ZyXEL Omni TA 128 User Guide - Page 71

X.75 ISDN, Communications, Europe

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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: V.110 V.120 X.75 Layer 1 80 Bits HDLC HDLC Framing 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 Async Only Async Async Only if used with V- Only Series DTE Bundle No Yes Yes Max. Line Async: 38.4 64Kbps 64Kbps Speed Kbps 128Kbps 128Kbps AT-Command ATB10 ATB20 ATB00 Configuration 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). 59

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59
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:
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
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).