Section 10 ADVANCED PROBLEM SOLVING
182
is ok.
•
Within this context the symptoms will now give insight as to whether the
problem is with the encoder or decoder.
•
If neither unit can lock to itself then failure of one (or both) communications
path(s) is likely.
Zephyr Audio Level LEDs
To determine if audio is present, and at what level.
•
It is possible for the meter to fail when the relevant section is otherwise working.
Metering is done in the digital domain.
CSU/TA Loopback Modes
(Applies to external CSU/TA’s only.)
Most CSU/TA’s have a “Local Terminal” or “DTE”
loopback mode which serves to “give you your signal back.” Thus, if your send audio
can be received when CSU/TA loopback is engaged, the Zephyr and interconnect cable
are functioning, and the problem is likely either in the telephone network, the CSU/TA,
or the Zephyr at the other end.
Most CSU/TAs also have modes to loop the distant signal back to the sender, as well.
Use similarly to the Zephyr’s loopback modes as indicated above.
Condition: Front Panel Display Problems
If the LCD is dark or unreadable, the special front panel diagnostic and set- up mode
may be useful.
To enter this mode, press the <YES + > and <NO - > buttons simultaneously while
powering- up the Zephyr. All LEDs should illuminate and the LCD displays the famed
“Kevin Icon.” The <SEL> buttons adjust the backlight level, while the <YES+> and <NO-
> buttons control the LCD contrast. The unit must then be switched- off and on again to
resume normal operation.
If this does not work then the Zephyr’s internal ROM settings may have been scrambled.
In this case hold the HELP button depressed for 5 to 10 seconds and release. The default
contrast and brightness values have now been set.
If neither of the above works try the COLD BOOT command.
Condition: No Basic Functionality
Does the Zephyr have power?
In ISDN units, the SYNC LED is illuminated whenever power is applied. Is the switch
on? Is the cord plugged- in? Does the outlet have power? Is the Zephyr fuse blown?
Summary of Contents for Zephyr
Page 13: ...Table of Contents 13 SECTION 1 QUICK RESULTS ...
Page 26: ...Section 2 INTRODUCTION 26 This page intentially left blank ...
Page 27: ...Section 2 INTRODUCTION 27 SECTION 2 INTRODUCTION ...
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Page 39: ...39 SECTION 3 ZEPHYR AT A GLANCE ...
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Page 53: ...Section 4 INSTALLATION BASIC OP 53 SECTION 4 INSTALLATION BASIC OPERATION ...
Page 84: ...Section 4 INSTALLATION BASIC OPERATION 84 ...
Page 85: ...Section 5 ISDN 85 SECTION 5 ISDN ...
Page 105: ...Section 6 NON ISDN NETWORKS 105 SECTION 7 AUDIO CODING ...
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Page 119: ...Section 8 DETAILED MENU REFERENCE 119 SECTION 8 DETAILED MENU REFERENCE ...
Page 157: ...Section 9 REMOTE CONTROL 157 SECTION 9 REMOTE CONTROL ...
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Page 177: ...Section 10 ADVANCED PROBLEM SOLVING 177 SECTION 10 ADVANCED PROBLEM SOLVING ...
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Page 197: ...Section 11 TECHNICAL INFORMATION 197 SECTION 11 DETAILED TECHNICAL INFORMATION ...
Page 219: ...Section 12 SCHEMATICS 219 SECTION 12 SCHEMATICS ...
Page 221: ...Section 13 MANUFACTURER S DATA SHEETS 221 SECTION 13 MANUFACTURER S DATA SHEETS ...
Page 223: ...Section 14 SPECIFICATIONS WARRANTY 223 SECTION 14 SPECIFICATIONS AND WARRANTY ...
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Page 229: ...Section 15 APPENDICES 229 SECTION 15 APPENDICES ...