User Manual

AS4000 Central Terminal
Installation and Commissioning
DLP 004
605-0000-452
Issue 1.3dr Date 7/02/00
Page 5 of 6
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. If
using protected mode connect the other 2Mbit/s cables to E1IN Slot 9 and E1OUT Slot
9 connectors on the same panel. See Figure 11
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 in Figure 12.
9 Way Female D-Type
2
9
4
1
5
E5 in
E5 out
Screen
A
B
Screen
A
B
6
Figure 17. 120 ohm connection to CT modem shelf.