Nortel Networks 6300 manual Yel

Network/Status Alarms

Chapter 1 Introduction

The six Network/Status Alarms, labeled RED, YEL, BLU, TEST, SYNC, and LOS, display PRI network activity during system operation. The front panel also has four system status LEDs labeled ATTN, STAT, TRAF, and STATUS that display operational status conditions for the Remote Annex 6300. Table 1-2 describes the alarms.

Technical Support personnel can use this information to diagnose problems.

If you are using an external CSU, some of the Network/Status alarm LEDs may not give true readings. In this case, defer to the status and alarm conditions indicated on the external CSU.

Table 1-2. Network/Status Alarms

Alarm	Description
RED	RED alarm LED is ON during a locally detected carrier failure.
	During the RED alarm condition, a YELLOW alarm is
	transmitted across the telephone network.
YEL	YELLOW alarm LED is ON when receiving a YELLOW alarm
	condition from the telephone network.
BLU	BLUE alarm LED is ON when receiving an unframed, all-ones
	Alarm Indication Signal (AIS) from the network. This condition
	exists upon a loss of originating signal, or when any action is
	taken that would cause a signal disruption.
TEST	RED network TEST LED is ON when the ISDN Network
	Interface is looped back. Loopback tests are activated either
	locally by the user or by the telephone company.
SYNC	GREEN SYNC LED is ON when the PRI interface is properly
	synchronized with the received network signal and is receiving
	proper framing information.

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Remote Annex 6300 Hardware Installation Guide 1-7