User guide

6-135
Cisco Media Gateway Manager 5.0 User Guide
OL-5461-02
Chapter 6 Configuring Hardware
How Do I Configure VISM-PR Cards?
Table 6-67 Field Descriptions for the VISM-PR Specific DS1 Tab, VISM Line Config Category
Field Name Description
Line Number T1/E1 line number.
Ecan Enable Indicates whether the echo cancellation feature is enabled or disabled.
vismEcanTail
(milliseconds)
Maximum tail. Should be set just higher than the worst rount trip delay
anticipated. Convergence times might increase for longer tails, and more
resources are used.
The range is from 24-128. The following discrete values are allowed:
• 24
• 32
• 48
• 64
• 80
• 96
• 112
• 128
Residual Echo Control Residual Echo Control (REC) instructs the canceller how to treat echo
remaining after cancellation. Values include:
• cancelOnly—disables REC.
• suppressResidual—specifies that the residual echo is replaced with
silence.
• reserved—results in a bad value error.
• comfortNoise (default)—specifies that the noise is injected in place of
residual echo at the same level as the ambient noise at the near end.
VAD Compression Indicates whether Voice Activity Detection (VAD) is enabled or disabled on
the compression DSPs.
Signaling Type Indicates the type of signaling used on the line. Values include:
• cas— defines Channel Associated Signaling (CAS).
• ccs—defines Common Channel Signaling (CCS).
• none—specifies that no signaling is used
Ccs Channels Describes the CCS signaling channels or DS0s (also referred to as D-channel).
Cadence Time
(milliseconds)
Describes the cadence time for CAS signals.
Trunk Condition
Enable
Determines if the trunk conditioning should be enabled or disabled on this
line.
Circuit Identifier Identifier of a T1/E1 line. Contains alphanumeric description of a line for the
purpose of better identification.
Tx Digit Order Indicates the order in which ANIs and DNIs will be dialed out from this
outgoing interface.