Philips DBS-EX23-530 manual Alarm Descriptions, Programming Reference Alarm Settings

Programming Reference Alarm Settings

Alarm Settings

Alarm Descriptions

ISDN alarms can be reported through LEDs on the ISDN card, an alarm relay on the ISDN MDF card, or FF keys on a key phone. Table 4-1summarizes the types of alarms that can occur with the ISDN. Table 4-2summarizes alarm settings for all three types of alarms.

Table 4-1. ISDN alarm definitions

Alarm	Description	Notification
Red	The DBS activates a red alarm when a loss of sig-	FF key (after the counter is exceeded)
	nal or out-of-frame condition lasts for more than	CFA LED on the ISDN card
	2.5 seconds.
		Alarm relay on the ISDN MDF card
Yellow	A yellow alarm is sent to the distant end of the	FF key (after the counter is exceeded)
	ISDN link to indicate that a red alarm has occurred.	YEL LED on the ISDN card
	If a red alarm occurs at the CO, the CO sends a yel-
		Alarm relay on the ISDN MDF card
	low alarm to the DBS. If a red alarm occurs at the
	DBS, the DBS sends a yellow alarm to the CO.
Frame	The DBS activates an OOF alarm when more than	FF key (after the counter is exceeded)
Loss	one out of four consecutive framing bits is in error.	OOF LED on the ISDN card
		CFA LED on the ISDN card
		Alarm relay on the ISDN MDF card
Slip	The DBS activates a slip alarm when a data bit is	FF key (after the counter is exceeded)
	lost due to a frame misalignment. Frame misalign-	OOF LED on the ISDN card
	ment is caused by timing errors.
		SLIP LED on the ISDN card (See
		Note.)
Sync	The DBS activates a sync loss alarm due to timing	FF key (after the counter is exceeded)
Loss	errors. Timing errors result in frame misalignment.	SLIP LED on the ISDN card
		CFA LED on the ISDN card
AIS	The CO sends an AIS (Alarm Indication Signal) to	AIS LED on the ISDN card
	indicate an “out-of-service” condition on the net-	OOF LED on the ISDN card
	work side. The AIS, also referred to as the “keep
		CFA LED on the ISDN card
	alive signal,” is comprised of all 1s and is
		Alarm relay on the ISDN card
	unframed. The DBS sends an AIS through the
	“AIS Signal Transmission” code (page 4-37).

Revised April 2000 DBS-EX23-530 4-17