TSAT 3000 - Telemetry and data transfer via SATellite
TSAT 3000 Configuration Parameter Description, January 2013 Page 79 of 124
The “Secure Link Facility” (
PORT_MAX_APPL_RETRIES [n] > 0) is normally used together with
the “Pulse Position Reservation Facility”, at least on the Inbound link. (It is not necessary on
the Outbound link). Otherwise, the TSAT network cannot guarantee the correct reception-
order of Inbound packets from the RTs. Packets may also be lost due to collisions (or other
reasons), even though most of the collided packet will be retransmitted by the PPR protocol.
The PPR functions are controlled by PHL_SLOT_PHASE_MODE, which is interpreted as
follows:
Bits Field Value Mnemonic Description
0 – 2 0x0000.0007 0 – 7 STRATEGY
RT: Define the position at which packets are sent to HUB.
3 0x0000.0008 0 – 1 TEST_1 Disable PPR retransmissions.
4 – 7 0x0000.00F0 0 – 15 PULSES Number of pulse positions. Enable/disable “PPR Facility”.
8 – 11 0x0000.0F00 0 – 15 SEPARATION Number of symbols separating each position.
12 0x0000.1000 0 – 1 TEST_2
HUB: Detect position strategy.
12 – 14 0x0000.6000 0 RESERVED_1 Reserved. Should be zero.
15 0x0000.8000 0 – 1 TEST_3
HUB: Show all position bits.
16 – 19 0x000F.0000 0 – 15 FIXED_POS
RT: Define fixed position.
20 – 23 0x00F0.0000 0 – 15 REPEAT
RT: Repeat test pattern a number of slots.
24 – 31 0xFF00.0000 0 RESERVED_2 Reserved. Should be zero.
The options may also be visualised as:
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
RESERVED REPEAT FIXED POS T3 RSRVD T2 SEPARATION PULSES T1 STRATEGY
0 0…15 times 0…15 positions 0 / 1 0 0 / 1 2…15 symbols 2…15 pulses 0 / 1 0…7
Normally,
PHL_SLOT_PHASE_MODE = 0x0470 is used (i.e: PULSES = 7, SEPARATION = 4,
STRATEGY = 0).
PHL_SLOT_PHASE_MODE = 0x0471 (i.e: STRATEGY = 1) should preferable be used in smaller
networks with less or equal 7 RTs.
Messages from PPR functions may be enabled by bit 4 (0x0010 –
DEBUG_PPR) in
UTL_DEBUG_MASK.
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