Siemens DataNET Hub (DNH) user manual Yellow Warn LED Blink Codes, Hub Port LEDs, Green Normal LED

System Status LEDs,

Yellow (WARN) LED Blink Codes

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The yellow (WARN) blink codes are shown below. The yellow (WARN) status LED will light any time a link error is present. That is, any time at least one red (FAULT) link LED is lit, the yellow status LED will also be lit (green and red LEDs will be off).

Number of blinks:	Error:
1	RAM failure
2	FLASH checksum error
3	Invalid configuration
4	Reserved
5	Other hardware failure during self-test
6	Duplicate IP address detected
7	Cross-link failure

Hub Port LEDs	The Uplink and Downlink ports each have a status LED. The LED for
	each port can either indicate red (FAULT) or green (NORMAL).
Green (NORMAL) LED	The green LED is on once the link has become established (active). It
	will remain on as long as the link is active (i.e., polls/responses are re-
	ceived within a timeout period). The green LED will blink off (~100mSec)
	for each information-carrying frame sent or received, with a minimum of
	100mSec “on” time between blinks.
	When the hub detects an address loop (the same IP address is being
	used on multiple hubs), the port is disabled and green LED will remain
	off until the user changes the IP addresses and resets the port.
Red (FAULT) LED	On active links, the hub indicates transient errors by blinking the red LED
	briefly (~100mSec). The red LED is on if the link has been active since
	the hub was last powered on or reset but has subsequently become in-
	active. A link will become inactive if the wires are disconnected, shorted,
	or a message is dropped after three retries. If a channel has never been
	active since the DNH was last powered-up or reset, both LEDs will be
	off. This is intended to reduce spurious error indications for channels that
	are completely disconnected.

2000585-001 Data Communications Setup • 63