A channel bank allows you to go from DS1 to DS0; i.e. it takes the 24 channels from a DS1 (T-1) and spins off individual DS0's.
For instance, you could plug a T-1 PRI (23 channels + 1 channel for signaling) into a channel bank and get DS0 POTS (plain old telephone service) lines, which can drive a standard phone. One advantage here is a PRI T-1 is 2 or 4 wires, whereas 24 POTS lines are 48 wires (24 pair), so for a voice provider you can deliver more lines/services per pair of wire. Much the same happens on the T-1 to T-3 side with a wide bank (M13 or EZ T3 mux, ect). A T3 is 28 T-1's, so a provider can mux up to 28 T-1's from customers into a T-3, meaning fewer pairs of wire to transport or cross connect. Collocation is priced on U's of rack space or square footage and is often quite expensive at the LEC's facilities. T-3 ports are much cheaper (per DS0) than T-1 ports for the provider, who can then use a relatively cheap wide bank to get T-1's then a channel bank to get DS0's. -- James H. Edwards Routing and Security Administrator At the Santa Fe Office: Internet at Cyber Mesa [EMAIL PROTECTED] [EMAIL PROTECTED] (505) 795-7101
signature.asc
Description: This is a digitally signed message part
_______________________________________________ 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
