E1 to E1

[Eldho E Kuriakose]

any one having experience in connecting togther two E1 between routers in a lab environment...

[Nicholas Matthews]

If you're doing PRI it is very simple.

Make sure that you have a T1/E1 crossover cable (not the same as a normal crossover) between the two ports.

On one side your configuration will look this this:

controller e1 0/0/0

clock source line

pri-group timeslots 1-31

network-clock-select 1 e1 0/0/0

interface serial0/0/0:15

isdn incoming-voice voice

-------

Other side:

controller e1 0/0/0

clock source internal

pri-group timeslots 1-31

interface serial0/0/0:15

isdn incoming-voice voice

isdn protocol-emulate network

hth,

nick

[LysetskyyS]

Hello! Could someone explain why we need command "isdn protocol-emulate network/user"?

As I understand it's for defining who is clock master and clock slave on E1 line?

If is that so why we need command "clock source internal/line"?

[Nicholas Matthews]

There are two different layers you're working there.

clock source line refers to the synchronization of bits in the layer 1 and layer 2 level. This is a generic T1-level configuration. You would use this for many different types of T1 connections.

The 'isdn protocol-emulate network' decides which side is going to be the Q.931 network or user side switch. This enables a different type of Q.921 and Q.931 messaging between the device. This configuration is specific to PRI's.

hth,

nick