120 Isdn Communications; Placing Outgoing Calls - ZyXEL Communications omni TA128 User Manual

8
V.120 ISDN
Communications
This chapter describes how to set-up and configure your TA128
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 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
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