Chapter 5: Installation
Connecting Station Cables to the MDF
Page 5-78
Inter-Tel
®
5000 Installation Manual – Issue 2.4, May 2008
Connecting Station Cables to the MDF
This section describes connecting station cables to the MDF in a USA or European system.
Connecting Station Cables to a U.S. System
Digital endpoints are connected to DEM-16 ports. Single line endpoints are connected to Single-
Line Adapters (SLA) which are in turn connected to available DEM-16 circuits.
Besides single line endpoints, playback devices, and off-premises extensions, SLAs can also be
used to install DID trunks. Any combination using the two circuits on the SLA is possible. DID
trunk installation instructions appear in “Installing DID Trunks on an SLA (USA Only)” on
page 5-133
.
After the station cables are run, connect them and the 25-pair cables to the DEM-16 blocks on
the MDF as follows:
1.
Ensure that both ends of each station cable are labeled with the circuit number of the
associated station instrument.
2.
Terminate each station cable on the
right
side of the corresponding station block. See
Figure 5-44 on
page 5-79
through Figure 5-48 on
page 5-82
for station cable
terminations.
For simplicity, the figures show station instruments being installed using one-pair cable
and four-conductor modular jacks. If three-pair cable and six-conductor modular jacks
are used instead, extra terminal blocks and the use of cross-connect wiring techniques
are required.
3.
Using enough 25-pair cable to run from each block to each DEM-16 in the equipment
chassis, make the termination cables. Label each connector and cable end with the
appropriate bay number (for example, Bay2). These connectors will be attached to the
DEM-16s after they are installed.
4.
If necessary:
Using standard electrical tape, tape two ferrite split beads around each 25-
pair cable just below the Amphenol-type connector (as shown in Figure 5-6 on
page 5-
26
).
5.
Ferrite beads may be necessary to help reduce electromagnetic interference (EMI) and
radio frequency interference (RFI). The part number for a single split bead is 808.1195.
6.
Terminate the other end of each 25-pair cable on the
left
side of the corresponding
station block.
7. Do
not
attach bridging clips until the loop resistance tests have been performed, as
described on
page 5-83
.
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