Specifications

Line and Station Boards and Special Components
Printed in the USA Page 3 GCA39-825 Rev 2, Issue 4/02
FX System Line Boards
Loop Start Line Board
Part Number: FXLST-16 (16-port Analog)
• These line boards support basic loop start lines from the local Telephone Company.
• Loop start lines are the most basic line application and, typically, the least expensive type of
line for a telephone system.
• Every loop start line board provides a tip and ring pair connected to line 1 as an emergency
power failure circuit.
• This power fail circuit is active during a commercial AC power failure if an external battery
assembly is not installed to provide battery back-up power to the system. Pair 25 (pin
numbers 50 and 25, clip terminals 49 and 50) on the line board connector jack provides the
power failure connection.
• Each line board makes one auxiliary equipment connection available for use. This
connection is at Pair 24 (pin numbers 49 and 24, clip terminals 47 and 48) and is associated
with line 2 of that line board.