Checking The Port Connections To The Pbx; Checking The Receiver Allocation - Mitel SX-200 EL Technician's Handbook

4. Measure the Ring current:
Set the meter to Milliamperes = DC and Range = 200
n
Milliamperes.
Connect the meter between the Ring trunk lead and the
n
building's open-ended ground wire. Be sure that you disconnect
the building ground wire from the PBX ground-stud.
5. Allow sufficient time for the current to stabilize and record the Ring
current.
DC Ring current = ________________________
n
6. Calculate the CO/PBX ground potential by dividing the Ring current
value by the Loop current value.
Checking the Port Connections
to the PBX
Refer to information showing the pin numbers and signals for the T1
and PRI Trunk Port, Table 41 on page 201, the SFT Port,Table 36 on
page 199, the Copper Interface Ports,Table 38 on page 200, the
Maintenance Terminal and Printer Ports,Table 39 on page 200, or the
Maintenance Module Port Table 40 on page 201, in this handbook.

Checking the Receiver Allocation

Receivers allow devices which use DTMF signaling to communicate
dialing information to the PBX.
DTMF Receivers (DTMF Module)
DTMF receiver modules may be installed on a Universal Card. Each
Universal Card can contain up to four receiver modules; each receiver
module contains four receivers, for a total of 16 receivers.
Troubleshooting and Repair
65