User's Manual

Table Of Contents

CATC MERLIN MOBILE 1.00 CHAPTER 8

User’s Manual Reports

DRAFT

The throughput calculation only includes actual payload data bytes. The access code,

packet header, payload header, and payload CRC of each packet are not included in the

calculation. The result is given in units of bits per second (bps). The throughput is

calculated by multiplying the total payload bytes in the packet range by 8, then dividing

the product by the total time.

• Bit error rate

The Bit Error Rate (BER) is displayed in units of parts per million (ppm).

Bit errors are calculated by multiplying the uncorrectable payload errors by 2, then taking

that product and adding it to the correctable header errors plus the correctable payload

errors.

The bit error rate is calculated by dividing the bit errors by the total bits and multiplying

the quotient by 1,000,000.

Note: Since the analyzer can't determine the number of bit errors in packet payloads

not protected by FEC, the payloads of these packet types are not included in

the bit error rate calculation: DH1, DH3, DH5, AUX1, and HV3.

Note: The analyzer can't determine the exact number of bit errors present when an

uncorrectable payload error is detected in a packet protected by 2/3 FEC

(HV2, DM1, DM3, DM5, FHS). As a statistical approximation, when an

uncorrectable payload error is detected in such a packet, it is assumed that

there were two bit errors present.

8.4 Traffic Summary

The Traffic Summary report (Figure 8-4) displays a categorized summary of the traffic in

the active Trace.

To access the Traffic Summary report:

• Select Report > Traffic Summary from the menu bar or click the Traffic Summary

button on the toolbar. The Traffic Summary report appears in its own window.

Throughput

Total payload bytes in packet range 8×

Total Time

-------------------------------------------------------------------------------------------------

Bit Errors Correctable header errors Correctable payload errors 2 Uncorrectable payload errors×()++=

Bit Error Rate

Bit errors

Total bits

-------- --------- ---- --

1,000,000×=