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Cisco VG350 Voice Gateway Hardware Installation Guide
OL-25970-01
Chapter 2 Cisco Double-Wide High Density Analog Service Modules
Port Numbering Conventions
Port Numbering Conventions
Port numbering conventions for the Cisco VG350 Voice Gateway are as follows:
• Two Compact Flash slots, CF0 and CF1.
• GE ports are 10/100/1000 BASE-T, numbered GE 0/0 through GE 0/2.
• 10/100BASE-T ports are numbered 10/100BASE-T 0/0 and 10/100BASE-T 0/1 from right to left.
• FXS voice port numbering begins at 2/0/0 to 2/0/71 or 2/0/47 and 4/0/0 to 4/0/71 or 4/0/47,
depending on the number of voice ports.
The ports numbered 2/0/x are for the SM installed in slot 1 and the ports numbered 4/0/x are for the
Service Module (SM) installed in slot 2.
Connecting to the Double-Wide High Density Service Module
Ports
Three RJ-21 female connectors are available on the SM-D-72FXS service module. The middle RJ-21
connector accesses FXS ports 0 to 23, the left RJ-21 female connector accesses ports 24 to 4, and the
right RJ-21 connector accesses ports 48 to 71. Use RJ-21 male connector to connect from the DWSM
RJ-21 ports to an FXS port RJ-11 distribution box.
Note Use an RJ-21 cable with Amphenol 50-pin connectors.
Online Insertion and Removal
The DWSM can be hot-inserted into the VG350 Voice Gateway without any potential of electrical
damage either to the SM or the Host because the Online Insertion and Removal (OIR) logic is present
on all SM designs.
OIRl is the ability to insert and remove an SM while the system is running without causing electrical
damage to the SM or Host and without interfering with the operation of any other modules or portions
of a running system.
The basic feature for OIR support on an SM is the control and isolation of the 12V power rail via a
field-effect transistor (FET). This FET is enabled in a controlled fashion after the SM card is fully
inserted.