User manual
Chapter 2 Inspection and Installation TSU ACE User Manual
24 © 2003 ADTRAN, Inc. 61202295L1-1A
Network Interface (NI)
The Network Interface (NI) port provides the connection to the T1/FT1. It complies with the applicable
ANSI and AT&T standards.
V.35 Nx56/64 Serial Interface
The Nx56/64 serial interface operates at the following data rates: N*56K or N*64K, where N=1 to 24
(DS0s).
POWER UP TESTING & INITIALIZATION
Self-Test
When shipped from the factory, the TSU ACE is set to factory default conditions. When you first
power-up, the unit automatically executes self-tests followed by an initialization sequence which sets up
the unit. 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 run with the network and
DTE interfaces in place, without disturbing any external interface.
The self-test automatically executes upon power-up. It can also be commanded from a front panel menu.
In addition to the specified self-tests, background tests are run on various parts of the internal electronics.
These run during normal operation to confirm continued correct functioning. The background tests include
the following:
• Monitoring the phase-locked loop for lock.
• Standard background network performance monitoring.
The self-test works as follows:
The automatic self-test consists of the following tests:
• Board level tests
• Random access memory (RAM) tests; erasable programmable read only memory (EPROM) checksum
• On-board data path. Sending a known test pattern through an on-board loop
• Unit level tests
• Front panel LED verification
• Phase lock loop verification
If... Then...
a power-up (or commanded) self-test occurs the LCD displays ADTRAN TSU INITIALIZING and the LEDs
illuminate sequentially.
the self-test completes with no failures detected the LCD momentarily displays ALL TESTS PASSED.
a failure is detected it is displayed in the LCD window.