User's Manual

Selex ES S.p.A.
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by Selex ES S.p.A. in writing
54
8.1.3 Digital Interface module – DIF
The "Digital Interface” (DIF) module is the module that is able to manage up to 4 digital E1
streams. This module is equipped with devices for numerical computation (DSP, FPGA) and
control (microprocessor) combined with the electrical interfaces for the E1 streams.
The DIF module is also able to provide cross-connect and add / drop functionality over the 4
E1 streams.
The DIF module is the digital interface of the RBS with the outside world. As already said it
handles the digital aggregated flows (compliant to E1 G.703/G704 standard). These link are
used to carry voice and data information to / from other RBS to build a Simulcast network.
The device makes use of one of the 30 channels (64 kbit/s) available in a 2,048 Mb/s E1 for
communications with other RBS and makes them available inside the station. The module
has also the cross-connect and add / drop functionalities, being able to redirect all the 120 channels
according to a predetermined matrix.
The front panel is provided with bi-color leds to help in troubleshooting the system. The table below
describes the meaning of the leds:
LED
Color
Label
Description
1
Green
E1/T1 1
E1/T1 #1 link enabled and correctly operating
Red
Fail 1
E1/T1 #1 link enabled and LOS alarm is present
Red blink
Fail 1
E1/T1 #1 link enabled and LOF or LOFAS or BER > FW defined threshold
alarm is present
2
Green
blink
S1
E1/T1 #1 used as sync reference
Red
Rem fail 1
E1/T1 #1 link enabled and AIS alarm is present
Red blink
Rem fail 1
E1/T1 #1 link enabled and RAI or RAI-AS alarm is present
3
Green
E1/T1 2
E1/T1 #2 link enabled and correctly operating
Red
Fail 2
E1/T1 #2 link enabled and LOS alarm is present
Red blink
Fail 2
E1/T1 #2 link enabled and LOF or LOFAS or BER > FW defined threshold
alarm is present
4
Green
blink
S2
E1/T1 #2 used as sync reference
Red
Rem fail 2
E1/T1 #2 link enabled and AIS alarm is present
Red blink
Rem fail 2
E1/T1 #2 link enabled and RAI or RAI-AS alarm is present
5
Green
E1/T1 3
E1/T1 #3 link enabled and correctly operating
Red
Fail 3
E1/T1 #3 link enabled and LOS alarm is present
Red blink
Fail 3
E1/T1 #3 link enabled and LOF or LOFAS or BER > FW defined threshold
alarm is present
6
Green
blink
S3
E1/T1 #3 used as sync reference
Red
Rem fail 3
E1/T1 #3 link enabled and AIS alarm is present
Red blink
Rem fail 3
E1/T1 #3 link enabled and RAI or RAI-AS alarm is present
7
Green
E1/T1 4
E1/T1 #4 link enabled and correctly operating