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Voice Modules (VCMs & DPVs)
DPV Configuration, Status and Diagnostics
The DPV is supported in TMS-3000 networks GTS 2.2 or higher, and in OCM-1000 networks OMS
(OCM Management System) V2.0 and higher. The DPV modules accept configuration, status, and
diagnostic commands from the TMS Controller and reports status and alarms back to the Controller.
Note
Refer to Operation Manual for TMS-3000 Controller, GDC 036R603-Vnnn, User Guide for OCM-1000,
GDC 036R612-Vnnn, and Maintenance Console section of the TMS Hardware Manual GDC 036R303-000.
DPV Signal Paths
The DPV have both transmit and receive gain adjustments which are set from the TMS Controller.
The OCM is generally used at the 0 dB test level point in a voice network but is customer dependent.
For example, PBX systems generally transmit at 0dBm, other voice systems may transmit at -16 dB
(4W E&M). The nominal receive input level from a PBX is 0 dB but other voice systems may
require a +7 dB (4W E&M) input level. These levels may be adjusted through the TMS Controller
to match the customers nominal input and output levels. To measure and set the transmit and receive
levels, the measuring device should be inserted at points A (by breaking into the appropriate rear
panel RJ jack), or B (at the receive customer site) in the diagram.
The transmit or receive gain offset can be adjusted in 0.5dB steps from +1.5 dB (gain) to -6.0 dB
(loss) for four wire E&M. To avoid instability, two wire circuits don't have any net gain, so the gain
adjustment is limited to 0.0 dB to -6.0 dB.
For diagnostic purposes, a 1004 Hz at -15 dBm0 test tone can be generated by the voice channel
modules under TMS control (Test Tone in Figure 6-3 on page 6-15) and injected in the transmit
direction. This nominal level is subject to receive gain adjustments at the remote end, but not to
transmit gain adjustments. For example, if the 1004 Hz test tone is injected with the remote receive
base and offset gains set to 0 dB, a -15 dBm signal level should be measured at the two wire or four
wire remote receive port. If the receive base gain is set to +7 dB, a level of -8 dBm should be
measured at the remote receive port.
Voice channel modules can also measure the peak PCM transmit or receive level and display it on
the TMS or OCM Controller ("Monitor" shown in Figure 6-3). The Monitor function should not be
used for setting up levels or for accurate measurements. It functions only as continuity checker to
show that the signal did get to the other side.
Note
The Dual Private Voice (DPV) module has both transmit and receive gain adjustments set from the TMS
Controller. Refer to Operation Manual for TMS-3000 Controller, GDC 036R603-Vnnn,
036R340-000
Issue 16
Office Connunications Manager OCM-1000/OCM-2000
Installation & Operation
DPV Overview
6-13
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