Siemens BS-240 Technical Description page 16

Technical Description (TED:BSS)
BS-240/241
AC/DC AC/DC converter
ACP AC Panel
ACTC Alarm Collection Terminal Connection module
ACTM Optional Alarm Collection Terminal for Master Rack DUAMCO
ACTP Alarm Collection Terminal for Slave Rack
CAN Controller Area Network
COBA Core Basis (COBA2P8)
COSA Core Satellite (COSA6P16)
CU Carrier Unit
16
The architecture of BS-240/241 provides maximum flexibility to develop large and small
BTSs.
The BS-240/241 mainly consists of:
– carrier oriented boards called carrier unit (CU),
– core boards (COSA, COBA) and
– combining equipment
Up to 8 PCM lines can be connected to the core boards. In order to provide cost effective
solutions, the core boards are scalable (COBA, COSA). In addition, also the BTS itself
is scalable. It is possible to connect up to 2 Extension Racks to a Base Rack.
The main communication between the modules is provided by means of bi-directional
serial link communications between the carrier units (CU) and the core boards. The
serial link also provides an effective means to realize baseband frequency hopping.
Despite the fact that synchronization information is also transported via the serial links,
no differential length constraints apply for the lines of the serial link.
All alarms, beside the alarms that are generated in the core and in the CU boards, are
transported via the CAN bus. Alarms of the CU boards are transmitted via CC-Link. Core
boards use their interface bus.
The carrier unit(s) provide all analog and digital signal processing including a RF power
stage necessary to process a single carrier (e.g., GSM 8 TCHs). The carrier unit(s) inter-
face with the combining equipment on the one side and with the core modules on the
other. The core boards provide functions common to all carriers within the BS-240/241
(e.g., clock generation, O&M processing,...) as well as LAPD processing for the different
carriers.
DCBCTRL DC and Battery Controller
DCP DC Panel
DIAMCO DI(2) Amplifier Multi Coupler
Duplex Amplifier Multicoupler
FICOM Filter Combiner
HPDU High Power Duplexer
LE Link Equipment
TMA Tower Mounted Amplifier
A30808-X3247-L14-2-7618
Information
Base Station System