User Manual

AS4000 Release3 and Release 4 Central

Terminal Installation and Commissioning

DLP-005

605-0000-432

Issue 1.3a Date 18th October 1999

Page 4 of 4

2. 2Mbit/s Cabling 120Ω Twisted Pair

From the site survey, confirm the location of the Digital Distribution Frame (DDF).

The length of 2Mbit/s feeds from the rack to the DDF should not exceed 250 metres

Note: This must be a SELV port of an EN 60950 approved product.

Run the 2Mbit/s twisted pair cables from the modem shelf to the allocated positions on

the DDF. (Two cables per shelf if using screen twisted pair or one cable if using

screened four wire). In partial equipped installations it may be appropriate to run

enough cables to cater for a complete rack of equipment. Identify and label each cable

at both ends as well as the DDF positions.

Feed the cables through the top of the rack, out through the hole in the right hand side

of the top shelf and down the front of the rack. Tie in cables as necessary using

suitable cable ties, trim, leaving no sharp edges. Fit Ferrites to each cable at the point

of entry to the shelf. Secure a tie wrap each side of the ferrite to keep it in place.

Terminate cables on 9 Way D-Type 2Mbit/s Out 6 & 7, 2Mbit/s In 2 & 3, Screen on 5

& 9. See Figure 17.

9 Way Male (120

ohm)

2Mbit/s In

2Mbit/s Out

Screen

Screen if two cables

Figure 17. 120 balanced connections

For 120Ω balanced operation JP5, JP6 and JP7 should be removed. See Figure 16

3. Channel Bank

Should there be no 2Mbit/s interface available, the Channel Bank will be installed to

interface between the analogue lines of the exchange equipment and the Modem Shelf

in order to provide the required 2Mbit/s traffic link for the AS4000 System.

The 2Mbit/s IN and 2Mbit/s OUT ports on the Modem Shelf are then connected to the

respective 2Mbit/s IN and 2Mbit/s OUT connections on the Channel Bank. Configure

and set the required parameters in the Channel Bank according to the instruction in the

manufacturers manual.