S36 - Negotiation Failure Treatment

Type
bit-mapped

Value range
0-7, Default value: 7

Stored by &Wn
yes

Displayed by &V
yes

Description
When an error-control connection cannot be negotiated between the two modems, this register indicates operation mode the modem will use. Note that if negotiation is disabled (S48=128), these fallback options will be initiated immediately. In products supporting MNP 5, which class negotiated is determined by the setting in S46. Bit 2 of that register is the master compression bit which if on (values 2,3,138) will result in MNP Class 5 negotiation and if off (values 0,1,136) will result in MNP Class 4 negotiation.

Bit Map
Bit Description


0   0=hangup,                                             

    1=fall back according to bit 1                        

1   0=direct async,                                       

    1=first try ASB                                       

2   0=do not try MNP,                                     

    1=first try MNP then according to bits 0 and 1.       

3   reserved                                              

4   reserved                                              

5   reserved                                              

6   reserved                                              

7   reserved

Value Meanings

S36    First Choice       Second Choice          

0      Hang-up            N/A                    

1      Async              Hang-up                

2      Hang-up            N/A                    

3      Buffered Async     Hang-up                

4      MNP                Hang-up                

5      MNP                Async                  

6      MNP                Hang-up                

7      MNP                Buffered Async

In asynchronous mode, the modem returns the CONNECT XXXX message after a successful connection. This message indicates the speed of the connection, which is also the speed of data transmitted from DTE to modem.

Note: The selected fallback option can be initiated immediately with S48. For example, a connection attempt using the Alternative Protocol can be forced by setting S48=128 and S36=5 or 7.

The Bit Map table shows the order in which the bits of S36 are evaluated: (Remember, these steps occur after the S46/S48 selections fail to make a Link Access Protocol Balanced (LAPB) based error-controlled connection in &Q5 mode.)

Cross Reference
S48 Feature Negotiation Action

S46 Protocol Selection

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