Allied Telesis AT-200 Series CentreCOM - Handbuch (Seite 16)

AT-200 Single Port Transceiver
9
❑ AUI cables may have a maximum 257 ns propagation delay, as used for
computing the worst case propagation delay of a cable system

AUI cable propagation delay is approximately 5.13 ns/meter
❑ AUI cable internally consists of four shielded twisted pair wires with an
overall shield and drain wire; a 15-pin D-subminiature male connector at one
end and a 15-pin D-subminiature female connector at the other end
❑ Cable impedance is nominally 78
Ω
❑ AUI cable typically connects a transceiver attached to a coaxial segment to a
DTE (workstation).
Attach the AUI port to cable
If power appears at any pin other than 6 (power return) and 13 (power),
connecting the cable to the transceiver might result in severe damage
to the transceiver and void your warranty.
1. Connect the cable at the station DTE end and test the pins at the
transceiver end to make sure that power does not appear at any pins other
than 6 and 13.
2. Carefully insert the 15-pin D-subminiature connector into the connector on
the transceiver.
3. Move the slide lock to the locked position; this engages the lock posts on the
transceiver.
4. Check the Power indicator on the side of the transceiver to make sure it is
enabled.
Checking Operation
Once installation is complete, make sure that the Power indicator is illuminated.
1. The Power indicator changes color depending upon which position the
heartbeat switch is set.
2. An amber color indicates that heartbeat is enabled (“1” position). A green
color indicates that heartbeat is disabled (“0” position).
Caution
613-10423-00Book Page 9 Monday, March 4, 1996 2:29 PM