[nsp] E1 connection problem help me out

[Munit Singla]

Hi All

 We have the following topology for connecting two E1 cards(NM2CE1B)
using external CSU/DSU.

(NM2CE1B)[DB15]<----->[csu/dsu]--------------[csu/dsu]<------->[DB15](NM2CE1B)






If anybody has the setup similar to this, could you provide product
information on this CSU/DSU.

or if any other way for connecting E1 connections back to back for
specific above network module.


Regards
Singla
I would be very thankful if you pass me this inf ASAP