Cisco Systems 1500 manual LT4

Chapter 1 Product Overview

System Modules

Table 1-8 TDM4E LED Descriptions (continued)

Label	Color	Description
	Solid green	Data is received from a local port. Data rate matches clock
		frequency.
LR1	Blinking green	Local port is enabled.
	Solid yellow	Data is received from a local port. Data rate does not match
		clock frequency and the local clock is unlocked.
	Blinking yellow	Local port is disabled.
LT4	Green	Data is transmitted to a local port.
LT3	Green	Data is transmitted to a local port.
LT2	Green	Data is transmitted to a local port.
LT1	Green	Data is transmitted to a local port.
	Green	Data is transmitted to the remote end of the link, or the
R/T		remote laser is forced on.
	Blinking	Remote laser is forced on while local loop is activated.
	yellow/red
R/T	Flashing green	ALS1 occurred when the green LED flashes every
		10 seconds.
R/T	Yellow	Local loop is activated.
R/R
R/R	Green	Data is received from the remote end of the link. Data rate
		matches the clock frequency. The remote transmitter from
		the remote end of the link and the remote receiver from the
		local end are synchronized
	Yellow	Data is received from the remote end of the link. Data rate
		matches the clock frequency, but the remote transmitter
		from the remote end of the link and the remote receiver
		from the local end are not synchronized.
ERR	Solid red	An error has occurred.
	Blinking red	Card initialization or local loop is activated or the remote
		laser is forced on.
1. ALS = automatic laser shutdown
		Cisco Metro 1500 Series Hardware Installation Guide
78-10588-03			1-37