MultiModemISDN User Guide

complete. The PPP Magic-Number Block contains 5 Magic-Numbers in this

 

implementation and is the default type. The Public Switched Network

 

Directory Number option uses Data Directory Number 1 as the Endpoint

 

Discriminator (if it is blank, then Endpoint Discriminator is blank). The

 

Locally Assigned Address (S73=1), IP Address (S73=2), and IEEE 802.1

 

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.

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