Table of Contents
Advertisement
Installation Manual –Hardware Installation
BBU3806 WCDMA Base Band Unit
6.5.2 Connecting E1/T1 Cable
The DB9 male connector connects to the E1/T1 port of BBU3806, and the SMB
female connector to the peer end.
Connect the E1/T1 cable by following the principles below:
The TX end of the trunk cable from BBU3806 must connect to the RX end of the
cable from the peer end.
The RX end of the trunk cable from BBU3806 must connect to the TX end of the
cable from the peer end.
Connections between E1 cables from BBU3806 and its peer end depend on
specific data configurations.
If the trunk cable from BBU3806 is coaxial at 75 ohm and the cable from the peer
end of BBU3806 is a 120-ohm twisted pair one, you must connect the two types
of cables through an adapter or a transit cable.
6.5.3 Wiring Principles for E1/T1 Cable
Route the E1/T1 cable by following the principles below:
Do not rout the E1/T1 cable overhead outside the equipment room.
If the E1/T1 cable has to go outside the equipment room, route them
underground through a metal pipe. Ground both ends of the pipe securely.
If the E1/T1 cable has to go outside the equipment room and fails to be routed
underground, you shall:
securely. For the section of the cable led into the equipment room, connect it to
the protection grounding bar for sound grounding.
layer securely. For the section of the cable led into the equipment room, connect
it to the protection grounding bar for sound grounding.
Ground the idle wire pairs of the E1/T1 cable inside the equipment room. For
example, you may connect the idle core wires and shielding layer of the E1/T1
cable to a small metal plate, lead a grounding cable from the plate, and then
connects it to the protection grounding bar inside the equipment room.
Do not cross the E1/T1 cable with the power cable, grounding cable, and feeder.
When routing the E1/T1 cable in parallel with the above three types of cable,
keep it at least 30 mm away from any of the cables.
Route the cable nicely and neatly, and secure it with cable ties.
Make sure the radius of any bent is 20 times larger than the diameter of the
cable.
Shield the cable through a metal tube. Ground both ends of the tube
Choose the cable with an outer metal layer. Ground both ends of the metal
Huawei Technologies Proprietary
6-7
Chapter 6 Installing Cables
Advertisement
Table of Contents
