Cross connecting two routers with channelized interfaces


sorry for this dumb question.

Is it possible to connect two routers like below ?

RouterA/cstm1 ---- dark fiber ---- cstm1/RouterB

The interfaces used in this case are channelized STM1 in both sides.
Between RouterA and RouterB I would like to create many low-speed
interfaces ranging from 64Kbps up to 2Mbps. Between these two routers
there is no MUX.

The framing mode has to be SDH.

Thanks in advance!


Yes, u will have to connect the fibers in a cross manner..and setup one side to generate the clock..


Hi Faisal,

I have tried the setup in my lab. I can get the cSTM1s UP and the
controllers E1 up. But when I try to configure the subinterface, the
protocol does not come online.

Below is the configuration in one of the sides. The other side has
similar configuration.

controller SONET 4/0/2
framing SDH
aug controller au-4-tug-3

controller AU-4-TUG-3 4/0/2.1/1
mode c-12
tug-2 1 e1 1 channel-group 0 timeslots 1

interface Serial4/0/2.1/1/1/1:0
bandwidth 64
ip address
encapsulation ppp
load-interval 30
no fair-queue