Agilent Technologies 37907A Bedienungsanleitung PDF herunterladen (Seite 11)

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Figure 4: ATM Line Vitals Statistics provides an instantaneouse view of overall network

health.

Capture Filters and Counters

Hardware counters and filters allow the user to select cells or AAL5

PDUs to bring into the capture buffer. With data filtering, the user can

zero in on exactly the data the user needs to see. The filters examine

every cell in real time as it appears on the network. Since the filtering is

done in the hardware, nothing is missed, and the performance of the

measurements and user interface are not compromised.

Up to twelve hardware filters and counters can be enabled

simultaneously and, additionally, any two of the filters can be enabled to

capture all the cells that contain AAL5 PDUs. Flexible and user assisted

menus can be used to define specific filters, counters, and triggers based

on protocol headers (see figure 2). Examples include ATM, LAN over

ATM (to RFC 2684/1483), Frame Relay (FRF.5), LAN over Frame Relay

over ATM (to RFC 2427/1490 and FRF.5 simultaneously), and Classical IP

and ARP over ATM (RFC 2225/ 1577). Filter and counter criteria can be

used to start/stop the data capture and to center the data in the buffer,

the user can see what led up to an event and what followed it. Filter

criteria may also be used to ignore or store the data.

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Agilent Technologies 37907A Bedienungsanleitung Seite 11