40(48)
Date
Rev
Documentnumber
Prepared
Doc respons/Approved
Checked
Reference
1999-07-15
A
1531-BDV BS 101 05 Uen
INSTALLATION INSTRUCTION
Subject responsible
8
LINE NETWORK
The line network for PBX-extensions is to be installed in accordance with the stipulations for standard telephone
networks. Twisted pair cables must be used for the lines and a wire diameter of 0.5 mm is recommended in order to
reach full line length, i.e. 800 m.
No stubs and/or branches may exist on digital extension lines, as they could cause transmission problems.
•
In case a separate Ericsson MDF has to be installed, prefabricated cables are used between the MDF and
board connectors in the exchange cabinet. These cables have EURO-connectors mounted at one end for
connection to the board.
For connection of ELU-A, ELU-D, ELU-D3, MFU, BTU-A, BTU-C or BTU-E to the MDF use the following cable:
•
TSR BS 902 0001/800 is terminated on the board side with standard Ericsson connectors and Krone
connectors on the other side.
•
TSR 902 0472/3 (length = 6 m) is equipped with a connector only at the exchange side
•
TSR 901 0472/2 (length = 15 m) is equipped with a connector only at the exchange side
For connection of BTU-D, use the following cable:
•
TSR 225 1304/20000, 75
Ω
coaxial cable
•
or use the same cable as for BTU-A for 120
Ω
connection or a double shielded cable TSR 901 0481/20000
(adhere to local requirements).
The cables run into the exchange from below the cabinet. The cables from the line network are led directly to the
MDF in the exchange cabinet. Secure the cables to the exchange cabinet with the adhesive anchors and tie wraps.
Place the cables according to the figure.
NOTE:
There must be a connection to earth for the MDF cabinet when surge protectors are installed.
Cables from
line network
Earth
Alternative
of cables to
connections
board
Alternative
connections
of cables from
line network
connection
Primarily intended
for trunkline use
Cable for board
connection
(with surge protectors)
