Avaya 03-300430 User Manual

The PN’s TN775D Maintenance circuit pack monitors and supports environmental maintenance 
for PN multicarrier or single-carrier cabinets. The PN’s Maintenance circuit pack provides switch 
software with a mechanism to activate or deactivate Emergency Transfer in the PN. Control by 
the system of Emergency Transfer can be overridden by the Emergency Transfer switch on the 
faceplate of the circuit pack. The PN’s Maintenance circuit pack invokes Emergency Transfer 
when the PN loses contact with the media server or when the PN’s Maintenance circuit pack 
loses contact with every Expansion Interface circuit pack. The PN’s Maintenance circuit pack 
handles loss of AC power in the PN multicarrier cabinet by supplying battery power for 15 
seconds to the PN cabinet and then an additional 10 minutes of power to just the control carrier 
in the PN. When power fails in a single-carrier PN cabinet, no such power holdover is available. 
In the event that an Expansion Interface circuit pack goes insane and is reset six times within 15 
minutes, the PN’s Maintenance circuit pack will hold the Expansion Links reset preventing the 
Expansion Interface circuit pack from running.
The PN’s Maintenance circuit pack has alarm LEDs which indicate the presence of Major, 
Minor, and Warning alarms. A flashing LED indicates the presence of an alarm within the 
cabinet. A continuously lit LED indicates the presence of an alarm elsewhere in the system.
See 

on page 744 for an explanation of emergency 

transfer operation in a G650 Media Gateway port network. 

The system provides customers a way to connect their own alarm indication device to a switch. 
The CUST-ALM MO represents this customer-provided alarming device (CPAD).
The customer administers the level of alarm for which the CPAD will be activated using the 
change system-parameter maintenance screen (CPE Alarm Activation Level field). The 

customer sets this field to: none, warning, minor, or major depending on the level of alarm at 
which the CPAD should be activated. When an alarm occurs of at least the level to which the 
CPAD is administered, the CPAD in the PN will be activated. The CPAD will also be activated 
within a cabinet whenever Emergency Transfer is invoked within that cabinet.
The CPAD is connected to the PN’s Maintenance circuit pack. The CUST-ALM MO is not 
maintained by the system, and will not generate any alarms. If a problem is suspected with the 
CPAD, it may be tested using test customer-alarm, which will activate the device by 

MAINT

MIN

test maintenance sh

PN’s Maintenance circuit pack

MAINT

MAJ

PN’s Maintenance circuit pack