3.0 Connecting The DID Lines
The FCC specified jack configuration for DID line connection to the switched network is a universal service order
code (USOC) RJ21X type and the facility interface code for DID is
02RV2-T
. This specified connection is
typically a type 66M-nn connector block.
CAUTION
When connecting the lines for DID applications, be sure that you do not reverse the tip and ring leads.
A 50-pin connector on the DID line board provides its line terminations. You can cable connect the DID board to
the CO line termination with a prepared cable that matches the termination requirements. Snap the supplied ferrite
collar around the cable to provide protection against radio frequency interference.
Before you connect the CO-supplied DID lines to the board, program the system for DID operation, and test the
DID line ports per the steps shown below.
1. Replace the front panel on the common equipment cabinet.
2. Plug the AC line cord into the AC outlet, reconnect any battery back up equipment and turn on the switch on
the power supply.
3. Using the data base programming procedure, program the system for DID line operation.
4. Connect a buttset or an industry-standard telephone (IST) to a line port on the DID line board.
5. Take the buttset or ISToff-hook, and listen for relay click on both wink start and delay start lines.
6. Dial a CO digit string to determine if you can make a call. Have someone answer your call to determine if
you have a complete talk path. If you can complete a call, this verifies that you have programmed the system
correctly.
7. Repeat step 6 as desired for other CO digit strings and repeat steps 4 through 7 at all line ports on the DID line
board.
8. Connect the CO-supplied DID lines to the DID board.
9. Note the DID board’s status light, and compare status with the following details:
Rapid Flash = Malfunctioning on-board processor,
Off with repeated 5 second blink on = Normal operation with all idle lines,
On with repeated 5 second blink off = Normal operation with at least one busy line, (lf a line is active but
the LED is showing off with repeated 5 second blink on, check the wiring for poor connections),
Three Rapid Flashes On Followed By 2.5 seconds Off = One or more lines out of service
IMI89–191
Installing The DID Line Board
8 – Installing The DID Line Board