User Manual

Cabinet description
Nortel Networks Confidential
1–138
PE/DCL/DD/0063
411–9001–063
Standard 12.07/EN September 2000
GSM/BSS V12
Interface between the PCU and the ALCO or RECAL board
The following signals are the interface between the PCU and the ALCO or RECAL
board:
Load1 threshold (PCU internal alarm, also sent to ALCO or RECAL)
PCU protective devices (PCU internal alarm, also sent to ALCO or RECAL)
battery on discharge (alarm) available only for the S8000 Outdoor BTS
dc fault (alarm)
ac fault (alarm)
overtemperature (alarm).
The following signal carries out the control:
CEATS 1 (Cabinet Extreme Ambient Temperature Signal).
The following cables are not connected:
Load2 threshold (PCU internal alarm, also sent to ALCO or RECAL)
missing module (alarm)
remote control (used to cut the 48 V dc and switch to batteries)
common alarms.
Battery operation of boards in the cabinet (only for the S8000 Outdoor BTS)
The PCU enables the cabinet to run on either internal or external batteries
(connection of the internal or external batteries is carried out manually, and it is not
possible to connect both types simultaneously). Two operating options are possible.
option 1:
• When the internal or external batteries are connected to the system, the SRU
powers all the outputs and, if necessary, supplies power to the batteries
(charging phase).
• If the SRU is not supplying any power, the internal or external batteries
energize output 4 (BCF, user equipment and ALCO or RECAL board).
option 2:
• When the external batteries are connected (in which case the internal batteries
are disconnected manually), the SRU energizes all the outputs and, if
necessary, supplies power to the batteries (charging phase).
• If the SRU is not supplying any power, the external or internal batteries
energize all the outputs.
When the SRU, for any reason, stops supplying dc voltage, the batteries are the only
possible dc power supply.