Mitel MIVOICE OFFICE 250, Руководство по установке и администрированию

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Installation
233
STATION CABLING CONNECTIONS
At this point in the installation, all cabling to the MDF, patch panel, optional rack, and stations should
be completed. This includes all cables that terminate at the chassis modules.
To complete cabling:
1. Plug all applicable cables into their respective modules and chassis ports.
2. Connect the modules to MDF blocks or a patch panel using appropriate cabling. For digital
station cabling, see the information beginning in the section below.
Connecting Station Cables to the MDF
This section describes connecting station cables to the MDF in a USA or European system.
Connecting DEM-16 Station Cables to a U.S. System
Digital telephones are connected to DEM-16 ports. Single line devices are connected to Single-Line
Adapters (SLA) which are in turn connected to available DEM-16 circuits.
Besides single line phones, 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 1-301 .
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
14 on
page 234
through Figure 18 on
page 240
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 19 on
page 157
).
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 244 .