On your serial NIM, you can enable the Enhanced Object Tracking (EOT) feature to consider the
carrier-delay timer when tracking the status of an interface. The carrier-delay command in tracking
configuration mode enables tracking to consider the carrier-delay timer configured on an interface. You
can specify a period of time (in seconds) to delay communicating status change of a tracked interface.

Example:

Router(config)# track 3 interface ethernet 0/1 line-protocol

Router(config-track)# carrier-delay ?

<0-60> Carrier Transitions delay seconds

msec delay specified in milliseconds

Router(config-track)# delay up 30

Setting up NIM Bring up Time

You can set a specific amount of time for the router to wait before trying to bring up a NIM interface

after the NIM goes down using the serial restart-delay command in the interface configuration mode.

Example:

Router(config-if)# serial restart-delay 500

NRZI Line-Coding Format

The serial NIM supports the non return to zero inverted (NRZI) line-coding format for signal
transitions.NRZI uses relational encoding to interpret signals rather than determining absolute values.

You can enable NRZI format using the nrzi-encoding command in the interface configuration mode.

Example:

Router(config-if)# nrzi-encoding

Enabling DTR Pulse-Time

You can enable the data terminal ready (DTR) pulse signal intervals on the serial interfaces using the

pulse-time command in interface configuration mode. When the serial line protocol goes down (for
example, because of loss of synchronization), the interface hardware is reset and the DTR signal is held
inactive for at least the specified interval. Setting up the DTR pulse signal intervals is useful for handling
encryption or other similar devices that use the toggling of the DTR signal to resynchronize.