ZyXEL Communications ACCESSING INTERNET & INTRANET omni series - Manual (Page 69)

V.120 ISDN Communications 57
9
V.120 ISDN
Communications
This chapter describes how to set-up and configure your TA with the
V.120 ISDN protocol. The table below shows the specifications of
different ISDN protocols:
V.110 V.120 X.75
Layer 1 80 Bits
Framing HDLC HDLC
Layer 2 None LAPD LAPB
Transparent
Layer 3 None V.120 ISO8208T.70 NL
Error Control No Yes Yes
V.42bis No Yes Yes
Async or Sync
if used with
V-Series DTE Async Only Async
Only Async Only
Bundle No Yes Yes
Max. Line
Speed Async: 38.4
Kbps 64Kbps
128Kbps 64Kbps
128Kbps
AT-Command
Configuration ATB10 ATB20 ATB00
Transparent
ATB01: T.70 NL
Placing outgoing calls
Some switches transmit all network signals through the D channel
(out of band signaling), allowing both B channels to be used
exclusively for your communication purposes. This allows for
throughput of 64Kbps per channel. However, not all switches
support out-of-band signaling at this time. For switches that do not