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Chapter 4 - AT Commands, S-Registers, and Result Codes
Globally Assigned MAC Address (S73=3) options currently generate a
random value similar to the PPP Magic-Number Block, except that the length
of the Endpoint Discriminator follows according to the specifications for the
respective type. Refer to RFC 1990 for more information about the MultiLink
Endpoint Discriminator option and its types.
S-register: S75
Function: Maximum V.110 Buffer Size*
Unit: 1 byte
Range: n=0 (256 bytes),
n=64-255
Default: 0 (256 bytes)
Description:S75 allows the maximum V.110 buffer size to be customized. An adjustable
packet size can provide higher compatibility with devices that cannot handle
a large delay. Reducing the V.110 buffer size reduces delay.
* The MTA128ST-USB is manufactured in two builds. To determine the build of your terminal adapter
(TA), issue the ATI2 command in a terminal window. If the TA responds to the command with MTA128ST-
USB, then it supports V.110. If your TA resonds to the ATI2 command with MTA128ST-USB-RC, V.110
support is not available.
S-register: S76
Function: V.110 Network Rate*
Unit: decimal ASCII code
Range: n=1—-—600 bps,
n=2——1200 bps,
n=3——2400 bps,
n=4——4800 bps,
n=5——9600 bps,
n=6—19200 bps,
n=7—38400 bps,
Default: 7 (38400 bps)
Description:If S77=1, then the network rate of the V.110 connection will match that of
S76 ($MB). If a V.110 call is received and S77=1, then the incoming V.110
network rate must match S76 ($MB) or the connection will fail. If S77=2 and
a V.110 call is originated, then the network rate will match that of S76 ($MB).
If S77=2 and a V.110 call is received, then the setting of S76 ($MB) will have
no effect on the network rate of that call (see S77 for a description for this
case). The value of S76 will change if $MB is changed and the value of $MB
will change if S76 is changed.
* The MTA128ST-USB is manufactured in two builds. To determine the build of your terminal adapter
(TA), issue the ATI2 command in a terminal window. If the TA responds to the command with MTA128ST-
USB, then it supports V.110. If your TA resonds to the ATI2 command with MTA128ST-USB-RC, V.110
support is not available.
S-register: S77
Function: V.110 Network Rate Control*
Unit: decimal ASCII code
Range: n=1—use $MB (S76),
n=2—use $MB (S76) or Auto Sync on Answer