User Manual

Axell Wireless Limited
Technical Literature
Dual Band Fiber Fed BDA 60-232301
Document Number
60
-
232301HBK
Issue No.
2
Date
22
/
12
/
2009
Page
10
of
35
One path is fed to the F/O Transceiver Module J1361001 (annotated “R” in sections 3.6.4. & 3.6.5.)
for the primary optical link. The F/O Transceiver Module modulates the RF signal onto a laser and the
primary optical uplink exits the BDA for the master site via the SC/APC optical port annotated “T” in
sections 3.6.4. & 3.6.5.
The second branch of the Uplink path is fed to the F/O Transceiver Module J1361001 (annotated “S”
in sections 3.6.4. & 3.6.5.) for the secondary optical link. The F/O Transceiver Module modulates the
RF signal onto a laser and the secondary optical uplink exits the BDA for the master site via the
SC/APC optical port annotated “U” in sections 3.6.4. & 3.6.5.
Dual Band Fibre Fed BDA 60-232301 is powered by an AC input of 115V which drives a pair of
identical 600Watt PSU modules connected via power combining diodes in a dual redundant
configuration to provide a 24V DC supply which in turn is used to feed a pair of DC/DC convertors the
12V outputs of which are similarly combined via diodes. The 12V DC supply is then further modified
by a multi-voltage converter to provide a range of DC voltages to power the active modules within the
BDA
A comprehensive alarm system is fitted; all the amplifier, fibre optic and PSU modules carry their own
voltage-free contact alarm relay outputs which are fed to and collated by a control PCB, the Generic
Interface Board Assembly 17-020001 (annotated “L” in section 3.6.6.); from here alarm data is fed to
the F/O Transceiver Modules and modulated onto the Uplink optical signal to be demodulated at the
BTS. A summary alarm output is also present at the terminal block (terminals 7 & 8) (annotated “L” in
section 3.6.1.) on the front face of the External Alarm and Battery Module J1161030 (annotated “K” in
section 3.6.1.) The summary output is then fed to the 6 pole panel plug labelled “ALARM” (annotated
“D” in section 3.5.) on the side of the case.
Two ports are provided where an operator may connect into the system using a laptop PC running
suitable terminal-emulation software to interrogate the control PCB to gain access to alarm
information and to configure the equipment. A local serial port, (a 9 way “D” panel socket annotated
“J” in section 3.6.1.) and an RJ45 Ethernet port (annotated “I” in section 3.6.1.)
Control data from the BTS for the AGC system are modulated onto the optical Downlink signal and
demodulated by the F/O Transceiver Modules to be fed to the control PCB.