Connection of External Cables
6 Connection of External Cables
6.1 General
Cabling to the MDF uses prefabricated cables.
Twisted, shielded, pair-cables are to be used for cabling between the PBX and
MDF or PBX and PBX (LIM - LIM).
For more information about cables see Page 17, see Section 5.8 Extension
Cable Structure on page 110, and for extensions see the subsections in this
section.
The cable length from the exchange to the MDF shall not be shorter than 3
metres (118 inches).
6.2 Line Lengths
ELU26
The following three connection alternatives are based
on the usage of a 75 ohm twisted pair cable, 120 nF/km
and wire 0.6 mm or a 150 ohm twisted pair cable, 30
nF/km and wire 0.6 mm or 125 ohm/km DC.
• 1000 m, point-to-point with one terminal.
• 500 m, extended passive bus with 8 terminals.
• 100 m, short passive bus with 8 terminals.
ELU33
600 m if using a twisted pair cable with wire diameter
0.4 mm.
1000 m if using a twisted pair cable with wire diameter
0.5 mm, point-to-point with one terminal.
ELU34
6000 m if using a twisted pair cable with wire diameter
0.4 mm.
9000 m if using a twisted pair cable with wire diameter
0.5 mm.
ELU34/2
6000 m if using a twisted pair cable with wire diameter
0.4 mm.
9000 m if using a twisted pair cable with wire diameter
0.5 mm.
TLU75
5000 m if using a twisted pair cable with wire diameter
0.4 mm.
8000 m if using a twisted pair cable with wire diameter
0.5 mm.
117
6/1531-ASP 113 01 Uen J2 2008-07-17
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