AT-3624TS Connectivity
22
UTP Hub-to-MAU Wiring
For a 10BASE-T link between a hub and a Media Access Unit (MAU)
transceiver or Network Interface Controller (NIC), the cable is wired
straight-through. That is, an RJ45 receptacle at the hub would wire pin-
to-pin to the RJ45 receptacle at the MAU. The AT-3624TS follows IEEE’s
10BASE-T hub standard for an embedded cross-over function. Each port is
an MDI-X interface with the receive and transmit pairs crossed internally.
Note
For information on UTP cabling, refer to the 10BASE-T section in
Appendix A.
LED Displays
Hub Indicators
LED indicators appear on each AT-3624TS repeater. The LEDs
intentionally do not reflect real-time activity, because a data packet is too
fast for the human eye to distinguish on the LED indicator; therefore, the
hub artificially stretches the LED ON time for observation. LED
indicators for the AT-3624TS repeater are described below:
POWER—Green whenever power is applied.
FAULT (OFF under normal operational conditions)—Stays red for a very
short time while power-ON/reset diagnostics are run; remains solid red if
a malfunction is detected during the diagnostics.
ACTIVITY—The Activity indicator will flash when Ethernet packets are
being transmitted to all repeater ports.
Port Indicators
The AT-3624TS port indicators are located on the repeaters’ front panel.
They provide visual diagnostic and activity information for network
analysis. Each 10BASE-T port supports the following indicator functions
with one two-color front panel LED per port:
LINK (Solid Green)—This indicates that the particular port has a valid
link and is not partitioned.
RECEIVING (Flashing Green)—When a port’s LED is blinking, the port
is receiving Ethernet packets.
PARTITIONED (Solid Amber)—A solid amber port indicator means the
port is partitioned or segmented from the rest of the ports. This may occur
by a management function or by an error condition on the link.
COLLISION (Flashing Amber)—A momentary amber flash occurs when
a collision is detected on the port.
NO LINK (No Light)—If the link test function is not met by the 10BASE-
T device at the opposite end of the UTP segment, this LED will not
illuminate. This may occur if the workstation at the end of the segment is
turned OFF or if the UTP segment is disrupted or damaged.
