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8
V.110 and Synchronous
Mode Communications
V.110 is most popular in Japan. The table below shows the
specifications of different ISDN protocols:
Layer 1
Layer 2
Layer 3
Error Control
V.42bis
Async or Sync
Bundle
Max. Line
Speed
AT-Command
Configuration
Note : BONDING protocol for synchronous mode will be F/W upgradeable at
ZyXEL's option.
Answering a V.110 call
Once you set the proper V.110 communication mode, there is no
need to configure the ISDN mode to the protocol of an incoming
call. The omni will be able to determine the correct protocol to use
by examining the data coming in from the remote site if the device is
set to auto-answer or once an answer command is issued.
To allow the TA to answer the incoming call, you need to set S0 to a
value greater than 0 (i.e. ATS0=1). If S0 is not set (S0=0), the DCE
V.110 and Synchronous Mode Communications 51
Synchronous
(external)
Transparent
None
None
No
No
Sync
Yes (Note)
64Kbps
128Kbps (Note)
ATB11&M1
(Sync Data)
ATB11&M3*I1
(V.25bis Sync HDLC)
V.110
X.75/V.120
80 Bits
HDLC
Framing
None
LAPB/LAPD
None
ISO8208 T.70
NL/ V.120
No
Yes
No
Yes
Async
Async
No
Yes
38.4 Kbps
64Kbps
128Kbps
ATB10
ATB0:
Transparent
ATB01: T.70
NL/ ATB20
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