75 Isdn Communications (Europe) - ZyXEL Communications omni TA128 User Manual

9
X.75 ISDN
Communications
(Europe)
This chapter will describe how to set-up and configure your TA128
with X.75 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
X.75 was originally designed for packet-switched signaling systems
in public networks to provide data transmission services. But it is
now also used as the link layer for telematic services (as defined in
T.90) in ISDN. These services include both ISDN circuit-switched
mode (DTE-DTE communication) and ISDN packet-switched
mode (DTE-DCE communication).
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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