Julian Lyndon-Smith wrote: > Euro ISDN PRI have 31 channels, 16th used for signalling
Noop, I disagree, its 30 channels for payload. A "raw" E1 (aka. G.703) is 2.048 Mbps = 32 x 64000 bps = 32 TimeSlots/Channels. And a framed E1 (aka. G.704+G.732, Structured G.703, 30B+D) has 30 channels for transporting and 2 for signaling/sync. Time slot zero (TS0) is used for synchronization and TS16 is used for signaling. It is possible to use 31 channels but I have never seen that in use for voice purpose but it's quite common in datacom. Some references: http://www.syncuniversity.org/drsync/q34.php http://telecom.tbi.net/e1_frm.html http://telecom.tbi.net/t1_frm.html /Mats _______________________________________________ Asterisk-Doc mailing list [email protected] http://lists.digium.com/mailman/listinfo/asterisk-doc
