6
•
Electromagnetic wave radiation.
•
Common impedance (including the grounding system) coupling.
To prevent EMI, use the following guidelines:
•
If AC power is used, use a single-phase three-wire power receptacle with protection earth (PE)
to filter interference from the power grid.
•
Keep the router far away from radio transmitting stations, radar stations, and high-frequency
devices.
•
Use electromagnetic shielding, for example, shielded interface cables, when necessary.
Lightning protection
To protect the router from lightning better, perform the following tasks:
•
Make sure the grounding cable of the chassis is reliably grounded.
•
Make sure the grounding terminal of the AC power receptacle is reliably grounded.
•
Install a lightning protector at the input end of the power module to enhance the lightning
protection capability of the power module.
•
Install a special lightning protector at the input end of outdoor signal lines (for example, E1/T1
line) to which interface modules of the router are connected to enhance the lightning protection
capability.
NOTE:
For how to install a lightning protector and surge protector, see "
Connecting the AC power supply to
a power strip with lightning protection
" and "
."
Space
For easy installation and maintenance, follow these space requirements:
•
Reserve a minimum of 1 m (3.28 ft) of clearance between the rack and walls or other devices.
•
For heat dissipation, make sure the headroom in the equipment room is not less than 3 m (9.84
ft).
•
Make sure the rack has enough space to accommodate the router. See
for rack
requirements. For more information about chassis dimensions, see "Appendix A Chassis views
and technical specifications."
Table 7 Router dimensions and rack requirements
Model
Chassis dimensions
Rack requirements
SR6616 AC
SR6616 DC
•
Height
—886 mm (34.89 in)/20 RU
•
Width
—436 mm (17.17 in)
•
Depth
—591 mm (23.27 in)
{
480 mm (18.90 in) for the chassis
{
102 mm (4.02 in) for the cable
management brackets at the chassis front
{
11 mm (0.43 in) for the grounding screw at
the chassis rear
•
A minimum of 0.8 m (2.62 ft) in
depth (recommended)
•
A minimum of 102 mm (4.02 in)
between the front rack posts and
the front door
•
A minimum of 490 mm (19.29 in)
between the front rack posts and
the rear door
