Before You Configure an Interface

Before you configure a channelized T3 interface, verify the following:

You have installed the line module and the I/O module correctly.
Each configured line module is able to transmit data to and receive data from your switch connections.

For more information about installing line modules and I/O modules, see the ERX Hardware Guide.

You should also have the following information available:

Framing type, clock source, cable length, and the loopback method for each T3 controller
Framing type and clock source for each T1 channel
Timeslot mapping and line speed for each fractional T1 channel
HDLC channel information, such as data inversion information, cyclic redundancy check (CRC) type, idle character, maximum transmission unit (MTU), and maximum receive unit (MRU)