[stuff about Rockwells vs Couriers deleted...]
 
 IS> "9.2.3  Maximum number of octets in an information field (N401)

 IS> N401 governs the maximum number of octets that can be carried in the 
 IS> information field of an I frame, an XID frame, a UI 
 IS> frame, or a TEST frame transmitted by an error-
 IS> correcting entity.  The default value of N401 shall 
 IS> be 128 octets for both directions of data 
 IS> transmission.  If the default is not satisfactory 
 IS> to the negotiation initiator, then a different 
 IS> value may be negotiated separately for each 
 IS> direction by use of the XID frame.  The initiator 
 IS> of the negotiation shall indicate the N401 value it 
 IS> wishes to use for each direction (absence of a 
 IS> value indicates use of the default).  The responder 
 IS> to the negotiation indicates the N401 value it 
 IS> wishes to use for each direction.  The value chosen 
 IS> by the responder shall be between the value chosen 
 IS> by the initiator and the default value, inclusive, 
 IS> and shall be the value used during the operation of 
 IS> the error-corrected connection (unless overridden 
 IS> by a subsequent negotiation)."
 
Ok,  my modem can tell me this stuff, so what is it saying?
 
Netcomm 336 to Austel Courier:
 
XID tx:  TEST max info tx =256 max info rx=256 tx win=15 rx win=6
XID rx: 82800013 Options:  RN401 244 TN401 244 RK 15 >> 6 TK 6
V42bis P1:2048 V42bis P2:32
SABME tx
UA rx
Terminal      : 115200  8 data bits  No Parity
Line          : 28800  V.34 (3200baud Pre-emphasis Filter: 8
Resolution EQM: 125-125<154<271<450)
Error Correct : LAPM
Compression   : V.42bis 2048 32 tx/rx
...
 
Netcomm 336 to Netcomm 336:
 
XID tx:  TEST max info tx =256 max info rx=256 tx win=15 rx win=6
XID rx: 82800013 Options:  TEST  RN401 256 TN401 256 RK 6 TK 6
V42bis P1:8192 V42bis P2:250

--- Maximus 3.01