NEC UNIVERGE SV8100 System Hardware Manual page 366

Issue 5.0
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8. Remove the back half of the Door Box and attach this mounting bracket
to the wall with the two screws provided.
9. Connect the two-conductor station cable from the CN4 connectors within
the PGD(2)-U10 ADP to the Door Box terminals. These wires must be
routed through the opening in the bottom of the Door Box mounting
bracket.
Be sure to maintain the proper polarity.
.
10. Replace the front half of the Door Box and reattach the screw to secure it
in place.
11. To connect a Door Box to an external relay for an unlock device, for
example, connect one-pair 24 AWG station cable from the Relay 5 (for
Door Box 1) or Relay 6 (for Door Box 2) connectors (CN5) in the
PGD(2)-U10 ADP. Connect the opposite end to the unlock device.
Refer to External Page and Door Box/Page Relays on page 6-18 for additional
.
information when using the CD-CP00 relay.
UNIVERGE SV8100
Installing SV8100 Optional Equipment