TAILIEUCHUNG - HDSL2/HDSL4 LoopShield™ Feature

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 | HDSL2 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. APPLICATION NOTE TL-1 Query via FDL Remote Ground Sensing 1-952-938-8080 1-800-366-3891 Detecting 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

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