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20 | Section 2
To connect two Desktop Directors to one port, a power supply and RJ-45 modular splitter is
required.
One of the Directors must have its termination removed. is unterminated Director must be
within 33 feet (10 meters) of the power supply.
Desktop Director Termination Removal
Desktop Directors are shipped with the internal termination resistors enabled. When two
Directors are used in a single port, the termination on the Director closer to the power supply
will need to be disabled. To do so, follow these steps:
Disconnect the Desktop Director from the Nx12.1.
Remove the handset and turn over the Director so you can see the bottom of the unit.2.
Remove the round black cover. is can be pried off with a knife blade. Or a miniature 3.
screwdriver may be pushed firmly under the lip and then lifted out to pop the cap loose.
You will see a black rectangular transformer labeled T1. To the right of T1 locate and 4.
remove the jumpers labeled JP1 & JP2. ese are small jumper blocks, which can be lifted
off with needle-nose pliers.
You’ll want to save the jumper blocks. You can store each of them on one of the jumper 5.
pins.
Replace the access cover removed in step 3 by pushing it firmly in place.6.
Reconnect the Desktop Director cable.7.
Check for proper operation8.
Desktop Director Cable
Each Desktop Director is supplied with a 25-foot cable. If you need another length, you can
make your own cable. e Director connection is electrically identical to the ISDN S-interface,
so the wiring scheme is the same. A straight-through (not crossover) cable is used between
the Nx12 and the Director. TIA 568A or 568B standard Category 5/5e cables may be used.
Category 3 cable is acceptable for this wiring. But since category 5e is so common and low-cost,
we recommend that you use it instead.