dms@scheidt.chem.nd.edu wrote :
> T1 is a four-wire connection used to deliver 24 64 Kbps full-duplex PCM
> channels (called DS0s) via TDM.
> A T3 is a coax cable that presents a DS-3, which is
> 28 DS1s, or 672 DS0s, an aggregate data rate of 44.736 Mbps. DS3s are
> almost always presented over fibre these days.
Note that most DSL is ADSL (Asymmetric Digital Subscriber Line), meaning the
max data rate is only available in one direction at a time. For T1/T3, the
max speed is available both directions at once. Symmetric DSL does exist,
but is rarely used.
Randall
/// unsubscribe/change address requests to majordomo@autox.team.net or try
/// http://www.team.net/mailman/listinfo
/// Archives at http://www.team.net/archive/shop-talk
|