[Sls-slp] Restrictions on Services within TM

[Takahiro Yamada]

Greg,

> 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  
> Channel,
> 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 2.2.3.6 and 2.2.3.9 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.

Best regards,
Takahiro Yamada.