Chapter 1. Introduction
16
November 2001
Diagnostic tests
Test loops -E1 local analog loop back
-E1 local digital loop back
-E1 local payload loop back
-E1 remote analog loop back
-E1 remote payload loop back
-Data port local analog loop back
-Data port local digital loop back
-Data port V.54 loop back
BERT test pattern -511
-2047
-2^15-1
-2^20-1
-QRSS
-2^23-1
-All ones
-All zeros
-ALT
-Double ALT (11001100….)
-3 in 24
-1 in 16
-1 in 8
-1 in 4
RS-232 Craft port
Port interface V.24/RS-232 asynchronous (DCE)
Port connector 9 pin D-type female
Data rate 300, 1200, 2400, 4800, 9600, or 19200 bps
9600 default
Data format -One start bit
-8 data bits
-No parity
-One stop bits
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