eSpace IAD
Troubleshooting
3 Co mmon Troubleshooting Methods
Issue 02 (2012-02-29)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
92
No.
Specifications
5
Only the specified device can be used as components for the electrical
connection of the ground cable.
Table 3-9
IAD ground specifications
No.
Specifications
1
All communication devices and auxiliary devices (such as mobile base station,
transmission devices, switches, power supply devices) in the equipment room
must be grounded for protection. Connect all PGND cables for various devices
jointly to a general ground bar, and then to the same PGND bar together with
the PGND of devices in the room.
2
The PGND of the equipment is shorted to the copper protection ground bar
provided by the customer. The short-circuiting cable used should be an
alternating yellow and green plastic insulating one with copper core, with
cross-sectional area greater than 35 mm
2
.
3
There are ground terminals and ground flags at the lower part of the front door,
rear door and side panel of the cabinet, connected to the ground terminals of
the cabinet framework through connection cables with cross-sectional area no
less than 1.6 mm
2
.
4
Keep all metal components of a cabinet in good conductibility. No insulating
coating can be sprayed on the connection betw een the metal components.
5
Connect the cabinets in the same row closely by fastening captive screws and
gaskets on the top of the cabinets. Do not spray coating into a rectangle area of
30 x 50 mm around the connection hole for captive bolt. Measures to prevent
rust and corrosion must be taken for this area. Zinc electroplating with
iridescent yellow chromate conversion coating should be applied to the gasket
and nut to ensure sufficient electric contact.
6
During combination cabinets of the same type, short-circuiting cables are used
to connect the ground busbars (if any) of the cabinets. The cross -sectional area
of the short-circuiting cable is 6 mm
2
and the length is less than 300 mm.
Connect the two ends of the short-circuiting cable respectively to the ground
busbar terminals on the neighboring cabinets and fix them firmly.
Table 3-10
Communication cable ground specifications
No.
Specifications
1
The AC power supply system of the equipment room uses the TN-S power
supply mode.
2
The inlet for the AC power cable at the equipment room should be equipped
with a lightning protection device with a nominal discharging current not less
than 20 kA.
3
The protection ground for power supply and that for devices share the same
