TSAT 3000 - Telemetry and data transfer via SATellite
TSAT 3000 Configuration Parameter Description, January 2013 Page 104 of 124
3.13.7 POW_LISTEN_POLL
Default 0, Range 0…255
Ver <= 31.0.1
Not Used.
Ver >= 31.1.0
During the exchange of
LINK_RESET / LINK_ACK messages, the RT will request the HUB to be
included or excluded from the regular polling of all RTs. Two polling schemes are
implemented:
A) Regular (traditional) Polling:
The HUB will include a request for POLL_ACK packet from
RTs in each
SYNC packet. The RTs are polled cyclic (1, 2, 3, … NET_NO_OF_RTS, 1, 2, 3,
…).
B) Timeout Polling:
The HUB will send a POLL packet to the RTs at regular (configurable)
intervals, and expect a reply (
POLL_ACK) within 3 seconds. The link is reported DOWN
when no reply has been returned after 3 retransmissions. A minimum delay of 5 seconds
is included between each issued
POLL packet.
HUB: This parameter is used when one or more of the RTs have
POW_LISTEN_POLL > zero.
In this case, the total time between two
POLLs to this RT is defined by:
POW_LISTEN_POLL(HUB) x POW_LISTEN_POLL(RT) seconds.
Normally,
POW_LISTEN_POLL(HUB) should be 60, so that the denomination of
POW_LISTEN_POLL(RT) can be given in minutes.
Value Description
0 NOT valid. CURRENT value will always be replaced by 60 (i.e. 1 minute).
1 … 255
Send POLL packets to RTs included in the Timeout polling scheme each
POW_LISTEN_POLL(HUB) x POW_LISTEN_POLL(RT) seconds.
RT: Include or exclude this RT from the Regular (cyclic) polling scheme.
Value Description
0 Include this RT in the Regular polling scheme.
1 … 254
Exclude
this RT from the Regular polling scheme, and request HUB to send a POLL
packet to this RT each
POW_LISTEN_POLL(HUB) x POW_LISTEN_POLL(RT) seconds.
Max timeout is 254 x 255 seconds = 18 hours.
255 Exclude this RT from both the Regular and Timeout polling schemes.
Note 1: When PPR (Pulse Positions Reservation –
PHL_SLOT_PHASE_MODE) is enabled, at
least one
of the RTs in the network should have both POW_LISTEN_HPA_ON and
POW_LISTEN_POLL = 0. That is to ensure that at least some POLL_ACK packets are sent
to HUB in slot-zero.
Note 2: RTs in a Multi-Inbound Link (MIL) network cannot be excluded from the Regular
polling scheme.
Note 3: The HUB will not detect that the link is DOWN when the RT is excluded from both the
Regular and Timeout polling schemes.
Note 4: POW_LISTEN_POLL has no effect when HUB Ver <= 31.0.1.
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