Dc And Battery Controller (Dcbctrl); Overvoltage Protection And Tracer (Ovpt); Abis Connection Module (Abiscon) - Siemens BS-240 Technical Description

Information
Base Station System
3.12.1
3.13
3.14
A30808-X3247-L14-2-7618
The AC/DC tasks are:
– output supplying all -48V-consumers within the BS-240/241; input supplying of 230V
AC 1 phase system for the world market and 208V AC 2 phase system (208V phase
to phase) for the US market.
– supplying external equipment with -48V
– charging and supervising of different battery backup types with different capacities
and up to two battery backup systems per Service Rack/Shelter
– supervising rectifiers, batteries and alarm messaging
– switching off DC outputs (rectifiers as well as battery) in case of under and over
temperature
– hot plug in/out
– operation of two Frames in parallel
The AC/DC and the backup batteries work as an Uninterruptable Power Supply System
(UPS).

DC and Battery Controller (DCBCTRL)

The DC and Battery Controller is the supervision unit for the AC/DC Converters installed
in the Frame AC/DC and for the Batteries charging of this set of AC/DCs. The DCBCTRL
has a dip switch device to adjust the frame address AC/DC frame 1 or AC/DC frame 2
and the battery capacities of the connected battery system.

Overvoltage Protection and Tracer (OVPT)

The OVPT is responsible for lightning protection of the PCM24/PCM30 ports of the Abis
interface and the external synchronization clock input of the BS-240/241 against over
voltage. Additionally, the OVPT provides interfaces to connect PCM tracers without
interruption for monitoring the Abis lines. The OVPT is located outside the EMI shield in
order to terminate possible overvoltages before it enters the EMI protected area inside
the Rack.
The board performs the following tasks:
– lightning protection of PCM lines
– lightning protection of the ext. synchronisation clock
– provision to connect ext. monitoring equipment without interruption. The lines are
de-coupled by resistors in order to prevent distortions.
supporting 75 Ω coax and 100 Ω/120 Ω symmetrical lines
–
for 75 Ω coax only a second version of the OVPT is available
–
– provides grounding facility for the external cable shielding
– provides stress relieve for the external cables

Abis Connection Module (ABISCON)

The Abis Connection module provides the interface between the base cabinet and the
peripheral Abis-cables. The Abis Connection module also provides the feature for moni-
toring the Abis lines and serves as interface for external synchronisation clock.
The type of Abis Connector depends on the used cable for the Abis interface
•
symmetrical lines with 100/120 Ohm impedance
•
coaxial lines 75 Ohm impedance
Technical Description (TED:BSS)
BS-240/241
41