ZyXEL Communications omni series User Manual
X.75 ISDN Communications 65
10
X.75 ISDN
Communications
This chapter will describe how to set-up and configure your TA with
X.75 protocol. The table below shows the specifications of different
ISDN protocols:
X.75 protocol. The table below shows the specifications of different
ISDN protocols:
V.110
V.120
X.75
Layer 1
80 Bits
Framing
Framing
HDLC
HDLC
Layer 2
None
LAPD
LAPB
Transparent
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
if used with
V-Series DTE
Async Only
Async
Only
Only
Async Only
Bundle
No
Yes
Yes
Max. Line
Speed
Speed
Async: 38.4
Kbps
Kbps
64Kbps
128Kbps
128Kbps
64Kbps
128Kbps
128Kbps
AT-Command
Configuration
Configuration
ATB10
ATB20
ATB00
Transparent
ATB01: T.70 NL
Transparent
ATB01: T.70 NL
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).
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).