Appendix D: S-Register List

S22.......MSG BITS

Miscellaneous message bits (bit 8 is most significant

 

bit).

 

Bit 5 = bit 6 = bit 7 = 1 allows connect message with

 

baud rate.

 

Bit 5 = bit 6 = bit 7 = 0 connect message without baud

 

rate.

S23.......MAKE BUSY

Number assigned by the telephone company when

FEATURE BUTTON requested by user. Make Busy option is translated for

NUMBER

an ISDN line and the feature button number must be

 

entered into this S register. Useful for Hunt-Group

 

operation.

 

Range = 0 to 255

 

0 is default.

S24.......V.120

Value determines whether or not the V.120 bit is set

LOW LAYER COMP.

in setup messages for CCITT V.120 calls. Some terminal

 

adapters require that this bit be set to connect V.120

 

calls.

 

0

= Set V.120 bit in call setup message (default)

 

1

= Do not set V.120 bit in call setup message

S25.......DTR DELAY

Value determines the minimum time a change of state

 

on DTR must last before the unit responds. The value

 

is in hundredths of seconds.

 

Range = 0 to 255

 

5 is default (50 milliseconds)

S26.......DTE RATE ADJUST

Determines CLEAR CHAN protocol automatically re-

 

ducing DTE RATE for non-64K call types.

 

0

= CLEAR CHAN changes DTE rate from 64K to

 

56K for non-64K call types (default).

 

1

= CLEAR CHAN does not change DTE rate from

 

64K to 56K for non-64K call types.

S27.......PPP MODE

Value determines whether PPP will be a single-link or

 

multilink connection.

 

0

= Single-link operation (default)

 

1

= Multi-link operation

 

2

= Use compression

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ADTRAN ISU 2X64 user manual Number, LOW Layer Comp, S26.......DTE Rate Adjust