User's Manual

Printed Documentation
58
1. Shelf Interface Connections.
75 Ohm Connections
Run the 2Mbit/s co-axial cables from the modem shelf to the allocated positions on the
DDF/Backhaul. (Two cables per shelf in normal working, four cables per shelf in protected
mode). 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 2Mbit/s cables through the top left-hand side of the rack, and down the front 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.
Connect the 2Mbit/s ports on the DDF to E1IN Slot 5 and E1OUT Slot 5 BNC connectors
on shelf interface connections located on the modem shelf interface panel.
Ensure that the respective 2Mbit/s ports have been configured on the DDF/Backhaul
Tie in cables as necessary using suitable cable ties, trim, leaving no sharp edges.
120 Ohm Connections
Run the 2Mbit/s 120 ohm cables from the modem shelf to the allocated positions on
the DDF/Backhaul. 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 2Mbit/s cables through the top left-hand side of the rack, and down the front
of the rack.
Identify and label each cable at both ends as well as the DDF/Backhaul positions.
Terminate all cables with 9 pin D-Type connectors. Terminate as detailed below.