ZyXEL Communications Omni TA128 - Manual (Page 57)

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7
V.110 and Synchronous
Mode Communications
V.110 is most popular in Japan. The table below shows the
specifications of different ISDN protocols:
Synchronous V.110 X.75/V.120
Layer 1 Transparent 80 Bits
Framing HDLC
Layer 2 None None LAPB/LAPD
Layer 3 None None ISO8208 T.70
NL/ V.120
Error Control No No Yes
V.42bis No No Yes
Async or Sync Sync Async Async
Bundle Yes (Note) No Yes
Max. Line
Speed 64Kbps
128Kbps (Note) 38.4 Kbps 64Kbps
128Kbps
AT-Command
Configuration ATB11&M1
(Sync Data)
ATB11&M3*I1
(V.25bis Sync HDLC) ATB10 ATB0:
Transparent
ATB01: T.70
NL/ ATB20
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, either
asynchronous or synchronous, there is no need to configure the
ISDN mode to the protocol of an incoming call. The TA128 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 TA128 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),