Purpose
Command or Action
•
number
—
Allowed values are 0 to 34368. The default is 34368.
Enables scrambling for the E3 physical layer interface. The default is no
scramble.
Router(config-controller)#
scramble
Step 3
Sets the national reserved bits on an E3 line. The default is 0.
Router(config-controller)#
national bit
{
0 | 1
}
Step 4
Sets the framing on the interface, where:
Router(config-controller)#
framing
{
bypass
|
g751
|
g832
}
Step 5
•
bypass
—
Configures framing bypass to use the full E3 bandwidth.
•
g751
—
Specifies g751 framing. This is the default for E3.
•
g832
—
Specifies g832 framing.
Selects the CRC size in bits, where:
Router(config-controller)#
crc
{
16 | 32
}
Step 6
•
16
—
16-bit CRC. This is the default
•
32
—
32-bit CRC.
Specifies loopback is enabled for the unchannelized E3 serial interface,
where:
Router(config-controller)#
loopback
{
network | local | remote
}
Step 7
•
local loopback
—
Loops data from the transmit path to the receive
path.
•
network loopback
—
Loops data received on the external port to the
transmit path and back out the external port.
•
remote loopback
—
Sends a far-end alarm control request to the remote
end requesting that it enter into a network line loopback.
Shuts down the E3 interface.
Router(config-controller)#
shutdown
Step 8
Sends a BERT pattern on an E3 line, where:
Router(config-controller)#
bert pattern
pattern interval 1-14400
Step 9
•
pattern
—
Specifies the length of the repeating BERT test pattern.
Allowed values are 2^15, 2^20, 2^23, 0s, 1s, and alt-0-1.
•
interval time
—
Specifies the duration of the BERT test, in minutes.
The interval can be a value from 1 to 14400.
Verifying the Interface Configuration
Use the show interface serial command to verify the interface configuration:
Router#
show interface serial 1/0/0.1/1:0
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide, Cisco IOS
XE Everest 16.5
304
OL-14127-17
Configuring the 1-Port Channelized OC-3/STM-1 SPA and 1-Port Channelized OC-12/STM-4 SPA
Required Configuration Tasks