Ericsson MINI-LINK BAS, Техническое описание, Страница: 43 / 174

3-7 MINI-LINK BAS
EN/LZB 111 0542 P2B Technical Description
3.2.4 SN connection to CP and EM
The CP is equipped with ATM interface at STM-1 line rate, therefore
can be connected to SNs through ATM virtual connections, is either a
remote or local mode.
In the remote connection mode, the CP is connected to the ATM
backbone network and virtual connection are set up in the ATM
network to reach SN, as shown in the Figure 3–4.
CP can be locally connected to a SN as well. In such a case the CP is
directly connected through an optical fibre to the ET 155 board
housed in the slot 1 of shelves, either R-AAS or C-AAS.
The ET 155 board exploited for CP local connection is no longer
available for traffic.
Only one SN can be managed by the CP local mode because of the
uniqueness of the physical interface.
CPs are connected to EM through an Ethernet interface on an Ethernet
LAN. External device performing Ethernet bridging are needed in
case the EM is remotely located respect the CP.
C-AAS (CE Shelf) or R-AAS
ET155
ATM adapter
CP
slot 1
ATM network
C-AAS (CE Shelf) or R-AAS
ET155
In-band CP communication
channel directly on the STM-1
link
ATM adapter
CP
slot 1
B
A
Figure 3–4 CP-SN Connection through ATM Network
Up to 10 CPs can be managed by an EM. An estimated bandwidth of
128 kbps per CP is needed.