[Sls-slp] Restrictions on Services within TM
tyamada at pub.isas.jaxa.jp
Mon Jul 27 07:39:22 UTC 2009
> Can any of you help provide the rationale as to why these
> restrictions on services in the current CCSDS TM Space Data Link
> Protocol book exist?
> a) if the Master Channel Frame Service exists on a Master
> Channel, other
> services shall not exist simultaneously on that Master Channel;
> c) if the Virtual Channel Frame Service exists on a Virtual
> other services shall not exist simultaneously on that Virtual Channel;
The Master/Virtual Channel Service is a very special service in the
sense that no other protocol has such a service.
From 220.127.116.11 and 18.104.22.168 of the same book, "The Master/Virtual
Channel Frame (MCF/VCF) Service provides transfer of a sequence of
fixed-length TM Transfer Frames of a Master/Virtual Channel, created
by an independent protocol entity, across a space link."
If other services are to be used on that Master/Virtual Channel, the
"independent protocol entity" (mentioned above) should provide these
services. Therefore, the service provider in question should not
provide any other services on the same Master/Virtual Channel.
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