EXFO IQS-8100 Series Transport Blazer for IQS-600 - Manual (Page 249)

SONET Tabs
SONET/SDH Application 235
Line OH TX/RX (SONET)
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The Overwrite LED indicates if there is any byte in any timeslot having
the Overwrite check box selected (LED is green) or not (LED is gray).
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Disable All allows to clear the Overwrite check box for all bytes in all
timeslots.
The following overhead byte values are displayed in hexadecimal format.
However, a common field allows to see the value of specific byte in binary
format. Click on the blue label of a byte and its binary value will be
displayed in the common field beside the Timeslot selection.
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H1 and H2: Pointer
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H3: Pointer Action
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B2: BIP-8
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K1 and K2: Automatic Protection Switching (APS)
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D4 through D12: Data Communications Channel (DCC)
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S1/Z1
S1: Synchronization Status (STS-1 #1 of an electrical or OC-N signal)
Z1: Growth (STS-1 #2, STS-1 #3, up to STS-1 #N of a OC-N (N>3)
signal)
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M0 or M1/Z2
M0: REI-L (STS-1 #1 of an STS-1e signal; STS-1 #4 of OC-192/OC-768
signal)
M1: REI-L (STS-1 #3 of STS-3e or OC-3 signal; STS-1 #7 of an
OC-12/OC-48/OC-192/OC-768 signal)
Z2: Growth (STS-1 #1 up to STS-1 #48 except for timeslots used by M0
and M1).
Undefined “--” for all other timeslots not covered by M0, M1, and Z2.
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E2: Orderwire