TTC T-BERD 107A, Справочное руководство

Страница: 80 / 261

SECTION 3
3-41
INSTRUMENT
DESCRIPTION
55 OCTET — This 55-octet pattern can be
used to stress test repeater timing recovery
and ALBO circuitry. The pattern consists of
rapid transitions from high ones density octets
to low ones density octets. When the pattern is
frame aligned, it violates the maximum zeros
and ones density criteria. The pattern should
only be transmitted over the repeatered span
and not the network.
MIN/MAX — This 72-octet minimum/maximum
density pattern can be used to stress test repeater
pre-amplification, equalization, and ALBO cir-
cuitry. The pattern consists of rapid transitions
from low ones density to high ones density
octets. When the pattern is frame aligned, it
meets the maximum zeros and ones density
criteria.