Nortel DMS-100 Series Maintenance Manual page 109

PRLCM overview 2-7
Note: Links 0 and 1 are message-supporting links that have special
maintenance protection. Each PCM30 message supporting link has a
channel 12 looparound known as extended PCM30 maintenance. A channel
12 looparound connects the outgoing side of channel 12 to the incoming
side. The looparound makes sure the user does not busy the link where the
looparound applies. The looparound makes sure the user does not busy the
link when the unit the link supports is in service. When the user busies the
unit this link supports, the extended PCM30 maintenance looparound is
disabled. The user can busy the link, and the looparound is reenabled as
NT6X50 card diagnostics for maintenance of the PCM30 link.
Power converter card
Two power converters occupy the far right of the HIE shelf in slots 22 to 24
and 25 in the sequence provided. Slot 25 is the slot on the right side in the
shelf.
ESA control complex
The HIE shelf contains two additional circuit cards if the ESA feature
package is present. Two configurations are possible. The NT6X45AF
configuration occupies slots 14 through 16. An ESA memory card, a
processor cards, and a clock and tone card fill those slots. The second
configuration uses the NTMX45AA ESA processor card. This configuration
does not use slot 14, but slot 15 holds the processor card and slot 16 holds
the clock and tone card. Chapter "ESA maintenance overview" discusses
the ESA configuration and operation.
The following diagram describes the PRLCM link, port, and channel
structure.
DMS-100 Family RLCM Maintenance Manual XPM12 and up