Manual

1-, 2-, and 4-Port T1/E1 HWICs and 8-Port T1/E1 Network Module
How to Configure T1/E1 HWICs and Network Module
8
Cisco IOS Release 12.4(11)XW5, and 12.4(20)T
Step 8
clock source {line [independent] | internal}
Example:
Router(config-controller)# clock source line
line specifies that the clocking on this controller is derived
from an external source, generally the telephone central
office. line independent configures the port to be
independent in the TDM docmain, which is when
network-clock-participate is configured on the card.
internal specifies that the clock is generated by internal
controller circuitry.
Default is line.
Step 9
line-termination {75-ohm | 120-ohm}
Example:
Router(config-controller)# line-termination
75-ohm
E1 only. Sets the line termination on an E1 controller.
• 75-ohm specifies the 75 ohm unbalanced termination.
• 120-ohm specifies the 120 ohm balanced termination.
Default is 120-ohm.
Note On the 4-port HWIC and 8-port network module,
line impedance will be set to the same value for each
port in a two-port slice automatically. That is, on the
4-port HWIC, ports 0 and 1 will be set to the same
value, and ports 2 and 3 will be set to the same
value. On the 8-port network module, ports 0 and 1
will be set to the same value, as will ports 2 and 3,
ports 4 and 5, and ports 6 and 7. In these cases, a
message will be displayed. The example here shows
the message displayed when the line termination on
port 0 is changed:
Router(config)# controller e1 0/1/0
Router(config-controller)#line-termination
75-ohm
Changing the line termination for ports 0 and
1 to 75
Step 10
loopback {diagnostic | local {payload | line} |
remote {iboc | esf {payload | line}}}
Example:
Router(config-controller)# loopback remote esf
line
Sets the loopback method for testing the interface. Options
are:
• diagnostic loops transmit signal back to receive
• local puts the interface into local loopback mode at the
payload or line level
• remote puts the interface into remote loopback mode
through an inband bit oriented code (iboc) or, for T1
only, remote esf, which uses fdl codes to set payload
or line levels.
Command or Action Purpose