K type pad
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....The following discussion concerns the use of a K pad on a TimeSpan carrier system.
It is my hope you can gain some benefit from digesting the contents of this page with minimal indigestion. Eno will not be shipped with the pads!.
1997 © D2M.
Figure 1
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The above is an overview of the wiring needed to sucessfully attenuate a circuit via an Ericsson TimeSpan carrier system at the remote cabinet. The 8500-29 cards (UFC P4U00101P) are not field adjustable, unless you want to cause possible harm from a repairshopman to yourself!
- a dual K-pad holder (with afixing velcro)
- 2 carefully chosen K pads
- This document
- suitable interconnection device to connect to the CXR.
The underlying problem is the need to attenuate the circuit of natural analogue data transported from the remote cabinet to copper facilities. The TLP of typical data at the copper point is generally -8db Tx and -16db received. To avoid multiple problems with circuit operation and subsequent related trouble to other circuits the output from the 8500-29 card must be dropped to an acceptable level.
This is acheived with the above items, listed here:
The diagram is the connection method for the pads between the carrier and the copper plant. Also required is a suitable block, terminal or such to connect between the carrier and the copper facility connection blocks at the CXR cabinet with suitable jumper wire. Commonly available is the "CCB" block. If you are familiar with these which are the screw terminal and jack with cover block commonly used indoors within domestic applications. The screw terminals are excellent for the terminating the stranded wire of the K pad socket and allowing you (or the poor repairman) to remove the pad from the circuit with the jack/plug assembly.
With the assistance of this document and caution relating to polarity the CCB block / pad combination can be trouble free. Removal of the plug from the CCB block and insertion of a double ended cord to the CCB block will easily remove the pad from the circuit for trouble shooting purposes.
The pads are not common but are necessary to keep the circuit to proper spec. Some cabinets have been provided with a strip type of holder assembly which renders this document as only a guide to the use of the pads. Additional pads or wiring would not be required.
Sample exerpt from a genesys job: (one pair shown - CO Tx)
A - Z Transmit:
4SC4
TYPE:TIMESPAN
CH:40
SYS:701
TYPE:8500-29
UFC:P4U00101P
ISS NO:1
A-Z: 2.0 Z-A:19.7
The final notation denotes padding of 2.0db on the Rx channel & 19.7db on the Tx channel.
Further details will be added as required. 971114
During your adventure here at the D2M, please feel free to comment aloud.
The drawing was accurate to the best of my knowledge.
No warranty is implied nor given.
The diagram mentions some typical CIMM part numbers for the K pads, a comprehensive list can be composed and if time permits...
Pads are available in increments of .2db from 0.0 to about 30db. This would attenuate just about any situation that could possibly arise.
The part number for the holder has eluded me. Research continues. Stay tuned.
D2M © 1997 1998 1999 MacMcLellan A graduate of Curmudgeon Emeritus.