Nortel 1800, Installing

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Fast Ethernet port Link/Act LEDs 35
Installing the Metro Ethernet Services Unit 1800
Figure 10 Back panel of the
1800-24T-LX-DC or 1800-24T-DC
After you power the switch up, the LED indicators should respond as described in
Table 3 .
Fast Ethernet port Link/Act LEDs
Each 10/100 Mbps Fast Ethernet (FE) port has two green LEDs. The left LED is
the link-activity LED; the right LED indicates the port speed. The right LED is on
when the port is in 100 Mbps mode. The FE port LED status is described in
Table 4 .
Table 3 LED behavior
LED indicator Behavior
All LEDs Flashes momentarily to represent a system reset.
Power Remains on after the switch is powered up.
Status Flashes while the Metro ESU 1800 loads onboard
software and performs a self-test. The Status LED
remains on if the system is operational.
100M Depending on the transmission speed remains on or
turns off.
Table 4 FE port LED status
Link Activity (left LED) LED status port Link Speed (right LED) LED status
when there is link ON Link Speed is10M OFF
when traffic is in or out LED flashes Link Speed is100M ON
Voltage Range -40 to -60 VDC/ 1.5 A Max
V- V+