Port Features
Page 58
7710 SR OS Interface Configuration Guide
Differences in SONET/SDH Standards
SONET and SDH standards are slightly different with respect to the behavior of K1 and K2 Bytes.
depicts the differences between the two standards.
Table 17: Differences Between SONET and SDH Standards
SONET
SDH
Comments
SONET/SDH standards
use different codes in the
transmitted K1 byte (bits 1-
4) to notify the far-end of a
signal fail/signal degrade
detection.
1100 for signal fail
1010 for signal
degrade
1101 unused
1011 unused
1101 for signal fail
1011 for signal degrade
1100 unused
1010 unused
None
SONET systems signal the
switching mode in bits 5-8
of the K2 byte whereas
SDH systems do not signal
at all.
101 for bi-dir
100 for uni-dir
Not used. 000 is signaled
in bits 5 to 8 of K2 byte
for both bi-directional as
well as uni-directional
switching.
SONET systems raise a mode
mismatch alarm as soon as a
mismatch in the TX and RX
K2 byte (bits 5 to 8) is
detected.
SDH systems do not raise the
mode mismatch alarm.
Содержание 7710 SR OS
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Страница 14: ...Preface Page 14 7710 SR OS Interface Configuration Guide...
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Страница 142: ...Service Management Tasks Page 142 7710 SR OS Interface Configuration Guide...
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