3Section 61150087L1-5, Issue 161150.087L1-5A
Table A. Wiring
HDSL HTU-R
To Customer
Network Loop 1
GND
Network Loop 2
From Customer
ISDN BRIDLE-R
Customer
Network Loop 1
GND
Network Loop 2
NC
ISDN TR-R
NC
NC
GND
Network
Customer NT1
Pins
5, 15
7,13
11
41, 47
49,55
HDSL HRE
Customer Loop 1
Network Loop 1
GND
Network Loop 2
Customer Loop 2
HDSL FNID
To Customer
Network
GND
NC
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.
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.
Rptr. Case Cover
O-ring
Rptr. Base
Mounting Case Bolts
CUSTOMER ACCESS
NETWORK INTERFACE DEVICE
WARNING!
COVER TO BE
REMOVED BY TELEPHONE
COMPANY PERSONNEL
ONLY
Bracket Mounting Bolts
