User's Manual

Balun Block requirements
Overview
The customer is responsible to convert the 75 ohm unbalanced coaxial cable to 120 ohm
balanced twisted pairs. The conversion of the coaxial cable to twisted pairs may be
accomplished with Alcatel-Lucent balun or equivalent.
Important! The customer shall provide primary protection and the appropriate
hardware to mount and ground the Balun Block.
Balun Block connections
Important! The Balun Block must be installed within 10 m (35 feet) of the 9927
cabinet. The T1/E1 cable will be connected directly to the Balun Block. Four RJ-45
loose connectors will be provided with each Balun Block. The RJ-45 connectors will
be connected to T1/E1 cables during installation of the 9927 Distributed Base Station
Outdoor cabinet. An RJ-45 connector crimping tool is needed to connect RJ-45
connectors to T1/E1 cable twisted-wire pairs. The part number for the RJ-45
connector crimping tool is R-5520.
T1/E1
Input Lines
NIU
T1/E1 lines to Balun Block
Maximum
distance =
10 m
(Provided as
part of site
prep.)
(From service
provider)
Balun
Block
Note 1
T1/E1 Cable
(See Note 2)
(Coaxial cable)
NOTE 1: The Balun Block must be located within a 10 m (35 foot) cable length distance from the
radio cabinet.
NOTE 2: RJ-45 connectors must be installed on T1/E1 cables before T1/E1 cables can be
connected to a Balun Block. There can be up to two T1/E1 cables. Each T1/E1 cable
contains 24 twisted-wire pairs. Three branch cables can go to a Balun Block. Each branch
cable contains 8 twisted-wire pairs. Each balun block accepts 8 twisted-wire pairs or 4 T1 lines.
Each T1 line contains 2 twisted-wire pairs. Therefore, a cable with 24 twisted-wire pairs
contains 12 T1 lines and requires 3 Balun Blocks.
A 9927 Distributed BTS Outdoor Cabinet
populated with URC-IIIs (which allow up to 20 lines). In this case, 16 of the 24 twisted-wire
pairs would be used. Refer to Balun Blocks #4 and #5 in the following table.
second 24 twisted-wire pair cable is required for a
(35 feet)
with
primary
protection
To 9927 Distributed
BTS Outdoor Cabinet
Site preparation -- T1/E1 and User Alarm facilities for 9927
Distributed Base Station Outdoor Cabinet
Balun Block requirements
....................................................................................................................................................................................................................................
....................................................................................................................................................................................................................................
14-2
Alcatel-Lucent – Proprietary
Use pursuant to applicable agreements
9927 Dist BTS Outdoor
401-703-516
Issue 1 March 2012