Black Box TS560A, Руководство пользователя

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One tester is put into Validate Link mode (Validator),
while the other one is put into PING test with DHCP Off
(PING Generator). The Validator will be locked in NIC
mode, generating link pulses that the PING Generator
can receive to allow it to take on the hub cable
configuration.
Once the PING Generator detects the Link pulses, it will
go into the active PING state and start generating ARP
packets, attempting to connect to both the manually
configured target and router IP addresses. The Validator
will then assume that IP address and respond to the
ARP. The PING Generator then starts to PING the IP
address that the Validator has responded to. The
Validator responds to the PING, but it modifies the
packet instead of merely copying it so that the PING
Generator can recognize when it is communicating with
a Validator. When the PING Generator recognizes the
Validator’s response, it will change its PING status
acronym display to “Val” and terminate the PING
conversation to the other IP address it is configured for.
Once this negotiation is complete, the Validator will
show a count of PINGs received, and the PING
Generator will display the normal PING status screens
for monitoring the progress of the test.
CHAPTER 4: Functional Description