Airspan AS4000, Installation Manual

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Printed Documentation
20
AS4000 AC Rack Cabling and Wiring
AC Rack E1 Cabling 75 ohm
Access Concentrator Interface Panel
All cabling to the access concentrator connects to the interface panel. Slots 4,5 and 6 can be
used for 75ohm and 120ohm connections. Slots 7-14 is used for 120ohm connections each
slot will support up to 8 E1 connections.
Access Concentrator Interface Panel (1026 Board)
Specification : In installations with 75ohm cabling Braided screened, 75ohm, Coaxial Cable
is to be used for interconnection between the AC shelf the DDF and switch/channel bank.
a) E1 Cabling (CT Link)
From the site survey, confirm the location of the Digital Distribution Frame (DDF) if a DDF is
to be used or the CT links if the E1 feeds are fed direct to the equipment. The length of E1
feeds should not exceed 100 metres.
Note: This must be a SELV port of an EN 60950 approved product.
Run the E1 cables from the AC shelf to the allocated positions on the DDF. (8 cables per CTU
in normal working,up to 3 CTUs per shelf.).
In partial equipped installations it may be appropriate to run enough cables to cater for a
complete rack of equipment. This reduces the need to disturb original installation when
adding additional equipment.
Feed the E1 cables through the top hole on the left hand side of rack side of the rack, and
down the channel at the side of the rack.
Identify and label each cable at both ends as well as the DDF/Backhaul positions.
Terminate all cables with BNC co-axial connectors (or it is possible to fit type 43 and adapters
if BNC connectors are not available).