Avaya DEFINITY Server R Manual page 197

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NOTE:
The 9823A transceiver is not a direct replacement for the 4-series
transceiver (since a pair of 9823A transceivers cannot replace a pair of
4-series transceivers supporting a connection of between 5000 feet
(1524 m) and 7000 feet (2134 m)).
Power and Ground
The new multicarrier PPN cabinet or any EPN cabinet added for the upgrade can
be either global AC- or DC-powered. If an added cabinet is powered differently
from the existing cabinets, the existing cabinets do not have to be converted since
mixed power configurations are allowed. However, the system's power and
grounding must be modified so that the AC-powered cabinets are grounded to the
same single-point ground point as the DC-powered cabinets.
If a new global AC-powered cabinet is to be added, provide a separate AC
receptacle to support the new cabinet. This AC receptacle must not be shared
with any other equipment and must not be controlled by a wall switch. For the
convenience and safety of equipment-room personnel, the receptacle should not
be located under the MDF.
NOTE:
The new global AC-powered PPN has different power requirements than the
G2 system. Refer to the System Description for information.
DC Isolator
Each device connected to a DC-powered cabinet, from the asynchronous EIA
RS-232 interface, requires a 116A isolator. Insert the isolator at the RS-232
interface between the device and the interface connector to isolate ground
between the system and external adjuncts.
Power-Failure Stations
During routine system operation, the ground for the power-failure stations is
derived from the system's auxiliary cable. This ground is disconnected during the
upgrade, thus disabling the power-failure stations. Therefore, a ground strap must
be run to the power-failure transfer panel. Connect this strap shortly after
removing power and disconnect it just before restoring power to the system.
To minimize downtime, power-failure transfer equipment should be tested and, if
need be, repaired before the hardware upgrade begins.
555-233-115 Issue 5 October 2002
5-5