ADTRAN T1-FT1 user manual TSU Testing, Self Tests, Loopback Tests

Chapter 1. Introduction

TSU Testing

Currently the TSU offers three forms of testing.

•Self Test

•Loopback Tests

•Pattern generation and check

Self Tests

The self test checks the integrity of the internal operation of the electronic components by performing memory tests and by sending and verifying data test patterns through all internal interfaces. Although actual user data cannot be passed during these tests, the self test can be run with the network and DTE interfaces in place and will not disturb any external interface.

The self test automatically executes upon power up. It can also be commanded from a front panel menu or from the control port.

In addition to the specified self tests, background tests are also run on various parts of the internal electronics. These will run during normal operation to confirm continued correct functioning. The background tests include; 1) monitoring the phase locked loop for lock, 2) the standard background network performance monitoring, as required by ANSI T1.403 andAT&T 54016 for which the results are stored.

Loopback Tests

A number of different loopbacks can be invoked locally from the front panel, by T-WATCH commands or remotely by using special inband codes (AT&T D4 network loop up and loop down codes; V.54 loop up/loop down codes for the Nx56k/64k serial interface). Additionally the loopbacks can be remotely controlled by out-of-band commands via the T1 ESF FDL, or from T-WATCH via a modem connection.

61200060L1-1 TSU User Manual 1-11