Line Drawers - Nortel DMS-100 Series Maintenance Manual

2-6 Functional overview
host LTC or LGC to a maximum of 640 lines. The NT6X51AB/AC requires
XLCM software loads.
Before the release of BCS28, LCMs were equipped with the NT6X51AA
LCM processor card with 64 kB of RAM storage capacity. The NT6X51AA
requires LCM software loads. The LCA shelf with these cards is NT6X04AA.
Digroup control card (DCC)
Slot 05 of the LCA shelf contains the DCC (NT6X52). The DCC allows the
LCA and HIE shelves to communicate. The DCC provides an interface
between the corresponding LCM processor in the LCA and one link control
card (LCC) in the HIE. The DCC provides this interface through eight DS30A
links. This interface appears in the figure below.
The DCC provides time switching that associates a line card to a given channel
on a DS30A link. The DCC provides digital loop-around paths for fault
isolation.
Figure 3 OPM DS30A to DS-1 interface

Line drawers

Each line drawer (NT6X05) in the LCA shelf has one bus interface card (BIC).
Each line drawer has a maximum of 64 line cards of different types. The side
view of a normal LCA line drawer appears in the figure below. Operating
company personnel can remove the line drawer from the frame to access line
297-8361-550 Standard 04.02 December 2004
HIE shelf
LCC-1
(NT6X73)
To DS-1
interface cards
(NT6X50)
LCC-0
(NT6X73)
LCA shelf 1
DCC-1
(NT6X52)
8 DS30A
DCC-0
(NT6X52)
8 DS30A
LCA shelf 0
LCMP-1
(NT6X51)
To line drawers
(NT6X05)
LCMP-0
(NT6X51)