Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

E1 PRI Bchannel maintenance

Quoting from Service parameter help page:

S0/DS1-0@SDA123456789ABC = 0000 1111 0000 0000 0000 0001 (24 bits for T1. Channel number begins with 1 to 24 from left to right. In the case of PRI, the last bit specifies the D-Channel, which does not get affected. In this example, the 5th through 8th B-Channels are out of service.)


S1/DS1-0@DLS2-CM136-VG200-2.SELSIUSCMLAB.CISCO.COM = 0000 0000 0000 0000 0000 0000 1111 1111 (32 bits for E1. B-Channel number begins with 1 to 32 from left to right. The 16th channel specifies the D-Channel. The last bit does not affect any channel. In this example, the 25th through 31st channels are marked out of service.)

The above text describes a T1 and E1 PRI setting respectively. In both cases, the last bit is a 1 which doesnt really affect any thing. In the case of a T1, the last bit is the D-channel, but in case of a E1, last bit is not the Dchannel. So in case of a E1, should the 16th channel be set to 1 or 0 ?

Lets assume a 4 channel PRI


Super Bronze

Re: E1 PRI Bchannel maintenance

Hi Sankar

I've done a few partial PRIs in the UK, but they've all been 8/12 channels so far and I've just used the first 8/12 bits set to 0, with all 1s for the rest.

Note the line about E1 says 'the 16th channel specifies the D-channel' - I'd just ensure that is set to 1, though I doubt it would disable it either way (as with the T1). It mentions the last bit doesn't affect any channel (as there are 32 bits to cover 30 channels + 1B channel) but is a little vague about the 16th....



Aaron Please remember to rate helpful posts to identify useful responses, and mark 'Answered' if appropriate!
CreatePlease to create content