User guide

5-14 Solo E1 DSU User Guide—June 1998
5
The pattern tests are listed in Table 5-7.
Table 5-7 Pattern Tests
Pattern Test Description
Send All Ones Use this test to expand circuit as a maximum density signal, it is also used to
test synchronization circuits.
Send All Zeroes Use to test the zero suppression circuit. As a minimum density signal, it is also
used to test synchronization circuits.
Send 1:1 This pattern sends alternate ones and zeros. It is used in testing for bridge
taps.
Send 1:2 Pattern The 1:2 code is the standard loopdown remote code. Use it when the
loopdown remote test fails to terminate the remote loopback. You can
determine if the failure is an intermittent or hard failure by continuously
sending the 1:2 and monitoring the network status to see if the pattern is
being received.
Send 1:4 Pattern The 1:4 code is the standard loopup remote code. It is typically used when the
loopup remote test fails to put the remote unit into loopback. You can
determine if the failure is an intermittent or a hard failure by continuously
sending the 1:4 code and monitoring the network status to see if the pattern is
being received.
Send 1:7 Pattern This pattern stresses the timing recovery circuits of repeaters and other
intermediate equipment.
Send 3:24 Pattern This pattern tests for ones density (consecutive zeros) tolerance on AMI lines.
User 1/User 2 Patterns These two user programmable patterns (up to 24 characters) enable you to
generate a test pattern rather than use pre-programmed patterns or live traffic.
QRW Pattern The Quasi-Random Word (QRW) test measures Bit Error Rates on the E1
network. The Solo E1 CSU sends a QRW into the network and monitors the
received E1 network signal for QRW bit errors.