> The robbed bit T1 has 2 signalling bits, but the usually do the same > thing, so its really like having just one signalling bit. However, the > timing of changes to that signalling bit can follow one of several > patterns. You will see the terms immediate start and delayed dial used, > as well as the terms LS, GS, etc. These are more descriptive, as they > describe what will actually happen to the signalling bit.
Hmmm... I'd worked with T1s where the signalling bits (6th, 12th, 18th and 24th DS0 LSBs) formed a 2- or 4-bit word which described the channel state -- Which signalling type is that? I had no idea that the robbed bits (still every 6th frame?) were used to recreate the analog-side signalling to that kind of extent. > Other variants are that only signalling bit A or only bit B changes; the > signalling bits are inverted; the line only works during a full moon; etc. How is reverse-battery (kewlstart) signalled? Actually do you have any resources I could devour now that I've had this taste? Thank you for taking the time to explain this. I thought that the signal bits were standardized... Of course it works out that like most other things in technology, there are many standards to choose from. :-) Regards, Andrew _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
