Specifications

3.8
.I
When you do any work with telephone lines, always adhere to the
Connecting The
following safety guidelines:
Lines 1
- Never install telephone wiring during a lightning storm.
- Never install telephone jacks in a wet location unless the jack
is specifically designed for wet locations.
- Never touch uninsulated telephone wires or terminals unless
the telephone line has been disconnected at the network
interface.
- Use caution when installing or modifying telephone lines.
The telephone company’s “demarcation block,” commonly referred to
as the RJ21X, is usually a 66-type connector block or a series of
individual 4-position modular jacks. You must place your own
specialized 66-block next to the demarcation block and connect them
with # 24 gauge wire. Before you run line cables to the cabinet, use a
telephone test-set to check each CO line for a dial tone.
Always take thorough notes about line locations and types; you will
need all of this information later when you connect your peripheral
equipment and program your lines and line groups. Good records are
essential too if we need to come back later and make line changes or
move lines.
Surge Protection
The telephone company usually offers a basic protection against the
possibility of transient voltage spikes traveling through the lines, but
that protection usually only guards the CO circuits and not the DXP.
In order to fully protect your lines, install and properly ground
primary surge protection on all lines. Comdial recommends that you
use gas-discharge tubes, but any similar line-protection device will
suffice. Once all of the lines are connected from the demarcation
blocks to the 66 blocks, it’s a good idea to mount another series of
66-blocks; these blocks will connect directly to the DXP’s
multipurpose line boards. Having the connections to the DXP and to
the demarcation blocks separated by another 66-block allows you to
move the lines easily without having to alter the wiring scheme from
the CO or to the DXP.
IMI66-085 provides a diagram illustrating the line connections; it
shows the connections in relation to the 25-pair amphenol connector.
When you are wiring your lines, keep in mind that ground start lines
are polarity sensitive.
3 - 10 Installing The DXP