[Sls-slp] Restrictions on Services within TM

[Greenberg, Edward (313B)]

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:

All,

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 Perhaps these restrictions are no longer valid?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,

Greg Kazz
Chairman CCSDS SLS-SLP WG



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