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Chapter 5
Configuring the Channelized Mode
Table 5-2
Using loopback Commands (continued)
loopback network line
1
loopback remote
1. Remote loopback mode works with C-bit framing only. The other loopback modes listed above work with c-bit and M23 framing. Refer to the
the Framing Type for the T3 Controller" section on page 5-10
Configuring the T3 Controller to Enable Remote Loopback
The equipment customer loopback command enables the PA-MC-T3-EC port adapter to respond to
remote T3 loopback and T1 loopback requests it receives from the remote site, while the equipment
network loopback command causes the port adapter to ignore remote T3 and T1 loopback commands.
equipment [customer | network] loopback
Router(config)# controller T3 3/0
Router(config-controller)# equipment customer loopback
Router(config)# controller T3 3/0
Router(config-controller)# equipment network loopback
Note
Shutting Down the T3 Controller
You can shut down the T3 controller on the PA-MC-T3-EC with the shutdown controller command.
This command sends a DS3 idle signal toward the network. You can bring the T3 controller back up with
the no shutdown controller command.
The example that follows is for a port adapter in slot 1 of a Cisco 7200 VXR router (with an NPE-G1 or
NPE-G2):
Router(config)# controller t3 1/0
Router(config-controller)# shutdown
Configuring T1 Lines
This section provides procedures and examples for configuring T1 lines on the T3 link of the
PA-MC-T3-EC, and includes information on the following topics:
•
•
•
•
•
•
OL-10589-02
Sets the T3 port into network line loopback mode.
Network line loopback loops the data back toward
the network (before the framer).
Sends a command to the remote T3 device
instructing it to loop itself back toward the
network (before the framer at the remote T3
device).
T3 remote loopbacks are only available when you use c-bit parity framing.
Creating a Logical Channel Group on a T1 Line, page 5-14
Removing a Logical Channel Group from a T1 Line, page 5-15
Setting the Framing Format on a T1 Line, page 5-15
Setting the Yellow Alarm Configuration for a T1 Line, page 5-16
Setting the Clock Source on a T1 Line, page 5-16
Setting the FDL Configuration for a T1 Line, page 5-16
for information on configuring c-bit framing.
PA-MC-T3-EC Port Adapter Installation and Configuration
Configuring a Channelized T3 Link
Router(config)# controller T3 10/0/0
Router(config-controller)# loopback
network line
Router(config)# controller T3 10/0/0
Router(config-controller)# loopback
remote
"Setting
5-13
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