S Registers
39
S27
Bit-mapped. V.25ter not enabled. Storable.
Bit 3,1,0. Communication mode (&Q, \N CMD)
■
0 = Normal asynchronous
■
1 = Sync mode 1
■
2 = Sync mode 2
■
3 = Sync mode 3
■
4 = Direct
■
5 = MNP
■
6 = MNP/V.42
■
7 = V.42
■
V.25ter enabled
Bit 3. Not used
■
Bits 1-0. Communication mode (&Q, \N command). 1 = Lease line
■
00 use S36 communication mode setting
■
01 synchronous mode 1
■
10 synchronous mode 2
■
11 synchronous mode 3
Bit 2. Leased line (&L CMD)
■
0 =GSTN
Bit 5,4. Synchronous transmit clock source (&X CMD)
■
0 = Internal
■
1 = External
■
2 = Derive from receiver (slave)
Bit 6. Bell / CCITT (B CMD)
■
0 = CCITT
■
1 = Bell
Bit 7. Reserved
S28
Bit-mapped. Storable.
Bit 1,0. Error Correction Maximum Block Size (\A CMD)
■
0 = 64 bytes
■
2 = 192 bytes
■
1 = 128 bytes
■
3 = 256 bytes
Bit 6,5,4,3,2. V.42 detection period (T400) in 50 milliseconds increments (%G CMD)
■
0 = Infinite
■
1 to 155 = number times.05 second
Default = 16 for.8 seconds
Bit 7. ODP/ADP (&A CMD)
■
0 = Do not use ODP/ADP when initiating a reliable V.42 handshake
■
1 = Use ODP/ADP when initiating a reliable V.42 handshake
