Parameter Summary - ND SatCom SKYWAN IDU 7000 Manual

General Carrier Design
TDMA Carrier Design with 'TDMA Calculator'
'Roll-off factor': Minimum distance between two SkyWAN
culate the frequency bandwidth of a carrier:
frequency bandwidth = symbol rate * (1 + roll-off factor).
2.6.1.1

Parameter Summary

Parameter Name
Minimum TDMA frame time
[ms]
Number of uplink populations
Masterstation with self recep-
tion
Size of uplink population 1
[stations]
Size of uplink population 2
[stations]
Number of frequency chan-
nels
58
Definition
In a SkyWAN network the master sends control communication (e.g.
capacity allocation) to slave stations within the reference burst. The
time between two reference burst TDMA slots is called TDMA frame
time.
Slave stations transmit their request burst on a defined trans-
mit (Tx) carrier to the master. All stations using the same 're-
quest burst carrier' belong to the same 'Uplink Population'
(ULP).
- Select 1 to define one ULP using carrier 1.
- Select 2 if a cross-strapped satellite transponder is used
(Dual Uplink Mode - DUB) a second ULP has to be defined
using carrier 2.
MRB and MRB-DUB mode both require a master able to receive its
own reference burst. If this self-reception is not possible, NFB-DUB
mode has to be configured.
- 'YES': MRB-DUB mode: 2 Uplink Populations, 2 to 7
Downlink Populations.
- 'No': NFB_DUB mode. max. 2 Uplink Populations, 1
Downlink Population; Star topology only.
Quantity of stations belonging to Uplink Population 1.
- MRB, MRB-DUB mode: Max. network size 510 stations
(ULP 1 + ULP 2).
- NFB-DUB mode: max. 255 stations.
Quantity of stations belonging to Uplink Population 2.
- MRB, MRB-DUB mode: Max. network size 510 stations
(ULP 1 + ULP 2).
- NFB-DUB mode: max. 255 stations.
Quantity of frequency channels to use.
- MRB mode: 1 - 8
- MRB-DUB mode: 2 - 8
- NFB-DUB mode: 2 or 3
Network Design and Engineering Guide
®
carriers. This value is used to cal-
2010-10-26