EXFO FTB-8100 Series Transport Blazer for FTB-200 - Manual (Page 187)

SONET Tabs
SONET/SDH Application 175
Section OH TX/RX (SONET)
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J0/Z0
J0: Trace: STS-1 #1 of an electrical or OC-N signal. J0 is only available
when the Enable Trace check box from the Section TX (SONET) on
page 169 is cleared.
Z0: Growth: STS-1 #2 to STS-1 #N of a OC-N signal.
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B1: BIP-8. This byte is not programmable from this tab
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E1: Orderwire.
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F1: User.
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D1, D2, and D3: Data Communications Channel (DCC).