DIGIMINI AMERICAS REPEATERS
PRODUCT DESCRIPTION AND USER’S MANUAL
Cobham Wireless – Coverage Date: 6-Jul-17 www.cobham.com/wireless
Document number: 00031UM Rev. 6.3
Page |5-8
5.3.1 RF Gain Setting Criteria
The RF Gain is set automatically by the Repeater’s SALC function. The function sets the optimum gain
without exceeding the isolation limit.
The gain range is up to 73dB for
all bands
and is set by default to its maximum value.
The gain will then be modified automatically to its optimum value by the SALC mechanism.
This mechanism
performs gradual learning of traffic load characteristics and adjusts the Repeater RF Gain accordingly. (See
section
1.2 for more information on the SALC mechanism).
5.3.2 Bandwidth and the Number of Available Sub-Bands
Each repeater supports up to two bands, where a maximum total e
ight sub-bands
may be defined for both
bands (e.g. two sub-bands for one band and six sub-bands for the other band).
NOTE: Since some sub-bands require more resources, less than eight sub-bands may be available.
The sub-bands are available resources are listed in the Band Info tab of the repeater.
This section provides a general description of the sub-band resource allocation as well as the Band Info tab.
5.3.2.1 Sub-band Resource Allocation
A maximum e
ight sub-bands
may be defined per repeater (single- or dual-band). The number of available
sub-bands or channels depends on the technology and selected bandwidth as detailed below (note that
some bandwidths (e.g. 15 or 20MHz at 1900MHz WCDMA) take up two channel resources).
The following table summarizes the number of available sub-band resources under various configurations.
Technology Filter BW Resources
GSM 200KHz – 11MHz
(in 200KHz steps)
1
GSM 11.2MHz – 20MHz
( in 200KHz steps)
2
WCDMA 5MHz, 10MHz 1
WCDMA 15MHz, 20MHz 2
LTE
10MHz
1
LTE 15MHz, 20MHz 2
5.3.2.2 Band Information Window
The band information window provides general information on the repeater; this includes, Serial Number,
Build versions, System ID (used when acquiring license files) and resources available for various filters.
To access the Band Information window
1. From the Tree Pane, select the band item in the tree (e.g. 900-2100).
2. Select the Band Info tab. The relevant parameters are displayed.
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