Installation guide

A-15
Cisco IGX 8400 Series Installation Guide, Release 9.3.3 and Later Releases
OL-1165-06
Appendix A System Specifications
Voice Circuit Support
Voice Circuit Support
This section lists voice circuit specifications. Where appropriate, the text names the card to which the
specification applies.
Minimum pulse density: Zero-code suppression via HDB3 coding
Frame format: Unframed: 32-channel (G.703). Framed: 30 or 31-channel
multiframe per ITU-T G.704.
VF signaling: Channel-associated signaling (CAS) or common channel
signaling (CCS)
Maximum line lengths: 100 meters. The E1 output complies with G.703, so cabling must
not exceed –6dB/1000 ft at 1024 KHz (applies to 75 ohm coaxial
or 120 ohm twisted pair up to 350 meters or 1000 ft). Cisco
supplies cable with a maximum attenuation of 7 dB /1000 ft, but
the maximum cable length for this E1 interface is 100 meters.
Jitter: Transmit output jitter, receive jitter tolerance, and jitter gain meet
G.823.
Electrical interface: Complies with G.703 specification.
Connector: DB-15 female or BNC
Voice channel interface: 24-channel T1 (D4 format)
24-channel T1-ESF
30-channel framed E1
Voice compression: 32/24/16 kbps ADPCM on the CVM
32/24/16 kbps ADPCM
16 kbps or 8 kbps LDCELP (UVM only)
Voice Activity Detection (VAD) compression
Compression algorithm: ITU-T G.721, G.723, G.726
Cisco 32 kbps ADPCM
Cisco LDCELP
Cisco CSACELP
PCM encoding types: Accommodates mu-Law or a-Law encoding.
End-to-end conversion available.
Channel gain control: –8 dB to +6 dB.
Signaling modes: T1: Robbed bit or CCS (ISDN).
E1 and J1: CAS or CCS
Signaling conditioning: Various make-busy and forced-idle routines during circuit alarm,
configurable on a per-channel basis.