alarm hardware is activated by closing the normally open contact. The RED ALARM LED
on the faceplate lights and an alarm message is created in the alarm log and the MMI
terminal.
• Alarm Level 2 (AL2) consists of activity with an error threshold above the AL2 setting.
This is an unsatisfactory condition. In this situation, the external alarm hardware is
activated by closing the normally open contact. The RED ALARM LED on the faceplate
lights, an alarm message is created in the alarm log and the MMI terminal. The Lineside
T1 card enters line processing mode and a yellow alarm message is sent to the CPE/
CSU. The Line processing sends the CS 1000E, CS 1000M, and Meridian 1either all "on-
hook" or all "off-hook" signals depending on the dip switch setting of the card.
When the Set Alarm command is used, a prompt appears to configure the threshold level and
duration period for alarm levels 1 and 2.
The threshold value indicates the number of bit errors detected per second that is necessary
to activate the alarm. The T1 link processes at a rate of approximately 1.5 mb/s. The threshold
value can be set between 3 and 9 and can be different for each alarm level. Any other value
entered causes the software to display a "Parameter Invalid" message. The threshold number
entered represents the respective power of 10 as shown in
Table 80: T1 bit error rate threshold
Note:
The error rate threshold for a level 2 alarm must be greater (a smaller power of 10) than for
a level 1 alarm.
Table 80: T1 bit error rate threshold settings
Alarm threshold bit errors
per second in power of 10
Threshold to set alarm
Allowable duration periods
10
–3
1500/second
1–21 seconds
10
–4
150/second
1–218 seconds
10
–5
15/second
1–2148 seconds
10
–6
1.5/second
1–3600 seconds
10
–7
1.5/10 seconds
10–3600 seconds
10
–8
1.5/100 seconds
100–3600 seconds
10
–9
1.5/1000 seconds
1000–3600 seconds
The duration value is set in seconds and can be set from 1 to 3600 seconds (1 hour). This
duration value indicates how long the alarm lasts. Low bit error rates (10-7 through 10-9) are
restricted to longer durations because it takes more than one second to detect an alarm
condition above 10-6. Higher bit error rates are restricted to shorter durations because the MMI
error counter fills at 65,000 errors.
Man-Machine T1 maintenance interface software
Circuit Card Reference
July 2011 181
Summary of Contents for 1000 Series
Page 1: ...Circuit Card Reference Nortel Communication Server 1000 7 0 NN43001 311 04 04 July 2011 ...
Page 20: ...20 Circuit Card Reference July 2011 ...
Page 30: ...Introduction 30 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 116: ...Option settings 116 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 143: ...Figure 25 CP PIV card front Physical description Circuit Card Reference July 2011 143 ...
Page 148: ...NT4N39AA CP Pentium IV Card 148 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 287: ...Figure 86 Clock Controller Option 3 Operation Circuit Card Reference July 2011 287 ...
Page 302: ...NT5K21 XMFC MFE card 302 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 346: ...NT6D80 MSDL card 346 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 353: ...Figure 96 NTDK16 DLC Functional description Circuit Card Reference July 2011 353 ...
Page 461: ...Figure 147 Paging trunk operation Applications Circuit Card Reference July 2011 461 ...
Page 462: ...NT8D15 E and M Trunk card 462 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 500: ...NTAK09 1 5 Mb DTI PRI card 500 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 512: ...NTAK10 2 0 Mb DTI card 512 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 534: ...NTAK79 2 0 Mb PRI card 534 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 550: ...NTBK22 MISP card 550 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 560: ...NTBK50 2 0 Mb PRI card 560 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 595: ...Figure 165 MGC block diagram Introduction Circuit Card Reference July 2011 595 ...
Page 662: ...NTRB21 DTI PRI DCH TMDI card 662 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 668: ...NTVQ01xx Media Card 668 Circuit Card Reference July 2011 Comments infodev avaya com ...
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