HDSL2/HDSL4 LoopShield™ FeatureRemote Frame Ground Detection The new HDSL2/4 Remote Frame Ground Detection RFGD feature provides a method for detecting whether or not a frame ground has
Trang 1HDSL2/HDSL4 LoopShield™ Feature
Remote Frame Ground Detection
The new HDSL2/4 Remote Frame Ground Detection (RFGD) feature provides a method for detecting whether or not a frame ground has been connected at the remote HDSL2/4 unit
Overview
ADC’s HDSL2/4 line cards provide visibility of faulty or missing remote chassis frame ground connections on a real-time basis A remote unit not connected to frame ground is susceptible to poor performance and possible damage to HDSL and other transmission equipment This has become an increasingly critical factor in the delivery of T1 service to cell sites Cell sites are particularly vulnerable to power surges, induction and changes in ground potential caused by RF transmission equipment and lightning strikes By determining whether or not frame ground is connected at the remote, the RFGD feature helps the customer to avoid potential problems The remote frame ground detection is measured at the remote line unit and status is
communicated to the CO line unit where it can be viewed both locally and remotely as indicated below
User Interfaces to Remote Frame Ground Detection Feature
There are four major interfaces on the system that can be used to provision the card for Remote Frame Ground Detection RFGD can be provisioned via INTAS query, Management Card Screen, Management Card TL1, and Front-panel Craft Screens In addition to the four interfaces below, alarms can also be seen on the front-panel character display
w w w a d c c o m • + 1 - 9 5 2 - 9 3 8 - 8 0 8 0 • 1 - 8 0 0 - 3 6 6 - 3 8 9 1
INTAS
Acterna T3AS
Titan DCS
HDSL2 Circuit
HDSL2 Remote Card Universal Chassis
220, 3192, DDM+
HDSL2 CO Card
Craft Menu Access
Flashing LED Indication
DS1
Missing Ground Chassis
TL-1 Query via FDL
Network Control
Remote Ground Sensing
Trang 2Detecting Frame Grounds
The remote HDSL2/4 units have hardware and software support that allow them to report the presence
or absence of a frame ground connection at the remote, but not the quality of the connection The detection of a connection to frame ground is not an exact science To detect a connection to frame ground at the remote, the frame ground reference at the CO is used The actual earth ground is then used as the current path between the CO and remote frame ground for detecting a closed circuit The resistance of earth ground varies greatly with soil type, moisture content, and temperature In addition, the distance between the CO and remote greatly affects the resistance Because of all of these
variables, it is extremely difficult to accurately detect a frame ground connection between two points separated by thousands of feet As a result, the design accommodates a range of resistances for determining whether the remote is connected to frame ground
The remote frame ground status is available and valid at the CO only if the remote line unit is
connected, the feature is enabled and the DSL loop is up and running in data mode
Summary
The LoopShield HDSL2/4 RGFD feature enables wireline service providers to detect whether of not remote frame grounds are connected at remote units via several user-friendly interfaces Using this feature to ensure remote frame grounds are connected, services providers can improve customer service
by avoiding many potential problems caused by power surges and changes in ground potential to un-grounded HDSL transmission equipment
ADC Telecommunications, Inc., P.O Box 1101, Minneapolis, Minnesota USA 55440-1101 Specifications published here are current as of the date of publication of this document Because we are continuously improving our products, ADC reserves the right to change specifications without prior notice At any time, you may verify product specifications by contacting our headquarters office in Minneapolis ADC Telecommunications, Inc views its patent portfolio as an important corporate asset and vigorously enforces its patents Products or features contained herein may be covered by one or more U.S or foreign patents An Equal Opportunity Employer
1331747 7/05 Original © 2005 ADC Telecommunications, Inc All Rights Reserved
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