
Connect T1/E1 cables and User Alarm cables to NIU
The T1/E1 and User Alarm facilities must be in place prior to installation of the 9927
Distributed Base Station Outdoor Cabinet. The service provider usually supplies a carbon
or gas tube protector for the T1/E1 facility. The 9927 Distributed Base Station Outdoor
Cabinet is already equipped with Listed primary surge protection. If required, a Balun
Block must also be installed to balance the impedance of the coaxial cable with the
impedance of the twisted-wire pairs at the Network Interface Unit (NIU).
The required twisted-pair cable must be supplied and connected to the T1/E1 facility at
the NIU, as part of site preparation. Sufficient cable length must be coiled to allow for
future connection to the Enhanced Facility Interface Module (EFIM) inside the 9927
Distributed Base Station Outdoor Cabinet. The appropriate number of T1/E1 cables must
be available at the site prior to installation.
Important!
In the United States, refer to Article 800 of the National Electrical Code,
NFPA 70, for selection and installation of the primary protector. In Canada, refer to
Section 60 of the Canadian Electrical Code, Part 1, CSA C22.1 for selection and
installation of the primary protector.
For international applications, refer to ITU K.11, “Principles of Protection Against
Over-voltages and Over-currents.”
Important!
Unused or spare T1/E1 cables at the NIU
must not
be looped back
towards the 9927 Distributed Base Station Outdoor Cabinet while the cabinet is in
operation.
The twisted-pair cable must be installed in a dry location with minimal humidity. The
installation must not be performed in extremely cold temperatures [-15 °C (5 °F) or less]
(see
“Minimum installation temperatures” (p. 5-4)
It is recommended that the T1/E1 cable shield be bonded at the end that connects to the
NIU.
Install rigid NIU conduit and flexible T1/E1 conduit
This topic describes the conduits required for T1/E1 and User Alarm cables. T1/E1 and
User Alarm cables are routed through the conduits that are already in place for the 9927
Distributed Base Station cabinet.
Rigid NIU conduit is required to bring T1/E1 and User Alarm cables to the site. It is the
customer's responsibility to provide rigid conduit and all required connectors and fittings.
The customer must also install these in site preparation.
Site preparation -- T1/E1 and User Alarm facilities for 9927
Distributed Base Station Outdoor Cabinet
Site preparation for T1/E1 and User Alarm cables
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14-4
Alcatel-Lucent – Proprietary
Use pursuant to applicable agreements
9927 Dist BTS Outdoor
401-703-516
Issue 1
March 2012