Hie; Fsp - Nortel DMS-100 Series Maintenance Manual

3-4 RLCM-EDC hardware
Line cards
Each of the ten line drawers of the LCM contains a pair of line subgroups
(LSG) and a single BIC. Each LSG contains 32-line card slots that support a
maximum of 640 subscriber line slots. The RLCM-EDC supports subscriber
line card types in the first application. These subscriber line card types are:
NT6X21AA, AB, AC, and AD for Meridian electronic business set (EBS).

HIE

The HIE shelf contains a maximum of three DS-1 interface cards
(NT6X50AB) to connect the DS-1 links to the host controller. The HIE
shelf also contains the following common cards:
Link control cards
The link control cards (LCC) in the HIE shelf convert data between DS-1
format, to and from the host office. The LCC also convert data between
DS30A format to and from the LCM. The DS30A ports of the LCM map to
the DS-1 interface cards in the HIE. Data routes through the DS-1 links to
the host.
Each LCM unit (LCA shelf) has one LCC in the HIE. In normal operation,
the two LCCs form alternate connections to even and odd LCAs. If an LCC
fails in the HIE, the mate LCA handles all the DS-1 links.
Each LCC functions as a clock. The LCC locks the frequency of the LCC to
the primary DS-1 links. The same clock source drives both LCC clocks.
The clock source is the host LTC+. One of the LCCs is the primary LCC, as
the host LTC+ directs. The LCC frequency locks the C-side primary link of
that LCC. The LCC synchronizes to the timing that the host peripheral of
the LCC downloaded. The other LCC frequency locks to the primary LCC
clock to derive the timing of the LCC. The LCC clock functions serve both
the DCCs and the Remote Maintenance Module (RMM).

FSP

The FSP provides an interface between the power distribution center and the
power converters in the LCM. The FSP also contains alarm circuits that
monitor conditions of low voltage from the power converters.
297-8381-550 Standard 02.02 April 1999
Note: The NT6X21 EBS card is the only applicable line card in the first
application of the RLCM-EDC.
NT6X73AA—Link control card (two)
NT2X70AF—Power converter, 5 V, 12 V (two)