Re: X.25 Negotiation

John Leong (
Wed, 27 Aug 86 18:12:21 edt


Officially, it is possible to negotiate for non-standard default size in the
Call Request Packet (see section on Procedure and Formats for optional user
facilities). In practice, most administration will limit you to either 128 or
256 bytes in order to achieve better resource ultilisation of the packet
switching node. This effectively makes size negotiation pretty mieaningless.
Of course if you are running TP-4 on top of X25, you can do TPDU size
negotiation. If your TPDU size is greater than the NPDU size, then you have
to do network level fragmentation and set M-bit in your X25 packet

John Leong

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