Cisco Cisco Aironet 1400 Wireless Bridge Installation Guide
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Cisco Aironet 1400 Series Wireless Bridge Mounting Instructions
OL-7618-01
Routing the Cables
Step 7
Weather seal all external coaxial connectors by wrapping them with the sealant tape provided in the
installation kit. For more information, see the
installation kit. For more information, see the
Note
Do not weatherproof or permanently secure all connections until after final antenna alignment.
Grounding the Cables for Lightning Protection
For long outside cable runs, you must ground the shields of the RG6 coaxial cables to the tower at regular
intervals. This precaution helps protect the bridge and the power injector from lightning damage. The
recommended spacing between grounds is 100 ft (30 m). In areas of especially high lightning risk, space
the grounds even closer. Make sure each grounding block makes good electrical (metal-to-metal) contact
with the tower or a metal surface.
intervals. This precaution helps protect the bridge and the power injector from lightning damage. The
recommended spacing between grounds is 100 ft (30 m). In areas of especially high lightning risk, space
the grounds even closer. Make sure each grounding block makes good electrical (metal-to-metal) contact
with the tower or a metal surface.
Caution
Make sure to comply with the tower owner's policies and local codes. Drilling into tower structures or
other alterations can affect the tower's long-term integrity.
other alterations can affect the tower's long-term integrity.
In lightning environments, optional lightning arrestors (or protectors) should be installed for each coax
cable at the building entrance. Mount the lightning arrestors at the building entrance and ground them in
accordance with the manufacturer’s instructions. In very high lightning environments where arrestors
with replaceable gas tubes are desired, use Huber+Suhner lightning arrestors
(part number 3401.99.0022). In less severe lightning environments where lower cost, non-replaceable
gas tube protectors are desired, NexTek lightning arrestors (PTC-C030) or equivalent can be used. For
additional information on the lightning arrestors, see the websites of NexTek and Huber+Suhner.
cable at the building entrance. Mount the lightning arrestors at the building entrance and ground them in
accordance with the manufacturer’s instructions. In very high lightning environments where arrestors
with replaceable gas tubes are desired, use Huber+Suhner lightning arrestors
(part number 3401.99.0022). In less severe lightning environments where lower cost, non-replaceable
gas tube protectors are desired, NexTek lightning arrestors (PTC-C030) or equivalent can be used. For
additional information on the lightning arrestors, see the websites of NexTek and Huber+Suhner.
Routing the Cables
To route and connect cables, follow these steps:
Step 1
For unassembled coax cables:
a.
Unspool two 75-ohm cables, laying them out straight without kinks. Do not cut the cables until you
know the required length between the bridge and the first grounding block and between each of the
remaining grounding blocks.
know the required length between the bridge and the first grounding block and between each of the
remaining grounding blocks.
Note
Add an extra cable length for service loops at both ends.
b.
Install F-connectors on the cable ends before climbing the tower.
Step 2
Tie a rope near the end of two cables, and secure it using black electrical tape, making sure the
connectors do not support any cable weight.
connectors do not support any cable weight.
Step 3
From the tower, use the rope to pull the cables up from the ground, making sure they pass along a tower
member where they can be securely fastened.
member where they can be securely fastened.
Step 4
Connect the cables to the bridge connectors and install service loops (also called a drip loop). The cables
should slope downward so that moisture runs away from the connectors during rainstorms.
should slope downward so that moisture runs away from the connectors during rainstorms.