Hie Description - Nortel DMS-100 Series Maintenance Manual

1-18 Maintenance overview

HIE description

The HIE occupies a single shelf position in the OPAC frame. The HIE
allows LCA shelves of the OPAC to connect to the RMM and host office.
The HIE shelf contains the following components:
The following sections describe these components.
HIE shelf configuration
As the following figure shows, two ringing generators occupy slots 01–08 in
the HIE. Each generator is four slots wide. When provisioned, the optional
ESA control complex occupies slots 14 through 16.
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 to 24
and 25, in that order. Slot 25, the slot the most near the right on the shelf, is
as wide as three normal HIE slots.
Figure "HIE shelf layout" and table "Host interface equipment shelf layout"
describe the cards in the host interface equipment shelf.
Ringing generators
The North American ringing generators (RG) (NT6X60) contain 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. Ringing generators support coded, superimposed
and frequency selective ringing.
The ringing generators contain ANI and coin generator circuits. These
circuits check for two-party or four-party ANI, and for coin presence in
prepay coin telephones.
The ringing generators produce voltages required for ANI and coin control
(48 V dc and 130 V dc). The ringing generators monitor ANI and coin
voltages and ring bus outputs for failure.
297-8211-550 Standard 05.01 August 1999
two ringing generators
two LCCs
two to three DS-1 interface cards
two power converters
one ESA control complex (optional)