System-level Troubleshooting
405
Alarm Descriptions
Red Alarm
■
Carrier Fail Alarm
(Red CFA) — A state that exists at a downstream
terminal device, based upon the terminal device detecting an
incoming LOS or LOF.
Blue Alarms
■
AIS, Keep-alive/Blue
— A
signal
that is transmitted instead of the
normal signal to maintain transmission continuity and to indicate to
the receiving equipment that there is a transmission interruption either
at the equipment that is generating the AIS signal or upstream of that
equipment. The all ones signal is generated:
■
To maintain transmission continuity
■
To notify downstream equipment of a transmission fault
■
To indicate to downstream equipment that a DS1 framed signal is
not being generated
The transmission fault may be located at the equipment that is
generating the alarm signal, or it may be located upstream of that
equipment.
■
AIS CFA
(also known as Blue CFA) — A
state
that exists at the
downstream equipment and indicates that it has detected an AIS
signal from the upstream equipment.
Yellow Alarms
■
RAI
(also known as Yellow Alarm Signal) — A
signal
transmitted in
the outgoing direction when a terminal determines that it has lost the
incoming signal. The terminal equipment generates the Yellow Alarm
Signal for a minimum of 1 second using one of these methods:
■
If you are using Super Frame (SF), the terminal equipment
generates the Yellow Alarm Signal by setting the second bit in all
channels of the Super Frame to 0 (zero).
■
If you are using Extended Super Frame (ESF), the terminal
equipment generates the Yellow Alarm Signal by sending an
alternating pattern of 8 ones followed by 8 zeros on the Facilities
Data Link (FDL).
■
Yellow CFA
— A
state
that is activated at the terminal equipment
when the terminal equipment detects a Yellow Alarm Signal. The
Yellow Alarm Signal comes from the equipment at the other end
when the far end equipment enters a Red CFA state. See Red Alarm,
earlier in this section.
Summary of Contents for NBX 100
Page 14: ......
Page 18: ...18 ABOUT THIS GUIDE ...
Page 26: ...26 CHAPTER 1 INTRODUCTION ...
Page 138: ...138 CHAPTER 2 DIAL PLAN ...
Page 322: ...322 CHAPTER 3 DEVICE CONFIGURATION ...
Page 328: ...328 CHAPTER 4 USER CONFIGURATION ...
Page 412: ...412 CHAPTER 10 TROUBLESHOOTING ...
Page 458: ...458 APPENDIX B ISDN COMPLETION CAUSE CODES ...
Page 480: ...480 GLOSSARY ...
Page 492: ...492 INDEX ...