Rectifiers; T1 Repeater Shelf; Environmental Controls - Nortel DMS-100 Series Maintenance Manual

Rectifiers

The rectifier shelf contains two or three NT5C06CA MRP25E ac-to-dc
rectifiers. A minimum of two rectifiers are required. Three rectifiers allow
for n+1 redundancy when optional or customer installed equipment requires
dc power dissipation over 25 ampere (A) total.
The 25 A rectifiers accept ac power from the attached power pedestal. The
25 A rectifiers deliver dc power to operate the installed equipment, fans, and
BCU. Output voltage is adjustable from –44 V dc to –56 V dc. The system
adjusts output voltage to provide an output of –52.5 V dc
The rectifiers are above the MSP in bay 1.

T1 repeater shelf

The T1 repeaters, used for metal connections back to the host are in an
A0617243 shelf from Wescom.
The shelf comes factory wired for six slots. The slots are dedicated to the
OPAC for a host communication link. There are 16 additional slots are
available for links operating company-provided equipment located in the
cabinet requires. This unit fills the shelf space in the top right-hand corner
of bay 1.
The shelf features rear-access wire-wrap connectors. The connectors allow
the T1 signal to bridge to a fiber unit that eliminates the requirement for T1
repeater cards.

Environmental controls

Temperature sensing
Four environmental thermostats and alarms sense temperature:
high temperature alarm fixes at 60 C, at the top of bay 0
heater thermostat fixes, ON at 5 C, OFF at 15 C, on the ac outlet box
cover
fan thermostat is adjustable, exhaust bank ON at 18 C, (65 F) above
the heater thermostat
low temperature alarm fixes at 0 C, below the fan thermostat.
For more information on environmental monitoring equipment, refer to the
Alarm Clearing Procedures.
DMS-100 Family OPAC Maintenance Manual XPM12 and up
OPAC hardware 5-11
0.5 V dc.