Specifications
OTS9100 User Manual A-7
Receiver (Analyzer) Specifications

Measurements

B1 Errors: The 9.95238 Gb/s input is monitored for Section level (Regenerator Section) errors by
comparing the received B1 byte to the recomputed BIP-8 parity. The errors are detected and
counted.
B2 Errors: The 9.95238 Gb/s input is monitored for Line (Multiplex Section) errors by
comparing the 192 received B2 bytes to the recomputed BIP-8 x 192 (BIP-24 x 64) parity. The
errors are detected and counted.
B3 Errors: The 9.95238 Gb/s input is monitored for Path level errors of the active channel by
comparing the received B3 byte to the recomputed BIP-8 parity. The errors are detected and
counted.
REI-L/MS-REI: The 9.95238 Gb/s input is monitored for REI-L/MS-REI in the M1 byte. The errors
are detected and counted.
REI-P: The 9.95238 Gb/s input is monitored for REI-P. The errors are detected and counted.
Frame Alignment Sequence Errors (FAS): The last two A1 bytes and the first two A2 bytes (A1,
A1, A2, A2) of the 9.95238 Gb/s input are monitored for errors.
For SDH, B1, B2, B3, MS-REI per G.821 and G.826, unavailability per G.827.
For SONET, B1, B2, B3, REI-L per GR-253-CORE.
Error counts for the following are available through the receiver: Errored Blocks, Errored Seconds,
Severely Errored Seconds, Unavailable Ratio, Unavailable Seconds, Errored Seconds Ratio,
Severely Errored Seconds Ratio, Consecutive Severely Errored Seconds Periods, Background Block
Errors, Background Block Error Ratio, Total Count, Available Errored Blocks, Available Errored
Seconds, Available Background Block Errors, Available Severely Errored Seconds, and BER.

Alarms Detection

LOS: 9.95238 Gb/s input is monitored for the all zeros condition. When the 10 Gb/s signal has been
off for more than 2 microseconds the LOS condition is declared. The LOS alarm will assert no later
than 127 microseconds after receiving the low signal (all zeros) condition.
LOF, SEF: If 4 or more consecutive frames have FAS errors, then SEF is declared and reframing
is attempted. If SEF persists for more than 3 milliseconds, LOF is declared.
AIS-L: The K2 byte is monitored for occurrence of all ones in three least significant bits.
• SONET: If it occurs in five consecutive frames AIS-L is declared.
• SDH: If it occurs in three consecutive frames MS-AIS is declared.
RDI-L: The K2 byte is monitored for occurrence of the '110' code in three least significant bits.
• SONET: If it occurs in five consecutive frames RDI-L is declared.
• SDH: If it occurs in three consecutive frames MS-RDI is declared.
AIS-P: If the pointer equals 3FF for three to five frames, then AIS-P is declared.