Hie Description - Nortel DMS-100 Series Maintenance Manual

HIE description

The HIE occupies a single shelf at position 05, of bay 0 row A, of the OPM
cabinet. The HIE allows the LCA shelves of the OPM to connect to the RMM
and to the host office. The HIE shelf contains the following parts:
• two ringing generators
• two LCCs
• two to three DS-1 interface cards
• two power converters
• one emergency stand-alone (ESA) control complex
The following sections describe these parts.
HIE shelf configuration
The two ringing generators occupy slots 01-08 in the HIE. Each generator is
four slots wide. The ESA control complex, when provisioned, occupies slots
14-16. The shelf configuration appears in figure "HIE shelf layout."
The LCCs occupy slots 17 and 18 of the HIE shelf.
Two power converters occupy the far right of the HIE shelf in slots 22 and 25,
in the order given. Slot 25 is the slot on the shelf furthest to the right.
Ringing generators
The ringing generators (NT6X60) contain the frequency circuits that generate
ringing signals to subscriber line cards on the LCA shelves. Ringing patterns
meet requirements set by Bell Canada and Telcordia Technologies. The
following types of ringing are supported:
• Coded
• superimposed
• frequency selective ringing
The ringing generators contain ANI and coin generator circuits. The ANI
circuits check for two- or four-party ANI. The coin generator circuits check
for coin presence in prepay coin telephones.
The ringing generators produce voltages required for ANI and coin control (48
Vdc and 130 Vdc). The ringing generators monitor ANI and coin voltages and
ring bus outputs for failure.
DMS-100 Family OPM Maintenance Manual ISN07 (TDM)/SN07 (DMS) and up
Functional overview 2-15