PHASTLink Cable Information
6
Appendix: PHASTLink Cable Information
Building a Double 120-ohm Terminator
For optimum performance, you must install a double 120-ohm terminator in the unused RJ-45 jack
of the last device (or the only device) in a chain of PHASTLink devices.
To build a double 120-ohm terminator:
1.
Install a 120-ohm resistor (1/4-watt or larger) between pins 1 and 2 of an RJ-45 connector.
2.
Install a 120-ohm resistor (1/4-watt or larger) between pins 7 and 8 of the same RJ-45
connector.
When connecting Landmark keypads that will be used as intercoms, the Microphone Hub taps off
the intercom audio signal carried on the PHASTLink cable from that keypad.
Landmark LCD keypads must connect directly to a Landmark Hub (or Microphone Hub). Due to
power requirements and/or the need for a separate microphone line for each keypad, they cannot be
daisy-chained to other LCD keypads. For maximum performance and reliability, a Landmark
keypad should be the only device on a home run to a port. PHASTLink devices cannot be wired in
a star configuration (see FIG. 2).
FIG. 1
500 mA or 10 devices (whichever comes first) max per port.
FIG. 2
Home-run each Landmark LCD keypad.
PLB-CF10 Cardframe
To other PHASTLink devices
(up to 500 mA total, or 10 devices -
whichever comes first)
Up to 15 PHASTLink
connections to a PLB-CF10 Cardframe -
up to 500 mA per port
hubs for more connections).
(add PHAST
PHAST Cardframe or Hub
PHAST Cardframe or Hub
