Endace DAG 5.2X, User Manual

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EDM01-33v1 DAG_7.5G4_Card_User_Guide
26 ©2008 Endace Technology Ltd. Confidential - Version 1 - November 2008
relative
Sets TR-TERF to Relative Timed Release mode.
In Relative Timed Release Mode, each packet is transmitted according to its timestamp,
relative to the first packet in the transmit stream. This is shown in the following example
where Packet A will be transmitted immediately, Packet B will be transmitted one second
later and Packet C will be transmitted one second after that:
Packet A: Timestamp = 2006-07-24 03:45:55.9720326 UTC
Packet B: Timestamp = 2006-07-24 03:45:56.9720326 UTC
Packet C: Timestamp = 2006-07-24 03:45:57.9720326 UTC
If for any reason the transmission of Packet B is delayed, the module will still attempt to
transmit Packet C two seconds after Packet A. It will do this even if it means reducing the
gap between Packet B and Packet C.
When using multiple output ports in this mode the timing for each port is independent. This
is shown in the following example where Packet A and Packet B are transmitted at the same
time even though their timestamps are one second apart. Note: The relative placement of the
packets is accurate to ± 100ns.
Packet A (Port A): Timestamp = 2006-07-24 03:45:55.9720326 UTC
Packet B (Port B): Timestamp = 2006-07-24 03:45:56.9720326 UTC
Example
dagconfig relative
no delay
Disables Relative Timed Release mode (No Delay Mode).
In No Delay Mode all packets are transmitted at the maximum rate permitted by the line
interface, using only minimum gaps between packets.
Example
dagconfig nodelay
tx_crc
Enables the crc(fcs) in the transmitted packets CRC(FCS). Ethernet only.
Example
dagconfig tx_crc
dagconfig notx_crc
txonly
Configures the memory hole to only transmit.
Note:
Only displayed if the DAG card supports transmit (i.e. has a terf image).
Example
dagconfig txonly
Note: This option is only applicable on firmware images containing TX.
Txpkts / Notxpkts
Sets whether this DAG card transmits
tx
packets.
Example
dagconfig txpkts
dagconfig notxpkts