DIGIMINI EMEA/APAC/AUSTRALIA REPEATERS
PRODUCT DESCRIPTION AND USER’S MANUAL
www.cobham.com/wireless
Page |
5-8
Date: 11-Oct-15
Rev. 5.0
Cobham Wireless –
Coverage
Document number: 00030UMCD
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
1.3 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). For example, for a
dual-band repeater supporting bands 900MHz and 2100MHz, 4 sub-bands may be set for the 900MHz
band and 4 sub-bands for the 2100MHz band, with a total sum of 8 sub-bands).
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 900MHz WCDMA) take up two
channel resources).
Frequency
Technology
Bandwidth
No. of
Sub-band Resources
850/900/1800/2100/2600MHz
LTE
1.4, 3, 5, 10 MHz
1
850/900/1800/2100/2600MHz
LTE
15,20, 25 MHz
2
850MHz, 900MHz, 1800MHz
GSM
200Khz-9,800Khz
(in 200KHz steps)
1
850MHz, 900MHz, 1800MHz
GSM
10 to 25 MHz
( in 200KHz steps)
2
850MHz, 900MHz, 2100MHz
WCDMA
5, 10MHz
1
850MHz, 900MHz, 2100MHz
WCDMA
15, 20, 25MHz
2
