[Sls-slp] Restrictions on Services within TM
Greenberg, Edward (313B)
edward.greenberg at jpl.nasa.gov
Thu Jul 23 19:51:33 UTC 2009
Greg, B) and D) are there because they are exclusive. In other words you can't have Packet service and VCA service on the same VC but I too don't understand the other restrictions.
On 7/23/09 10:38 AM, "Kazz, Greg J (313B)" <greg.j.kazz at jpl.nasa.gov> wrote:
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? I am having a difficult time in trying to come up with such a rationale. Perhaps these restrictions are no longer valid?
The text below is copied from section 2.2.4 of the current CCSDS TM Space Data Link Protocol book:
Restrictions on Services
There are some restrictions on the services provided on a Physical Channel:
a) if the Master Channel Frame Service exists on a Master Channel, other
services shall not exist simultaneously on that Master Channel;
b) on one Master Channel, the Virtual Channel Operational Control Field
Service shall not exist simultaneously with the Master Channel Operational Control Field Service;
c) if the Virtual Channel Frame Service exists on a Virtual Channel,
other services shall not exist simultaneously on that Virtual Channel;
d) on one Virtual Channel, the Virtual Channel Packet (VCP) Service shall
not exist simultaneously with the Virtual Channel Access Service.
thanks and best regards,
Chairman CCSDS SLS-SLP WG
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