Service manual

Appendix C Functional Description C-15
FIGURE C-5 Ensuring a 10BASE-T Host-to-Hub Communication Network
C.1.11.2 Technical Discussion
The TPE link integrity test determines the state of the twisted-pair cable link
between the network host and hub. Both the host and hub regularly transmit a link
test pulse. When either the host or hub has not received a link test pulse within a
certain amount of time (50 - 150 ms), it makes the transition from the link-pass state
to the link-fail state and remains in the link-fail state until it once again receives
regular link test pulses.
The link integrity test is specific to TPE and is not applicable to the other physical
layer implementations of IEEE 802.3 such as 10BASE5 (thicknet) or 10BASE2
(thinnet).
Ultra 2 Series
Ultra 2 Series
Ultra 2 Series
Hub
Hub
Hub
Link Test
Enabled
(Default)
1
Link Test
Enabled
1
Link Test
Enabled
(Default)
1
Link Test
Disabled
0
Link Test
Disabled
(Reset)
0
Link Test
Disabled
(Reset)
0
Link Test
Enabled
1
Link Test
Disabled
0
Two-Way Communication
Two-Way Communication
Ultra 2 Series may boot
successfully, but other hosts
in the network cannot
communicate with the
Ultra 2 Series.
Ultra 2 Series may boot
successfully, but with “lost
carrier” or “no carrier” error
messages.
Ultra 2 Series
Hub