Chapter 5: Installation
Connecting CO Trunk Cables to the MDF
Page 5-22 Inter-Tel
®
5000 Installation Manual – Issue 2.4, May 2008
Connecting CO Trunk Cables to the MDF
This section provides information on connecting CO trunk cables for the LSM-2 and LSM-4
modules and the built-in dual loop start and dual single line ports. The built-in dual loop start
and dual single line ports provide CO trunk capabilities to the single line endpoints in addition to
providing the power-fail bypass functionality.
Connecting Trunks to LSM-2 Module Ports
For this procedure, see Figure 5-2 and Figure 5-3 on page 5-23 as a guide.
To connect LSM-2 Module CO trunks:
1. Cable the dual loop start port (CO trunks) using the pinouts shown in Figure 5-2 on page
5-23.
• Use a patch panel at the rack and adapters between the patch panel and the Inter-
Tel 5000 Base Server. Use the fewest modular jacks and adapters possible, and do
not attach any adapters to the back of the chassis; clearance issues prevent them
from attaching securely. If using a 6-pin, 6-conductor patch panel, make the
appropriate adjustments when using the adapters. You can also build your own 6P/
6C to 8P/8C patch cables, if necessary.
• If using 4- or 6-conductor modular line cord, limit the length to 6 ft maximum. In
general, modular line cords are not twisted pair and could introduce crosstalk
between line 1 and line 2 at longer lengths.
2. Create the split to create two loop start port connections:
• In Figure 5-2 on page 5-23, the split to achieve two loop start ports occurs at the
patch panel. This is the recommended option.
• In Figure 5-3 on page 5-23, the split to achieve two loop start ports occurs at the
MDF using modular jacks.
NOTICE
Inter-Tel, Inc. will continue to support existing LSM-2s in the field, but new modules will not
be sold. For connecting loop start trunks to the Inter-Tel 5000 platform, use the LSM-4
module, part no. 580.2304, or the T1/E1 module, part no. 580.2700.
NOTICE
Equipment Damage Hazard. Use adapters when connecting any 6-pin plug to
an 8-pin jack. Although a 6-pin plug will fit into an 8-pin jack, the plastic on the 6-
pin plug housing will damage pins 1 and 8 on the 8-pin jack. Not using adapters
will increase the likelihood of failure (to pins 1 and 8 in the 8-pin jack) should that
jack need to be used with an 8-pin plug in the future. Various adapter types are
available based on how you choose to connect to the patch panel.
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