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6 • DAX
Model 3120 RAS Administrators’ Reference Guide
48
Introduction
Introduction
The digital cross-connect (DAX) link allows configuration of the access servers’ digital cross-connect that man-
ages the time slots and clocking between the WAN ports.
The access server uses a single clock source for all WAN ports. Therefore, to avoid data loss caused by variations
in network timing, each access server should terminate WAN connections from a single timing provider. WAN
connections from multiple timing providers can be terminated in the access server if all the providers source
their timing from the same stratum clock or if the access server provides the network clock.
Click on
DAX
under the
Configuration Menu
to display the
DAX
main window (see figure 20).
Figure 20. DAX main window
Configuring the DAX
There are three variables to select when configuring the DAX circuit:
•
Circuit Type—Defines the overall clocking scheme for the entire access server (refer to “Circuit Type (dax-
ClockMode)”
•
Main Reference—Determines which WAN link supplies the clock for the system (refer to “Main Reference
(daxClockMainRef )” on page 49)
•
Fallback Reference—Enables the configuration of a back-up clock reference should the Main Reference fail
(refer to “Fallback Reference (daxClockFallbackRef )” on page 49)
Circuit Type (daxClockMode)
Defines the overall clocking scheme for the entire access server. For each circuit a selection must be made as to
the overall clocking scheme of the entire system. If your system has only one circuit displayed, then that circuit
must be set to Master.
The following settings are available:
•
master(1)—The master device is responsible for providing the master system clock in synchronization with
one of its references. If your access server has only one circuit, then this setting must be Master.
•
secondary(2)—The secondary circuit provides the master system clock if the master circuit fails.
•
slave(3)—Slave devices provide the system clock references for use by the master or secondary.
Summary of Contents for 3120
Page 8: ...Contents Model 3120 RAS Administrators Reference Guide 8...
Page 12: ...About this guide Model 3120 RAS Administrators Reference Guide 12...
Page 134: ...8 Dial Out Model 3120 RAS Administrators Reference Guide 134 An example section of dialout...
Page 140: ...9 Callback Access Server Administrators Reference Guide 140 Dialout...
Page 176: ...13 Filter IP Model 3120 RAS Administrators Reference Guide 176 An example of using a filter...
Page 226: ...17 MFR Version 2 Model 3120 RAS Administrators Reference Guide 226 MFR Version 2 Modify...
Page 238: ...19 SNMP Model 3120 RAS Administrators Reference Guide 238 Out...
Page 304: ...25 License Model 3120 RAS Administrators Reference Guide 304 End User License Agreement...
Page 309: ...309 Appendix B MIB trees Chapter contents Model 2960 MIB Tree Structure 310...