Cabletron Systems STS16-20D, STS16-20R manual Lists the stack-link LEDs and their meanings

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Table 2 lists the stack-link LEDs and their meanings:

LED	State	Meaning
TX	On or	Data is being transmitted to the stack link.
	blinking
RX	On or	Data is being received from the stack link.
	blinking
ATTACH	On	A connection has been established to the stack.

Table 2. Stack-link LEDs and Their Meanings

Table 3 lists the port LEDs and their meanings:

LED	State	Meaning
INS	On	The Token Ring port is inserted into the ring.
(left LED of
	Off	The Token Ring port is not inserted into the ring
port)
	Blinking	The Token Ring port is disabled.
ACT	On or	Data is being transmitted to or received from the
(right LED of	blinking	port.
port)

Table 3. Port LEDs and Their Meanings

SmartStack STS16-20D/STS16-20R Token Ring Switches Installation and User Guide Introduction