120 Isdn Communications; Placing Outgoing Calls - ZyXEL Communications ACCESSING INTERNET & INTRANET omni series User Manual

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:
Layer 1
Layer 2
Layer 3
Error Control
V.42bis
Async or Sync
if used with
V-Series DTE
Bundle
Max. Line
Speed
AT-Command
Configuration

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
V.110
80 Bits
Framing
None
None
No
No
Async Only
No
Async: 38.4
Kbps
ATB10
V.120 ISDN Communications 57
V.120 X.75
HDLC HDLC
LAPD LAPB
Transparent
V.120 ISO8208T.70 NL
Yes Yes
Yes Yes
Async Async Only
Only
Yes Yes
64Kbps 64Kbps
128Kbps 128Kbps
ATB20 ATB00
Transparent
ATB01: T.70 NL