TN771D Maintenance Test Card
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TN771D Maintenance Test Card

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The TN771D performs maintenance functions. These functions include packet bus reconfiguration (allows diagnosis and correction of recoverable packet bus failures before the LAPD links fail) . LAPD provides data transfer between two devices and error and flow control on multiple logical links. It recovers packet bus failures involving up to three malfunctioning leads (one or two data or parity leads and one control lead) by swapping spare leads with the malfunctioning leads. Other maintenance functions include ISDN-PRI testing to originate and terminate loop-back tests on ISDN facilities. It provides bit and block error rate information indicating ISDN facility quality. A TN771D is required in all standard reliability G3rV2 PPNs and critical reliability G3rV2 EPNs, all standard reliability G3sV2 and G3iV2 PPNs when packet end points (BRI and/or ASAI) are supported, and in all critical reliability G3iV2 when packet endpoints are supported.
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Performs maintenance functions for Definity
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