4-11
PA-MC-2T3+ Multi-Channel T3 Port Adapter Installation and Configuration
OL-3526-05
Chapter 4 Configuring Unchannelized mode for the Cisco PA-MC-2T3+
Configuring an Unchannelized T3 Link
Configuring the T3 controller to Enable Loopbacks
The PA-MC-2T3+ can be configured to respond to or to ignore remote T3 loopback requests sent to it
from the far end T3 equipment.
Equipment customer loopback
enables the port adapter to respond to
remote T3 loopback commands from the remote T3 equipment while
equipment network loopback
causes the PA to ignore remote T3 loopback commands.
equipment
[
customer | network]
l
oopback
Router(config)#
controller T3 1/0
Router(config-controller)#
equipment customer loopback
Note
Remote loopbacks are only available when you use c-bit parity framing.
Table 4-2
Using loopback Commands
loopback local
Sets the interface into local loopback
mode. Local loopback loops the router
output data back toward the router at the
framer.
Router(config)#
interface serial
10/0/0
router(config-if)#
loopback local
loopback network line
Sets the interface into network line
loopback mode. Network line loopback
loops the data back toward the network
(before the framer).
Router(config)#
interface serial
10/0/0
router(config-if)#
loopback network
line
loopback network payload
Sets the interface into network payload
loopback mode. Network payload
loopback loops just the payload data back
toward the network at the T3 framer.
Router(config)#
interface serial
10/0/0
router(config-if)#
loopback network
payload
loopback remote
1
1.
Remote loopback mode works with C-bit framing only. The other loopback modes listed above work with C-bit and M13 framing. Refer to the
the Framing Type for the Serial Interface” section on page 4-6
for information on configuring C-bit framing.
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).
Router(config)#
interface serial
10/0/0
router(config-if)#
loopback remote
loopback remote line
2
2.
These loopback commands are only available when the DSU mode is set to 1, Kentrox mode.
Sends a command to the remote Kentrox
to loop itself back toward the network
before the framer.
Router(config)#
interface serial
10/0/0
router(config-if)#
loopback remote
line
loopback remote payload
Sends a command to the remote Kentrox
DSU to loop only the payload after the
framer back toward the network.
Router(config)#
interface serial
10/0/0
router(config-if)#
loopback remote
payload
