Cisco Systems 1500 manual Clock Recovery Front Panel LEDs

Chapter 1 Product Overview

System Modules

Only signals with the designated data rate can be transmitted within a guaranteed optical budget.

Clock Recovery Front Panel LEDs

The WCM LEDs provide information about its operating status. Table 1-4 describes the LEDs.

Table 1-4 Clock Recovery WCM LED Descriptions

Label	Color1	Description
On/Err	Green	Power is on. No software or hardware errors are detected.
	Red	A hardware or software error was detected or the
		initialization is in progress (during system startup only).
	Red	WCM is in manual setting mode (not shown in case of
	blinking	error).
Loop	Orange	A remote and/or a local loop is established.
L/R	Green	Data is received from a local port and the data rate matches
		the clock frequency.
	Yellow	Data is received from a local port but the data rate does not
		match the clock recovery frequency.
L/T	Green	Data is transmitted to a local port.
R/R	Green	Data is received from the remote end of the link.
R/T	Green	Data is transmitted to the remote end of the link.
	Green	WCM is in ALS mode; LED blinks once every 10 seconds.
	blinking
	Off	Data stream is interrupted because the clock frequency
		does not match the current data rate.

1. Any other state than the ones listed indicates a possible failure in the local system.

Locally received optical data enters the local receiver and is electrically transferred to the remote transmitter using clock-recovery. The clock recovery locks onto the edges of the data signal and restores the signal to the chosen data transmission frequency. The remote transmitter transmits the data in optical form at a certain ITU wavelength to the MUX.

	Cisco Metro 1500 Series Hardware Installation Guide
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