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Voice Modules (VCMs & DPVs)
VCM Technical Specifications
Table 6-3
VCM Technical Specifications
Item
Voice Compression
Signaling and
Synchronization
Overhead Bandwidth
Signaling interfaces,
2W FXS
Signaling interfaces.
2W FXO
6-8
Characteristic
PCM
ADPCM
VLBRV
CELP
CELP
ADPCM
VLBRV
Battery Feed
Max loop resistance
(loopstart)
Max loop length
(loopstart)
Max loop resistance
(groundstart)
Loop current
Signaling
Ringing voltage
Ringing cadence
Drive capacity
Registration
Impedance
Return loss
DC loop resistance
Max loop current
Signaling
Ringing detector
Impedance
Return loss
Registration
Office Connunications Manager OCM-1000/OCM-2000
Installation & Operation
Details
64 kbps PCM, no compression
A-law or Mu law encoding, ITU-T G.711
ADPCM
32 kbps ADPCM ITU-T G.721, 1985 ANSI, 1986 ANSI
32, 24, 16 kbps ADPCM compatible with TMS UVC/ADPCM
9.6, 4.8 and 2.4 kbps compatible with TMS UVC/VLBRV
Integral echo cancellation.
Optional FAX bypass for Group-3 FAX signals.
(-013, -014, -015) - 6.4 or 4.8 kbps.
(-023, -024, -025) - 9.6, 6.4, or 4.8 kbps.
Compatible with TMS UVC/CELP . Integral echo cancellation.
FAX bypass for Group-3 FAX signals.
E&M or 4-state signaling.
0 bps
800 bps
0 bps
Internal, -37.5 VDC
1200 ohms maximum loop resistance
9000 feet of 26 AWG wire
600 ohms
25 mA
Loop start or ground start (DPV only). Dial pulse or DTMF
75 VRMS 20 Hz
2 seconds on, 4 seconds off or transparent (FXO-FXS)
1.5 REN (1 2500- type phone)
Meets FCC Part 68, DOC CS-03 (on-premise only), UL1459
600 ohms
14 dB min., 200-3400 Hz, 600 ohm reference
100 ohms (approx.)
100 mA
Loop start operation only
FCC Part 68 Type B ringer
600 ohms
14 dB min., 200-3400 Hz, 600 ohm reference
Meets FCC Part 68, DOC CS-03, UL1459
VCM Overview
(Sheet 1 of 4)
036R340-000
Issue 16
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