ADTRAN 19 warranty Isdn BRIDLE-R Isdn TR-R Hdsl Fnid Hdsl HRE Hdsl HTU-R

Table A. Wiring

Pins	ISDN BRIDLE-R	ISDN TR-R	HDSL FNID	HDSL HRE	HDSL HTU-R
5, 15	Customer	NC	To Customer	Customer Loop 1	To Customer
7,13	Network Loop 1	NC	Network	Network Loop 1	Network Loop 1
11	GND	GND	GND	GND	GND
41, 47	Network Loop 2	Network	NC	Network Loop 2	Network Loop 2
49,55	NC	Customer NT1	From Customer	Customer Loop 2	From Customer

3. Remove the cover from the housing base.

Handle the circuit packs only by the front panel handle. Take care to avoid the sharp exposed pins on the front and back sides of the circuit packs during installation and

maintenance.

Insert the circuit pack (aligning the goldfingers on the circuit pack with the connector inside the environmental housing) in the wired slot.

Place the Cover on the Base

1.Verify that the cover assembly O-ring is properly placed around the cover and is free of debris before replacing the cover.

Rptr. Case Cover

		O-ring
		Rptr. Base
CUSTOMER ACCESS	COVER TO BE	Mounting Case Bolts
	WARNING!
	REMOVED BY TELEPHONE
	COMPANY PERSONNEL
NETWORK INTERFACE DEVICE	ONLY

Bracket Mounting Bolts

Figure 5. T400 Environmental Housing

Assembly

2.Place the cover on the base.

3.Tighten the two bolts using a 7/16" nut driver to 20 in-lbs.

To Replace Surge Arrestors

1.Unseat the appropriate powering modules (located in the central office) before replacing surge arrestors inside the T400 single environmental housing. This removes power from the wires and pins.

2.After cleaning debris from the cover and base, remove the environmental housing cover.

3.Remove the circuit pack.

4.Using the insertion/extraction tool, grasp and remove a surge arrestor (see Figure 6).

Figure 6. Surge Arrestors and the Insertion/

Extraction Tool

5.Place a replacement surge arrestor in the same position.

6.Replace the remaining surge arrestors in the same manner.

7.Reseat the powering modules at the central office.

61150.087L1-5A Section 61150087L1-5, Issue 1 3