Test Functions
346 MAX-800 Series
OH - SONET/SDH
B2: BIP-8
SONET: The BIP-8 (Bit-Interleaved Parity) byte provides line error
monitoring. This byte is only defined for the first STS-1/STM-1 frame of a
composite signal. The byte is calculated by performing a routine
even-parity check over all bits of the LOH and the STS-1 frame capacity
of the previous frame of a composite signal (STS-1 to STS-n). Note that
the SOH is not used to calculate the parity check.
SDH: The MS BIP-N*24 (Bit-Interleaved Parity) byte provides line error
monitoring. The byte is calculated by performing a routine even-parity
check over all bits of the MSOH and the STM-N frame of the previous
STM-N frame. Note that the RSOH is not used to calculate the parity
check.
K1 and K2: Automatic Protection Switching (APS): The K1 and K2 bytes
communicate APS between two LTE. These bytes are only defined for
the first STS-1/STM-1 frame of a composite signal.
D4 through D12: Data Communications Channel (DCC): The D4
through D12 bytes provide a 576 Kbit/s data communications channel
between two LTEs for administration, monitoring and other
communications. These bytes are only defined for the first STS-1/STM-1
frame of a composite signal.
S1/Z1 (SONET)
S1: Synchronization Status: The S1 byte is used to carry the
synchronization status of the SONET device. This byte is only defined
for the first STS-1/STM-1 frame of a composite signal.
Z1: Growth. This byte is located in the second STS-1 through STS-n
frame of a composite signal (STS-1 #2, STS-1 #3, up to STS-1 #N of a
OC-N (N>3) signal).
S1 (SDH): Synchronization Status. Bits 5 to 8 of the S1 byte are used to
carry the synchronization messages of the SDH device. This byte is only
defined for the first STS-1/STM-1 frame of a composite signal.
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