ADTRAN TSU 600 - Manual (Page 32)

Chapter 1. Introduction
20 TSU 600 User Manual 61200.076L2-1
Pattern Generation
The TSU 600 offers two available test patterns: QRSS
and 511.
QRSS Pattern
The QRSS pattern is commonly used to simulate real
data in T1 interfaces. This pattern can be assigned to
appear in all DS0s or only in TST DS0s. When QRSS is
set in all DS0s and one of the network loopbacks
previously described is activated at the far end, a total
end-to-end integrity check can be run without the
need for any external test equipment. When QRSS is
assigned to TST DS0s, an integrity check of the link
can be run along with normal data flow. The TST
DS0s are user assigned as part of the DS0 Map.
511 Pattern
The 511 pattern is generated and checked by an
Nx56/64 serial interface option card. It only appears
in the DS0s assigned to the Nx56/64 port which is
generating the pattern. When used in conjunction
with the port loopback at the far end as previously
described, an end-to-end integrity check can be made
on the DTE ports.