TSAT 3000 - 3.9.9 MAC_TIMESLOT

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TSAT 3000 - Telemetry and data transfer via SATellite

TSAT 3000 Configuration Parameter Description, January 2013 Page 69 of 124

3.9.8 MAC_TIMESLOT_LENGTH

Read-Only

Read the CURRENT length of a Timeslot in micro-seconds.

See also

PHL_TARGET_UW_POSITION

PHL_SLOT_PHASE_DELAY

3.9.9 MAC_TIMESLOT_MARGIN

Ver <= 30.5.0: Default –1, Range –100.000…+100.000

Ver >= 30.6.0: Default 3000, Range –100.000…+100.000

Set the transmission time for a data packet from CCU to DSP. The MAC_TIMESLOT_MARGIN is

expressed in micro-seconds before the time when the DSP is sending the packet on the satellite

link.

Normally, it’s recommended to use a value of approx. 3000 micro-seconds, as this will give the

CCU a fair change to process the request for Tx-Data, and send them to DSP, in good time

before packet is sent on the satellite link. If this point of time coincides with the point of time CCU

is receiving packets from DSP, another value may be preferred.

RT Ver >= 30.6.0

The minimum

MAC_TIMESLOT_MARGIN) is PHL_INBOUND_GUARDPERIOD + 3000 [us].

This applies when

MAC_TIMESLOT_MARGIN > 0. No restrictions when value is <= 0.

Why minimum value?

To implement the “Local Tx-gain Control” (see

GAIN_TX_REF), it’s necessary to fetch the Tx-

Detector at the point of time when the unit actually is transmitting. Since RT is only

transmitting now and then, it’s important to synchronize the fetching of Tx-Detector to the

sending of packet. This minimum value of

MAC_TIMESLOT_MARGIN will ensure the correct

point of time.

TSAT 3000 - 3.9.9 MAC_TIMESLOT_MARGIN