Host Interface Equipment; Frame Supervisory Panel; Additional Rlcm Components; Hie Components - Nortel DMS-100 Series Maintenance Manual

5-4 RLCM hardware

Host interface equipment

The HIE shelf (NT6X1101) contains the DS-1 interface cards (NTX650AA)
that connect the DS-1 links to the host controller. The HIE shelf also
contains the following common circuit 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 LCCs also convert data between
DS30A format to and from the LCM. The DS30A ports of the LCM are
mapped to the DS-1 interface cards in the HIE. The system sends data
through the DS-1 links to the host.
The HIE contains one LCC for each LCM unit (LCA shelf). In normal
operation, the two LCCs are connected in a different way to even and odd
LCAs. If an LCC fails in the HIE, the mate LCA can handle all the DS-1
links.
Each LCC locks the frequency to the primary DS-1 link and functions as a
clock. The host LTC/LGC powers both LCC clocks. One of the LCCs is the
primary LCC, as directed by the host LTC/LGC. The primary LCC
frequency locks to the C-side primary link of the central control (CC). The
primary LCC locks to synchronize to the timing downloaded by the host
peripheral of the LCC. The other LCC frequency locks to the primary LCC
for timing. The LCC clock functions can serve both the DCCs and the
RMM.

Frame supervisory panel

The RLCM can have an FSP (NT6X25AA) or a remote FSP (NT6X25BA).
The FSP provides interface between the power distribution center in the FSP
and the power converters in the LCM. The FSP also contains alarm circuits
to monitor under-voltage conditions from the power converters.

Additional RLCM components

HIE components

For the RLCM to function with emergency stand-alone (ESA) capability, the
HIE shelf must contain the following cards:
297–8351–550 Standard 04.01 August 1999
NT6X60AA—RLCM ringing generator (two)
NT6X73AA—Link control card (two)
NT2X70AE—Power converter,
NT6X45AF—XPM processor card
NT6X47AC—4Mb master processor memory plus card
5 V, 12 V (two)