Specifications

5-9
PA-MC-2T3+ Multi-Channel T3 Port Adapter Installation and Configuration
OL-3526-05
Chapter 5 Configuring Channelized mode for the Cisco PA-MC-2T3+
Configuring a Channelized T3 Link
Configuring the T3 controller to Enable Remote Loopback
Equipment customer loopback enables the PA-MC-2T3+ port adapter to respond to remote T3
loopback and T1 loopback requests it receives from the remote site, while equipment network
loopback causes the PA 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 T3 remote loopbacks are only available when you use c-bit parity framing.
Shutting Down the T3 Controller
You can shut down the T3 controller on the PA-MC-2T3+ with the controller command:
shutdown
This command sends a DS3 idle signal toward the network. You can bring the T3 controller back up with
the no shutdown controller command.
Examples follow:
• The example that follows is for a port adapter on a VIP in interface processor slot 1:
Router(config)# controller t3 1/0/0
Router(config-controller)# shutdown
• The example that follows is for a port adapter in slot 1 of the Cisco 7200 series routers:
Router(config)# controller t3 1/0
Router(config-controller)# shutdown
Table 5-1 Using loopback commands
loopback local Sets the T3 port into local loopback
mode. Local loopback loops the router
output data back toward the router at the
framer.
Router(config)# controller T3 10/0/0
router(config-controller)# loopback
local
loopback network Sets the T3 port into network line
loopback mode. Network line loopback
loops the data back toward the network
(before the framer).
Router(config)# controller t3 10/0/0
router(config-controller)# loopback
network line
loopback remote
1
1. Remote loopback mode works with C-bit framing only. The other loopback modes listed above work with C-bit, and M23. Refer to the “Setting the
Framing Type for the T3 Controller” section on page 5-5 for information on configuring C-bit framing.
Sends a command to the remote T3 device
instructing it to loop itself back to the
network (before the framer at the remote
T3 device).
Router(config)# controller T310/0/0
router(config-controller)# loopback
remote