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OTS9100 User Manual A-5
Overhead Manipulation Specifications
Subsequent to the default values, the following overhead modifications are possible:
The following bytes can be individually selected and edited:
J0, J1, E1, F1, F2, D1-D3, G1, H4, K1, K2, D4-D12, S1, M1, E2, Z0, Z3, Z4, Z5
C2 of the active POH (all other C2 bytes can be set to a user-selectable 8-bit value)
Z0 bytes 2 through 192 may be edited to a fixed byte value, set to the column number
(ITU G. 783), set to 0xCC (GR-253), or set to a series of Consecutive Identical Digits (CID).
J0 editing: Single byte, 16-byte sequence (ITU-T), 64-byte sequence (SONET)
J1 editing: Single byte, 16-byte sequence (ITU-T), 64-byte sequence (SONET)
Some bytes can be altered through alarm and error generation as follows:
1. Generating errored frames will invert all 192 A1 and A2 bits.
2. Generating RDI-L (MS-RDI) will force least significant 3 bits of K2 to 110.
3. Generating AIS-L (MS-AIS) will force least significant 3 bits of K2 to 111. AIS-L is a
signal with valid section overhead and a scrambled all ones pattern for the line overhead and
payload.
4. B1 error injection inverts one or more bits in one or more B1 bytes.
5. B2 error injection inverts one or more bits in one or more B2 bytes.
6. B3 error injection inverts one or more bits in one or more B3 bytes.
7. REI-L (MS-REI) error injection sets M1 byte to indicate one or more errors.
8. REI-P (HP-REI) error injection sets the four most significant bits of the G1 byte to indicate
one or more errors.
9. LOP error injection sets the H1/H2 pointer bytes to 63/0F for SONET and 6B/0F for SDH.
This equates to a pointer value of 783, which is over the maximum allowable pointer value
of 782.
10. AIS-P (HP-AIS) forces all ones into the H1/H2/H3 bytes and the entire SPE.
11. RDI-P (HP-RDI) has four different defect types. The RDI-P defect forces the G1 byte bits 4-
1 to the following values:
“one bit” RDI-P: ‘100’
Enhanced RDI-P Payload: ‘010’
Enhanced RDI-P Server: ‘101’
Enhanced RDI-P Connectivity: ‘110’
The rest of the POH in the active channel can be set to the user-selected values.
Error Injection
Error Rates: All error rates can be selected in the form X.Y e-Z. See Table A-3 for maximum
and minimum error rates.
Random Errors: Errors are distributed across the entire 10Gb/s signal; includes overhead and
payload.
Random SPE Errors: Errors are distributed across the SPE only (Path and payload).
B1, B2, or B3 single error or error rate is generated by inverting a random bit in the byte.
MS REI/ REI-L: The OC-192 M1 byte is overwritten to convey the error count.