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Operating the AN/DC and ANH-8/DC
312410-A Rev 00
4-7
Back-Panel LEDs
Figure 4-3 illustrates the back-panel LEDs for the ISDN and Second Ethernet
options. These LEDs are visible after installing either an ISDN BR Interface or
Second Ethernet Interface upgrade module.
Figure 4-3. ANH-8/DC Back-Panel LEDs
AUI Part
(Partition)
Amber Lights to indicate that the AUI port has been
partitioned from the repeater due to a disruption in
transmission. Autopartitioning occurs after an
excessive number of consecutive collisions or an
excessively long single-collision signal.
DCD1 (Data Carrier
Detect 1)
Green Lights to indicate that the first synchronous port
(COM1) is active.
DCD2 (Data Carrier
Detect 2)
Green Lights to indicate that the second synchronous port
(COM2) is active.
<LAN> Green Lights after each data transmission to indicate data
present in the repeater. The signal is longer than the
duration of data, allowing the eye to perceive the
occurrence of very short transmissions. The LED may
appear to flicker during numerous transmissions.
Col
(Collision)
Amber Lights to indicate a collision in the AUI repeater.
Table 4-3. ANH-8/DC Front-Panel LEDs
(continued)
LED Label Color Meaning
COM 1
COM 2COM 3/Expansion
ISDN-BRI
3 LEDs1 LED
UTP-2
TX
RX
COL
AN0059B
RTN -VDC
-48VDC
-60VDC
1.5A