Installing a 7750 SR-a Chassis Horizontally in a Rack
To attach the ETSI adapter brackets to the chassis:
Step 1.
Position an adapter bracket so that the narrower portion of the bracket with the round threaded holes is behind the mounting flange of the chassis. The portion of the adapter with the oval mounting holes must face outwards.
Step 2.
Attach the adapter brackets to the chassis using the eight supplied 12-24 screws.
Step 3.
Use a #3 Phillips torque driver to tighten the screws. Do not over-tighten. Torque to 24 to 28 lbf-in (2.71 to 3.15 N.m).
Step 4.
Repeat Step 1 to Step 3 to attach the bracket to the other side of the chassis. You
are now ready to install the chassis in the rack.
Installing the Chassis in the ETSI 600-mm x 300mm Rack
Figure 21
shows the 7750 SR-a4 chassis, Figure 22 shows the 7750 SR-a8 chassis, and
Table 37 describes the keys to both figures.
Figure 21: Installing the 7750 SR-a4 Chassis in the ETSI Rack
82
7750 SR-a4
S ervice Router
4 3 2
1
24659
7750 SR-a4 and SR-a8 Installation Guide
Installing the 7750 SR-a Chassis
Figure 22: Installing the 7750 SR-a8 Chassis in the ETSI Rack
1
7750 SR-a8
S ervice Router
4 3 2
24657
Key
1
2
3
4
Table 37: Rack Mounting Parts: ETSI Rack with Adapters
Description
ETSI equipment rack rail
Screws used temporarily to support the bottom edge of the ETSI brackets during chassis installation. Screws are partially installed in the rack rail in the lowest allocated U-space on both sides of the rack unit.
ETSI brackets (installed on chassis, as described in
Attaching the Adapter
Brackets to the Chassis on page 80
). The oval (unthreaded) mounting holes are used to attach the adapter bracket to the rack.
Eight screws to attach the ETSI adapter bracket to the equipment rack (screws not included)
Required tools:
7750 SR-a4 and SR-a8 Installation Guide 83
Installing a 7750 SR-a Chassis Horizontally in a Rack
• a torque driver for the ETSI rack screws. Refer to the rack manufacturer’s documentation for instructions.
• a #2 or #3 Phillips torque driver, depending on the screw size that you use
To install the chassis horizontally in the ETSI rack:
Step 1.
Install screws in the rack rail in the bottom-most hole of the allocated U space to support the chassis temporarily during installation. Make sure that the screws are installed at least half way into the hole. Do not tighten the screw. (Key 2 in
Figure 21 and
Figure 22 ).
Step 2.
With at least two people and, if necessary, using an equipment lift, position the chassis in front of the rack.
Step 3.
Lift the chassis from the bottom and position it in the rack, resting the bottom of the
ETSI brackets (Key 3 in
Figure 21
and Figure 22
) on the temporary screws (Key 2
in Figure 21 and
Figure 22 ).
Step 4.
Insert a screw into each mounting hole. Do not skip any holes. Do not tighten the screws fully.
Note: The oval-shaped holes in the mounting flanges enable you to adjust the alignment of the chassis during installation before you tighten the screws.
Step 5.
Align the chassis in the rack, if required.
Step 6.
Tighten all screws. Refer to the rack manufacturer’s documentation for
instructions. See Torque Specifications for Rack Mounting on page 59
for more information.
Step 7.
Ground the chassis to the building ground. See Chassis Ground Wiring on page 85 .
84 7750 SR-a4 and SR-a8 Installation Guide
