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10-8
Chapter 10 - Triad 1/2 System Configuration
Triad 2
Common Control Equipment
Basic Key Service Unit (BKSU)
The BKSU is wall mounted. It is of metal construction with a backplane motherboard that has
nine card slots. The first slot (right to left) is for the Master Processor Board (MPB) which is a
common control card. The second slot can be used for the Miscellaneous Service Unit Board
(MISU) or a station/CO card. The remaining seven slots are for peripheral cards. This system is
installed using industry standard blocks, jacks and skinny wire cabling. This combined with
the ability to program the system using a key terminal (digital display telephone) reduces
installation cost and maintenance requirements.
A no. 12 AGW copper wire should be used to connect a ground between the ground source
and the KSU (25 feet maximum). A ground lug is located on the lower right corner of the
BKSU.
Expansion Key Service Unit (EKSU)
The EKSU is wall mounted. It is of metal construction with a backplane motherboard that has
four card slots. The four slots are for peripheral cards.
Power Supply (PSU)
The system KSU is powered by a single power supply that is mounted inside the cabinet. The
power supply provides the system with 24V and 5V power. The power supply is plugged into
a 120V AC circuit.
Triad 2 Common Control Equipment
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