Nokia 6800 Series, 7000 Series operation manual Controls, Indicators, and Jumpers

Controls, Indicators, and Jumpers Chapter 3: EDH-6800-2 EDH Detection/Insertion Serial Distribution Amplifier Module

Both jumpers (J5 and J8) must be configured identically. And all EDH-6800-2 (and similar) modules in the same frame must be configured identically (FR-ID On or Off).

Jumper	Description
FR_ID On/Off	Selects between external 9000SSN Frame ID or fault
	opto-isolated output.
	When set to On, EDH-6800-2 will attempt to read the
	Frame ID from the 9000SSN silicon serial number device at
	the FR-680X series frame RJ11 connector. When set to Off,
	the EDH-6800-2 will use the RJ11 connector for the fault
	reporting output (see page 32.) When both jumpers are
	removed, the EDH-6800-2 is isolated from the RJ11
	connector. If EDH-6800-2 does not detect the 9000SSN
	device (if none is present at the RJ11 or if FR-ID is Off),
	EDH-6800-2 will attempt to use the dual hex Frame ID
	switches (SW4 and SW5) to determine Frame ID.

6800/7000 Series - Distribution and Routing Products Installation and Operation Manual 31