programmable voice circuit gain in the range –8 dB through +6 dB
• Support for many domestic and international signaling types
• Flexible signaling-bit conditioning when a circuit alarm occurs
• Per-channel tone detection to disable compression for modem or fax circuits
• Support for 2.4, 4.8, 9.6, and 56 kbps subrate data connections using DS0A (available with CVM
model A firmware only). In-band DS0A link codes are translated into EIA control lead states for
HDM- or LDM-to-CVM connections.
• Support for super-rate data connections using aggregation of up to 8 contiguous time slots.
• Support for idle code suppression (ICS) on super-rate data connections (see the “Idle Code
Suppression on the CVM” section on page 2-46)
• Support for transparent TDM channels through a network
Table 2-28 Channelized Voice Module Front and Back Cards
Front Cards Back Cards
CVM BC-T1
BC-E1
BC-J1
CVM T1 EC BC-T1
CVM E1 EC BC-E1
BC-J1