Preparing for Installation
Cabling & Trunking Requirements - Page 7
Installation & Maintenance
Preparing for Installation - Page 7
INDeX 30
38DHB0002UKDF- Issue 4 (07/2001)
Cabling & Trunking Requirements
The table below shows the maximum cable distances allowed from INDeX 30 to the
MDF, PSTN NTP's or device sockets. If the cabling is already in place, check that it
does not exceed those distances.
Check also that the correct types of cables and sockets have been used and that the
site wiring is clearly labelled. All cables and wires should run through protective
trunking or ducts wherever possible.
Table of Cable Distances
See also "Connecting to the MDF" on page 15.
Cabinet to :
Cable Type
Standard
Cable Length
Maximum
Length
MDF
32 twisted-pair cable
3m
15m
MDF to :
Cable Type
Standard
Cable Length
Maximum
Length
Basic Rate ISDN Type CW1700 (2 twisted pairs)*
800m
Basic Rate ISDN Type CW1308 (2 twisted pairs)*
400m
Phone Socket
Type CW1308 (1 twisted pair)
–
1000m
Two-Wire Socket Type CW1308 (1 twisted pair)
–
2400m
*CAT5 cabling can also be used
IDC Cable Connection Requirements
The INDeX 30 connects to the MDF using an INDeX 32-pair cable. We strongly
recommended that you provide IDC connection points for every cable pair even if
the system does not require all 32 pairs. This allows for system expansion and
maintenance with the minimum cable rewiring.
The INDeX MDF 32-pair cable uses wires with a conductor diameter of 0.4mm (26
AWG).
– In excess of 100 re-terminations of the same wire diameter is possible provided
that an approved IDC tool is always used.
– When new IDC connectors are used it is possible to terminate two wires of the
same diameter in one contact, i.e. 2 x 0.4mm diameter wires.
– It is not acceptable to terminate two wires of different diameters in one contact.
Once an INDeX MDF 32-pair cable wire has been terminated (wires of 0.4mm
diameter), a wire of greater diameter (e.g. A CW1308 with 0.5mm)
must not
be
terminated on top of it, even if only for test purposes. Such an action could result
in poor contact of the smaller wire.
– Once a IDC connector has been terminated with a wire of diameter greater than
0.4mm it cannot be used for an INDeX 32-pair cable wire connection as this will
result in poor contact.
– It is bad practice to use old IDC connectors unless you are certain that only
0.4mm diameter wires have previously been used in them.