Installation guide

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Cisco IGX 8400 Series Installation Guide, Release 9.3.3 and Later Releases
OL-1165-06
Chapter 3 Installing the IGX
Installing Voice Cards
If the intended compression for voice channels is LDCELP and the number of channels on a J1 line
exceeds 16, install cabling for pass-through. For the steps that follow, refer to Figure 3-11 for an
illustration of the possible UVM cabling arrangements. Note that, in Example B, the number of channels
has not exceeded the UVM capacity, so pass-through is unnecessary.
• On port 1 of the primary UVM, connect the cable to the CPE.
• On port 2 of the primary UVM, connect the cable to port 2.
• Connect the cable from port 2 of the primary card to either port 1 or port 2 of the secondary UVM.
Typically, if the secondary UVM is supporting the passed-through channels from only one primary
UVM, you would connect the cable from port 2 of the primary card to port 1 of the secondary card.
However, because the secondary UVM can receive 16 passed-through channels with LDCELP
compression, you can pass 15 channels each from other UVMs.
For a description of the pass-through feature, refer to the Cisco IGX 8400 Series Provisioning Guide.
Figure 3-11 Pass-Through and Standard (External) UVM J1 Cabling
The back slot line numbers correspond to the slot number in which the BC-UVI-2J1EC card resides.
Record the back slot number and port number of each line. These numbers are necessary for configuring
the system after you complete hardware installation.
External
UVM
Passed-
through
UVM 2
Pass-through
Passing
(transparent)
UVM 1
A. One pass-through line
B. External line
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