User guide

Diagnostics and Troubleshooting 6-15
6
The User 1 Pattern and User 2 Pattern Tests
These two user programmable (up to 24 characters) patterns enable you to generate a
test pattern rather than use pre-programmed patterns or live trafÞc.
The Lamp Test
Use this test to verify the LEDs. During the test, all LEDs on the front panel illuminate.
Troubleshooting Multi-port DSU/CSU Problems
The remainder of this chapter discusses problems and possible solutions.
Tables list problems and the page number in which to resolve the problem:
¥ Table 6-4 on page 6-16
¥ Table 6-5 on page 6-22
¥ Table 6-6 on page 6-24
Required Tools
You need the following tools and equipment to isolate the DSU/CSU from the
network:
¥ A standard T1 test set, such as a T-Berd 211 or equivalent.
¥ A DA-15 male connector with two patch cords for connecting to the T1 test set.
¥ Terminate the patch cords on pins 3 and 11 for the receive pair, on pins 1 and 9 for
the transmit pair.
¥ In lieu of this test set, a T1 loopback plug for isolating the DSU/CSU.
¥ Connect pins 1 and 3, and pins 9 and 11 to construct a T1 loopback plug.
¥ A standard data test set, such as a Fireberd 6000 with a V.35/RS449 interface and
cables.
¥ Hand tools for screwing and unscrewing cables.