Section 10 ADVANCED PROBLEM SOLVING
190
With External CSU/TAs
Is the CSU/terminal adapter connected and configured properly?
The SYNC LED near the SEND label on the front panel indicates that a clock is present
at the V.35/X.21 digital port #1 and at the correct frequency. Since this clock is
generated by the CSU/TA, it is the best indication that the CSU/TA is connected and
has basic functionality. If this LED is not lit:
•
Check the cable. Is it properly seated into all connectors? Is it in good condition? All
pins straight and in good order (Check for loose pins)?
•
Do the CSU/TA bitrates and the Zephyr’s match? Both must be set to either 56 or
64kbps. On the Zephyr, the bitrate setting is accessed by pressing the UTIL button.
•
Is the CSU/TA working? Does it have power? Does it’s LCD show normal text? What
do the LED status indicators show? Does it respond when a button is pushed? Is it
properly configured for the line it is connected to? Note that some CSUs will not
provide clock until dialed up. The adapter manual should be consulted for
information about these matters, as adapters are too varied to offer detailed advice
here!
•
Sometimes handshake timing can cause problems. If so, you should “force on” or
set to “ignore” handshaking options (CTS, RTS, CD, DTR, and DSR) on the CSU/TA.
•
Do you have the proper cable? STEREO and DUAL/MONO operation require that a
two- headed “Y” cable be used to connect the Zephyr to two CSU/TA ports.
Does the CSU/TA’s loopback isolate the problem?
Most CSU/TA’s have a “Local Terminal” or “DTE” loopback mode. Place it in this mode.
(Read its manual to determine how.)
This CSU/TA loopback mode serves to “give you your signal back.” Thus, if your send
audio can be received when CSU/TA loopback is engaged (with Xmt and Rcv set to be
compatible), the Zephyr is functioning, and the problem is likely either in the telephone
network or the Zephyr at the other end.
Most CSU/TAs can also loop the distant signal back to the sender, as well.
ISDN Cause Phrases/Values
When there is an ISDN problem in the network, a phrase appears on the Zephyr’s LCD
(or using the built- in protocol analyzer) which communicates information about the
cause of the trouble. These “Cause Values” are numbers generated by the network,
which the Zephyr translates to the associated phrases. When possible, we use those
suggested by the Bellcore standard.
Note that in some cases there may be more than one meaning. This can frequently be
evaluated by whether the message has been received by the calling party or the called
party.
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 ...
Page 38: ...Section 2 INTRODUCTION 38 This page intentionally left blank ...
Page 39: ...39 SECTION 3 ZEPHYR AT A GLANCE ...
Page 52: ...Section 4 INSTALLATION BASIC OPERATION 52 This page intentionally left blank ...
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 ...
Page 118: ...Section 7 AUDIO CODING PRINCIPLES 118 This page intentionally left blank ...
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 ...