Specifications

Chapter 5: Installation
Running Cables to Endpoints
Page 5-62 Mitel
®
5000 Installation Manual – Issue 3.0, October 2008
Running Cables to Endpoints
Carry out the following guidelines when running cable for digital endpoints:
• Develop floor plans to aid in proper digital endpoint cabling in a star (home run)
configuration from the DEI chassis. If necessary, run the necessary cabling to where the
digital endpoint will be used. See “Cabling to Endpoints” on page 4-12.
• If desired, two- or three-pair twisted cable and four- or six-conductor modular jacks [line
jack units] may be used for all endpoint connections. This allows the various endpoint
types to be easily interchanged, if necessary. (If three-pair cable is used with a U.S.
system, extra terminal blocks and the use of cross-connect wiring techniques are
required.)
• Install proper type cable for the application according to the National Electrical Code and
local building codes [BS 6701 in Europe].
• Avoid cable runs parallel to fluorescent light fixtures or AC lines not in conduit. If these
obstacles are unavoidable, run the cables across them at right angles.
• Do not run cables inside electrical conduit already occupied by AC power cable. (To do so
is a violation of the National Electrical Code or BS 6701.)
• Do not run cables near equipment with electric motors or through strong magnetic fields,
such as those generated by large copy machines, arc welding equipment, heavy motors,
etc.
• Do not place station cables where they can be stepped on or where they can be rolled
over by office furniture.
• If using multi-pair (for example, 25-pair) cable runs to multiple station locations, do not
include AC-ringing single line endpoints, or AC-ringing auxiliary equipment.
• Using 24 AWG solid copper cable, do not exceed the loop limit measurements for the
endpoint cable lengths. The resistance values (in ohms) are loop measurements; the
distance values (in feet or meters) are the maximum one-way measurements from the
equipment chassis. The loop limit for digital endpoints is 62Ω and 1200 ft (366 m). See
Table 5-7 on page 5-60 for additional loop limits for devices connected to the Mitel
platform.
Because the Mitel 5000 platform uses digital voice and data transmission between the digital
endpoints and the chassis, the following cabling requirements apply:
• Do not use shielded cable, and do not use cable smaller than 24 AWG.
• Do not parallel cables (for example, do not “double up on the copper”).
• Do not “bridge” or “Y” off the cable to another location.
• Digital endpoints do not need to be routed in separate multi-pair cable runs. For example,
if using 25-pair cable runs to multiple station locations, it is acceptable to include single
line endpoints, auxiliary equipment, and trunks in a cable being used for endpoints.