ZyXEL ACCESSING INTERNET & INTRANET omni series Manual de usuario Pagina 69

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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
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