TSAT 3000 - PORT_PRIORITY [N]

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TSAT 3000 - Telemetry and data transfer via SATellite

TSAT 3000 Configuration Parameter Description, January 2013 Page 17 of 124

3.1.10 PORT_PRIORITY [n]

Default 3, Range 0…7

Set Priority of User-Data received from this PORT.

• Not Used when PORT_TYPE [n] is SERVICE.

In this case, the packets are assigned following priorities:

Packet Type Priority Note

Management-

Data

LCC_MANAGEMENT_PRIORITY

Some Management packet may be assigned

other priorities.

User-Data <priority>

NMS will initiate and set LOW / HIGH priority:

• LOW => Priority 3.

• HIGH => Priority 5.

• Used when PORT_TYPE [n] is STREAM, ADAPTER or NETWORK.

Received User-Data packet is assigned the

PORT_PRIORITY, and this priority will follow the

packet through the TSAT network, until it’s sent to a PORT.

Value Description Note

0 Very LOW priority

3 LOW priority

LOW priority in NMS is mapped (by NMS) to Priority 3.

5 HIGH priority

HIGH priority in NMS is mapped (by NMS) to Priority 5.

7 Very HIGH priority Default LCC_MANAGEMENT_PRIORITY priority

The packet-priority serves five purposes:

1) Packets will be entered in the Transmission-Queue[0…7], according to packet-priority. Higher-

priority Transmission-Queues will be emptied for transfer to the satellite modem before Lower-

priority Transmission-Queues. See also

LCC_TX_QUE_SIZE.

2) When the total size of all Transmission-Queues (to satellite modem) is about to exceed the

threshold limit, the appropriate PORTs are flow controlled. See also

LCC_TX_QUE_SIZE and

PORT_FLOW_CTRL [n].

3) Packet priority is also used to restrict access to Inbound satellite link from RTs to HUB. See

MAC_SLOT_MAP_{0 | 1 | 2 | 3}.

4) The Port-TX-Queue (to COM or SOCKET) is priority-based when PORT_TYPE [n] is SERVICE.

In this case, Higher-priority packets will be sent to the Interface before Lower-priority packet.