Ericsson MINI-LINK BAS, Technical Description, Page: 33 / 174

2-11 MINI-LINK BAS
EN/LZB 111 0542 P2B Technical Description
2.2.3 C-AAS
C-AAS is aimed to host CE terminations towards PSTN. C-AAS is
mostly equipped with CE-SNI boards.
The C-AAS has 19 board slots which usage is report below:
Slot 1: ET boards
Slots 2-17: CE boards or ET boards
Slots 18-19: Two redundant power supplies, operating in load sharing
mode
The ET board, in slot 1, shall be always present as performs Cellbus
arbitration. Typical configuration foresees one ET board, for
connection toward R-AAS or backbone network and up to 16 CE-SNI
boards for connection toward PSTN.
Other configurations, with a greater number of ET boards, are
allowed.
The C-AAS provides an ATM cross-connect functionality through
Cellbus, as in R-AAS.
2.2.4 Control and Management
2.2.4.1 CP
The CP constitutes the agent that carries out all of the EM User
commands, acts as the repository for the system database, and
oversees control of the overall system. It is a UNIX based shelf
mounted processor. CP can be either co-located with the R-AAS,
C-AAS or at a remote location.
The CP is physically connected through a SDH/SONET link at OC-
3/STM-1 Rate. The ATM switch multiplexes the CP control message
traffic and subscriber traffic together for interfacing to the ET155
boards.
It is possible to connect the CP either to each C-AAS (CE Shelf) or R-
AAS shelf using ATM connection or directly to ET in slot 1.
One CP can control a number of shelves, C-AAS (CE Shelf) and R-
AAS, and their subtended equipment, that are radios and ATs.
2.2.4.2 EM
The EM operates on a standalone UNIX based workstation. The EM
interfaces to the CP using a 10BaseT connection. One EM can manage
shelves controlled by several CPs.
The EM can be co-located or remote from the CP that it manages.