Moin,
am / On 27 Apr 1999 15:56:49 +0200, schrieb / wrote Jonathan NAYLOR
<[EMAIL PROTECTED]>:
>If the mapping was one-to-one between AX.25
>connections and services then we would possibly be OK. But a single AX.25
>connection can carry many things, not just user-to-user data, for example
>multiple NET/ROM, ROSE and TCP/IP sessions.
You mean the AX.25-PID (Protocol-Identifier) may change during a
connection? Thats sounds wrong to me.
A compression on ax.25-level only make sense for data transmitted with
no L3-Protocol (PID=0x0f0). Any other protocol is self responsible for
compression (e.g. VJ for tcp/ip). Otherwise you would e.g. try to
compress header and data together, which would give unsatisfactionary
results (e.g. when using NNTP).
And you always need another pid for such compressed protocols (eg.
0x06 for VJ-TCP/IP or maybe 0xf1 for a compressed NO-Level-3
connection). So there is no need for quirking around with callsigns or
ssid's.
Gruss,
Walter
--
Walter Koch Hochdahl am Neandertal
[EMAIL PROTECTED] ham:dg9ep@db0iz
http://home.pages.de/~dg9ep/ qrv:db0iz-9
