3Com RELEASE 2 installation manual Mounting the Control Unit, Have a dial tone

MOUNTING THE CONTROL

UNIT

If	And	Do This
Each outside line		Go on to the next procedure,
has a dial tone		"Mounting the Control Unit."
A line does not	The jack for that line at	Have the local telephone company
have a dial tone	the network interface is	check the line and the network
	a 1-line (RJ11-type) jack	interface. Meanwhile, go on to the
		next procedure, "Mounting the
		Control Unit," and continue with
		the installation.
	The jack for that line at	Replace the adapter with a new
	the network interface is	one, and test again for a dial tone.
	a 2-line (RJ14-type) jack	If the problem remains, have the
	with a 2-line adapter	local telephone company check the
		line and the network interface.
		Meanwhile, go on to the next
		procedure, "Mounting the Control
		Unit," and continue with the
		installation.
	The jack for that line is	Check the wiring run from the jack
	in the jack field	in the jack field to the connector at
		the network interface and fix any
		loose connections. If the problem
		remains, have the local telephone
		company check the line and the
		network interface. Meanwhile, go
		on to the next procedure,
		"Mounting the Control Unit," and
		continue with the installation.

Control Unit Location The control unit is designed to be mounted on a wall in an environment that meets certain requirements for proper operation. (See Figure 4.) Check that the following environmental and measurement requirements are met before proceeding:

Warning Do not install the control unit in areas that may be exposed to water leakage or accidental spills of liquids. In the event that liquids come in contact with the control unit, turn off and unplug the unit and contact your AT&T technician immediately.

●The control unit is within 5 feet of a grounded ac power source.

NOTE: If the outlet is not properly grounded, install an 18-gauge (or thicker) wire from the ground lug on the control unit to the building ground. For more information on grounding and grounding tests, see Appendix C: Grounding Requirements."

In areas of the country with frequent lightning or severe transient voltage, you may also want to provide external protection to the control unit with an ac surge suppressor at the wall power source. You can combine both ac and CO line surge protection with the 147A Protector, installed as described in CIB 3109.

●The control unit is within cord length of the network interface provided by the local telephone company. Cord lengths are 7, 14, and 25 feet. Also, up to 400 feet of DIW cable can be used to connect the network interface to the control unit.

6Step 1: Installing the Control Unit