Thanks KCFLHRC for the response I thought that was the case on the msdl card only neededed power from the backplane. The issue I was having I had installed the nt5d12 for loops 26 and 27 this is a 3 group cs1000m machine release 7.50. I had set the ntbk51 for dnum 13 I was building the dchannel card and I got the sch message 5575 so I tried ever device number still the same this was in group zero . So I tried in group one it would take the information. I when back to check the devices build could not find a conflict with number 13. Their was two devices build for msdl card onboard type in group one 9,10 so I could build this dchannel on 11,12,13,14,or 15 in group one. I know that the documention said only 16 devices for the hole system. I guess my only other question is can you build msdl card in group one for a nt5d12 in group zero I assume so. The reason for this set up is no space to add the ddp card with out adding a fourth network group. Thanks for your comments