3Com VCX V7122 User Manual page 187

C 12: S
HAPTER
S
PECIFICATIONS
Table 38
VCX V7122 Selected Technical Specifications
Function
Trunk & Channel Capacity
Capacity with E1
Capacity with T1
Voice & Tone Characteristics
Voice Compression
Silence Suppression
Packet Loss Concealment
Echo Cancellation
DTMF Detection and
Generation
DTMF Transport (in-band)
Call Progress Tone Detection
and Generation
Output Gain Control
1
Capacity Limitations:
•
When the Echo Canceller's length is set to 64 msec or more, the number of available gateway channels
is reduced by a factor of 5/6. For detailed information see the parameter 'MaxEchoCancellerLength' (see
Table 24 on page 94).
3Com VCX V7122 SIP VoIP Gateway User Manual
ELECTED
Specification
1
1, 2, 4, 8 or 16 E1 spans, 30, 60, 120, 240 or 480 digital channels
1, 2, 4, 8 or 16 T1 spans, 24, 48, 96, 192 or 384 digital channels
G.711 PCM at 64 kbps µ-law/A-law
G.723.1 MP-MLQ at 5.3 or 6.3 kbps
G.726 at 32 kbps ADPCM
G.729 CS-ACELP 8 Kbps Annex A / B
NetCoder at 6.4, 7.2, 8.0 and 8.8 kbps
Transparent coder
G.723.1 Annex A
G.729 Annex B
PCM and ADPCM: Standard Silence Descriptor (SID) with Proprietary Voice Activity
Detection (VAD) and Comfort Noise Generation (CNG)
NetCoder
G.711 appendix 1
G.723.1
G.729 a/b
G.168, configurable tail length per gateway from 32 to 128 msec
Dynamic range 0 to -25 dBm compliant with TIA 464B and Bellcore TR-NWT-000506.
Mute, transfer in RTP payload or relay in compliance with RFC 2833
16 tones: single tone or dual tones, programmable frequency & amplitude; 15
frequencies in the range 300 to 1980 Hz, 1 or 2 cadences per tone, up to 2 sets of
ON/OFF periods.
-32 dB to +31 dB in steps of 1 dB
T
ECHNICAL
(10, 20, 30, 40, 50, 60, 80, 100,120 msec)
(30, 60, 90, 120, 150 msec)
(10, 20, 30, 40, 50, 60, 80, 100,120 msec)
(10, 20, 30, 40, 50, 60, 80, 100,120 msec)
(20, 40, 60, 80, 100, 120 msec).
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