Curtiss-Wright SSR/CHS/001/B, Руководство пользователя

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C
HAPTER
3: O
PERATING A MULTI
-
ROLE RECORDER
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3. Press the EVENT button anytime while recording to place a bookmark.
An event bookmark is an event packet, which marks a place in the recording.
4. To stop recording, move the START/STOP switch to the STOP position.
For more information, see “Viewing recorded files on a PC” on page 26 . For information on this and other settings
such as IP address and multicast group settings, see TEC/NOT/058 - Overview of SNMP and using third party
SNMP tools.
Recording events
Events are used to mark important moments or key events during the recording process. Events may be triggered
through any one of the following control methods:
• Using the EVENT button on the front panel.
• From an event signal received on the 19-pin I/O connector.
• Via an SNMP command from the network.
When an event is generated, a timestamped event packet is created, which is then written to the current PCAP file.
Event packets are described in TEC/NOT/067 - IENA and iNET-X packet payload formats .
The following properties of the event packets can be configured using SNMP:
• eventDestIP sets the destination IP address of the event packets. This can either be 127.0.0.1, or a multicast
IP address.
• eventDestPort sets the destination UDP port number for the event packet.
• eventPacketFormat selects between iNET and IENA packet types.
• eventStreamIdentifier is the Stream ID for the event packet. For IENA packets, this is a 16-bit number. In
iNET packets this is a 32-bit value, with an upper limit of 2147483647.
• eventIenaTrailer is used only with IENA format event packets. It specifies the final 16-bit word of the packet.
About time sources
A multi-role recorder timestamps each Ethernet frame that is recorded in a PCAP file. In the absence of an external
time source, a multi-role recorder uses its local clock to timestamp the recorded packets. A multi-role recorder can
also use an external time source to synchronize its clock for timestamping. The external time sources supported
include GPS antenna, digital IRIG-B time input source, or PTP Grandmaster.
When using GPS or IRIG-B time sources, you can enable a primary and a secondary input. For example, if you set
GPS as the primary input and IRIG-B as the secondary input, then IRIG-B is used as the time source when GPS is
not available. When using a PTP Grandmaster as the time source, you cannot enable a secondary time input.
You can configure time sources using DAS Studio 3.
When using a PTP Grandmaster time source, if the multi-role recorder has not synchronized with a PTP
Grandmaster, then the time is regarded as unreliable. Unreliable time is indicated on the display by the presence of
a question mark after the date.
Estimated remaining time
When recording is in progress and the multi-role recorder is not in wraparound mode, the multi-role recorder
calculates the estimated remaining time based on the current free space on the media and the average incoming
data rate of the previous ten minutes.
As the media becomes full, the remaining time is shown in hours, then minutes, and finally seconds as shown in
the following figure.