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4.5.4 Telephone System
Where applicable, standard DPG phone system Summary of telephone cables required:
requirements are: • 4No. 4-pair (or equivalent) from phone
• 5-line group for the main store number system box position to location of BT DP.
• 1 line ADSL enabled for IT link • 8No. CAT-5E cables from phone system box
• 1 line ADSL enabled for CCTV link and position to front counter for handsets etc.
modem, plus Validator safe if installed • 1No. CAT-5E cable from phone system box
• 2 lines for PDQ machines position to drivers table location
• 1 line for security alarm link • 2No. CAT-5E cables from phone system box
position to “wiring only” wall locations (See
As part of the electrical installation, a CAT-5E project drawing for position)
cable from the location of the telephone system • 2No. CAT-5E cables from phone system box
cabinet must be installed to: position to RJ45 sockets in office Comms
• The extension handset positions (typically Cupboard for Caller ID.
7No. in total) • 1No. CAT-5E cable from phone system box
• The modem/CCTV (under counter) position to alarm system location (typically
• The alarm (in office) in the office)
• The PDQ’s machines (2No. typically under • TOTAL = 18 telephone system cables
counter)
• The ADSL (under counter) Telephone system installation engineer is
required to (this list does NOT include CAT-5 and other
Note where BT / ADSL sockets are not within the comms cables which are to be run in addition, as part of the
cabinet the main contractor must run connectors back to computer system):
the comms cabinet location. • Install the telephone system cabinet
complete and terminate the internal
Leaving each of the above in open back boxes, extension lines into it, including identification
the electrician must: of cables and labelling them as necessary
• Lay in 2No. CAT5 cables from the phone • Connect previously laid-in link cables
system cabinet position to the Comms between the BT DP and telephone system.
Cupboard in the office, terminated in RJ45 • Terminate the previously laid cables for BT
sockets in back boxes, for Caller ID. direct lines to the modem, alarm, PDQ’s and
• Lay in 4No. 4-pair cables (min. 16 pairs in total ADSL positions. (NOTE: the alarm line should be
required) from the position of the phone terminated within 1 metre of the alarm box, using a
system cabinet to the position of the BT DP. terminal block with screw terminals)
• In some cases ISDN is installed for the main • Supply and install telephone socket
number lines instead of Analogue lines, if this faceplates to all of the open back boxes
is the case then one CAT5 cable should be installed by the site electrician. All sockets to
provided per circuit. (Please note that there is no be labelled
need to provide a 4-pair cable for each line) Note that to make effective use of space in the counter,
• Leave all cables with identifying labels at the telephone sockets should be of the ‘modular’ type.
BOTH ends.
4.5.4 Telephone System 3 September 2018
