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<h1>Satellite Abis</h1>

<p>This feature enables the operator to create coverage of
the network in areas where the coverage could not be otherwise implemented
due to the limitation of transmission media. Only a minimum number of equipment
is required at the remote cells. The feature can be utilised either on the
Abis or Ater interface.</p>


<p>To support satellite BSC-BTS circuits, this feature enables
a connection of BTSs to a BSC over a transmission path having long delay (about
280 ms in one direction).</p>


<p>BSC and BTS parameters and timers are adapted for long
delay. To modify the time alignment procedure between the TCSM1 and BTS, different
proms in the TCSM1 are used. In the TCSM2, the time alignment can be turned
off from the command menu. To activate this feature, the parameter on/off
per BSC is enabled. Because of the fixed MS timers, there may be re-attempts
in the signalling, causing limitations to the capacity of these cells. Obviously,
the GSM delay specification cannot be met, but that does not mean any functional
harm as such for the system.</p>
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