ADTRAN T1-FT1 User Manual

Contents

ADTRAN T1-FT1 User Manual Manual pdf 27 page image

Chapter 1. Introduction61200060L1-1 TSU User Manual 1-11TSU TestingCurrently the TSU offers three forms of testing.• Self Test• Loopback Tests• Pattern generation and checkSelf TestsThe self test checks the integrity of the internal operation ofthe electronic components by performing memory tests andby sending and verifying data test patterns through allinternal interfaces. Although actual user data cannot bepassed during these tests, the self test can be run with thenetwork and DTE interfaces in place and will not disturb anyexternal interface.The self test automatically executes upon power up. It canalso be commanded from a front panel menu or from thecontrol port.In addition to the specified self tests, background tests arealso run on various parts of the internal electronics. Thesewill run during normal operation to confirm continuedcorrect functioning. The background tests include; 1)monitoring the phase locked loop for lock, 2) the standardbackground network performance monitoring, as requiredby ANSI T1.403 andAT&T 54016 for which the results arestored.Loopback TestsA number of different loopbacks can be invoked locally fromthe front panel, by T-WATCH commands or remotely byusing special inband codes (AT&T D4 network loop up andloop down codes; V.54 loop up/loop down codes for theNx56k/64k serial interface). Additionally the loopbacks canbe remotely controlled by out-of-band commands via the T1ESF FDL, or from T-WATCH via a modem connection.