Mitel Inter-Tel 5000 Installation And Maintenance Manual page 178

Chapter 5: Installation
Running Cables to Endpoints
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Because the Inter-Tel 5000 platform uses digital voice and data transmission between the digital
endpoints and the chassis, the following cabling requirements apply:
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Possible Delay in Local Emergency Response to Remote Sites. IP and SIP endpoint users
should be alerted to the following hazardous situations:
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For details about the Power Failure Bypass feature, see "Back of the Chassis" on
For installation instructions, see "Built-In Ports for WAN Fail Survivability" on
Page 5-56
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 5-54 for additional loop limits for devices connected to the Inter-Tel
5000 platform.
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").
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Do not "bridge" or " " 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.
WARNING
If an Emergency Call endpoint number is dialed from an IP or SIP endpoint located at a
remote site that is not equipped with a correctly configured gateway, the call will be
placed from the location where the system chassis is installed rather than from the
location where the emergency call is made.
In this situation, emergency responders may be dispatched to the wrong location. To
minimize the risk of remote site users misdirecting emergency responders, Inter-Tel
recommends regular testing of SIP/MGCP gateway trunk(s) for dial tone.
If uninterruptible power supply (UPS) protection has not been installed as part of the
Inter-Tel 5000 system, IP and SIP endpoints will not operate when electrical power fails
either at remote sites or at the main system location.
To place calls during a power failure in this situation, IP and SIP endpoint users can only
use a single line endpoint connected to one of the power failure bypass circuits built into
the system chassis. If a endpoint connected to a power failure bypass circuit is not
available, users should make emergency calls from a local endpoint that is not
connected to the system.
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Inter-Tel 5000 Installation Manual – Issue 2.4, May 2008
page 3-8.
page 5-27.