User Manual

AS4000 Access Concentrator
Installation and Commissioning
DLP 003
605-0000-453
Issue 1.2dr Date 7/02/00
Page 6 of 8
XTU Slots 7-14 (Bottom)
B5
A5
IN
B8
A8
IN
B7
A7
IN
B6
A6
IN
SCR 4
SCR 3
SCR 2
SCR 1
SCR 8
SCR 7
SCR6
SCR 5
B1
A1
IN
B4
A4
IN
B3
A3
IN
B2
A2
IN
Overall
Screen
XTU Slots 7-14 (Top)
B5
A5
OUT
B8
A8
OUT
B7
A7
OUT
B6
A6
OUT
SCR 4
SCR 3
SCR 2
SCR 1
B1
A1
OUT
B4
A4
OUT
B3
A3
OUT
B2
A2
OUT
SCR 8
SCR 7
SCR6
SCR 5
Overall
Screen
B5
A5
OUT
B8
A8
OUT
B7
A7
OUT
B6
A6
OUT
SCR 8 IN
SCR 7 IN
SCR 6 IN
SCR 5 IN
B5
A5
IN
B8
A8
IN
B7
A7
In
B6
A6
IN
SCR 8 OUT
SCR 7 OUT
SCR 6 OUT
SCR 5 OUT
Overall
Screen
CTU Slots 4- 6
Figure 11. 120ohm connections to AC shelf
5. 120 Cabling Specification
The cable with the following characteristics to be used for interconnection between the
AC shelf and switch/channel bank: Double screened, 120Ohm, 8 twisted pairs. The
overall screen should be screened with a foil AND a 90% coverage tinned copper
braid.
6. 2Mbit/s 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 link if the 2Mbit/s feeds are fed direct to the equipment.
The length of 2Mbit/s feeds should not exceed 250 metres.
Note: This must be a SELV port of an EN 60950 approved product.
Run the 2Mbit/s cables from the AC shelf to the allocated positions on the DDF. (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 hole on the most convenient 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.