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An “unused payload reference” sub-rectangle (always white). This indicates the unused portion of a
maximum payload. It is the remaining portion of the “max actual payload reference” rectangle. The
packet in the air does not leave room for this. It is indicated for reference only.
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A “max speed reference” rectangle (dashed lines). This is used to extend the height to that of a 3
Mbits/sec packet, and appears only for packets whose speed is less than that. The packet shown here has
a speed of 1 Mbit/sec because the height of the other rectangles is 1/3 of the total height.
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The part of the “max packet on wire reference” rectangle (light solid lines) that trails the “max actual
payload reference” rectangle (dark solid lines) is partly packet in the air (if the payload on the wire
contained FEC) and partly trailer (CRC, etc). There is always a trailer, so there is always a little space
(subject to round off error and pixel granularity) between the ends of the two rectangles.
This table shows how packets are colored:
Packet Category Packet Types
Color
ALC DM1, DM3, DM5, DH1,
2-DH1, 3-DH1, DH3,
2-DH3, 3-DH3, DH5,
2-DH5, 3-DH5, AUX1 Black
SCO HV1, HV2, HV3, DV Pink
Table 4.4 - Packet Type Colors
Chapter 4 Capturing and Analyzing Data TELEDYNE LECROY
Frontline BPA 600 Hardware & Software User Manual 114