Nortel DMS-100 Series Maintenance Manual page 96

2-20 Functional overview
Primary ports that map one to one with DS-1 links are equipped ports. The
number of equipped ports in an LCA depends on the number of DS-1 interface
cards provisioned in the HIE. When three DS-1 cards are provisioned, all three
primary ports (0, 1, 2) for each LCA are equipped. When a port is not
equipped, the ports are in use or not in use. The ports can operate for features
contained in additional OPM feature packages, when provisioned.
Power converter card
The two HIE power converters supply the necessary shelf voltages (5 V, 12 V)
for the HIE shelf. Slots 22 and 25 contain the HIE power converters.
ESA control complex
If the user selects the ESA feature package, two configurations are possible.
The NT6X45AF based ESA package consists of three pieces of equipment:
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The NTMX45AA based ESA package consists of two pieces of equipment.
This package includes an ESA processor that enables duplicate Nxx in ESA
mode and provides firmware downloads. This card has 8 Mbytes of on-card
memory. With this package, the ESA memory card is not needed and slot 14
has a filler plate.
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The "OPM link, port and channel structure" appear in the following figure.
297-8361-550 Standard 04.02 December 2004
Note: Links 0 and 1 are message-supporting links that have special
maintenance protection applied to them. On each DS-1 message-supporting
link, the following looparound occurs. A channel 12 looparound connects
the outgoing side of channel 12 to the incoming side of channel 12. The
name of the looparound is extended DS-1 maintenance. The looparound
prevents the manually busying the link to which the looparound is applied.
This event occurs when the unit that the link supports remains in service.
When operating company personnel set the unit this link supports to ManB,
the looparound is disabled. At this time, the link can be busied and the
looparound is enabled as NT6X50 card diagnostics for maintenance of the
DS1 link.
one ESA memory card (NT6X47AC), slot 14
one ESA processor card (NT6X45AF), slot 15
one ESA clock and tone card (NT6X75AA), slot 16
one ESA processor card (NTMX45AA), slot 15
one ESA clock and tone card (NT6X75AA), slot 16