TSAT 3000 - Telemetry and data transfer via SATellite
TSAT 3000 Configuration Parameter Description, January 2013 Page 65 of 124
When enabled on the HUB
, it will reserved SRR_SLOTS (default 8) number of slots to this RT
each time it receives a request for Inbound slots. Maximum
SSR_UNITS (default 8) RTs can
have simultaneous pending requests, and no more than
SRR_MAX_SLOTS (default 127) will be
reserved to each of the RTs for the future. All reserved slots will be released when the RT
doesn’t signal more requests for Inbound slots.
The HUB will signal slot-reservation to all RTs in Outbound packets, but only in those slots
that are allocated for this purpose. You can select “Fixed” or “Random” slot allocation:
• “Random” when
SRR_FIXED is FALSE (default):
The HUB will allocate
SRR_PERCENT (default 50%) semi-random slots.
• “Fixed” when
SRR_FIXED is TRUE:
The slot allocation defined by
MAC_SLOT_MAP_0 [3.9.4] will be used. In this mode, you may
also define the minimum priority of each allocated slot. Slot-value:
• 0 – Not used for slot reservation.
• 1 – Used for slot reservation of all priorities 0…7.
• 2 – Used for slot reservation for priorities 1…7.
• 3 – Used for slot reservation for priorities 2…7.
• 4 – Used for slot reservation for priorities 3…7.
• etc.
All slot-requests for the same
priority are served round-robin (i.e. 1 slot is allocated to each of
the RTs that have requested the same priority. Example:
RT1, RT2, … RTn, RT1, RT2, …).
You can change the order of which the requests with different
priorities are served.
• “Priority Distribution” when
SRR_HIGH_PRIO is FALSE (default):
The HUB will allocate a number of Inbound slots for each requested priority:
• Priority 7 – 32 slots.
• Priority 6 – 20 slots.
• Priority 5 – 12 slots.
• Priority 4 – 8 slots.
• Priority 3 – 5 slots.
• Priority 2 – 3 slots.
• Priority 1 – 2 slots.
• Priority 0 – 1 slot.
• “High Priority First” when SRR_HIGH_PRIO is TRUE:
All high-priority-requests are served before any lower priority requests are served.
Also, some debug options are available on the HUB (see description next page):
• SRR_NO_BUSY_WARN (default OFF)
• SRR_SHOW_REQUEST (default OFF)
• SRR_SHOW_QUEUE (default OFF)
• SRR_TEST_QUEUE (default OFF)
Using the “SRR Facility” will affect the size of Outbound data packets:
Whenever slots are reserved to RTs, the number of bytes available for Application or
Management data in this
Outbound packet is decreased by 2 or 3 bytes:
• 2 bytes when reserving slot to RT 1…255.
• 3 bytes when reserving slot to RT 256…4095.
See also
MAC_SLOT_REQ_RSV_SOURCE and SYS_LICENCE.
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