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IXIA AFD2 Manual
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IXIA AFD2 Manual

Auxiliary function device with integrated irig-b. time receiver.
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15
Ixia Platform Reference Manual Manual, Release 6.30
Ixia IRIG-B Auxiliary
Chapter 15:
Function Device
(AFD2)
The IXIA Auxiliary Function Device 2 (AFD2) provides the means for accurate
worldwide timing using Inter-Range Instrumentation Group (IRIG-B)
technology. The ADF2 decodes the GPS satellites and time information and
sends out a pulse to the Optixia chassis. The IXIA /AFD2 is shown in
1.
Figure 15-1. Ixia AFD2
The IXIA AFD2 with integrated IRIG-B is designed to provide 12.5 MHz GPS
clock with a programmable 80 ns sync pulse to the Optixia chassis.
The Ixia AFD2 IRIG-B receiver is controlled by an Ixia chassis through a USB
port. Chassis timing is provided by connecting the Sync Out of the AFD2 to the
Sync In of the chassis. This configuration then enables the chassis to operate as a
subordinate in a virtual chassis chain, with the Ixia AFD2 as the master.
Figure 15-2
on page 15-2 shows the AFD2 in operation with other chassis in a
local chassis chain. Multiple local chassis chains can be collected through IRIG-
B into a virtual chassis chain.
Figure 15-
15-1

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Summary of Contents for IXIA AFD2

  • Page 1 The Ixia AFD2 IRIG-B receiver is controlled by an Ixia chassis through a USB port. Chassis timing is provided by connecting the Sync Out of the AFD2 to the Sync In of the chassis. This configuration then enables the chassis to operate as a subordinate in a virtual chassis chain, with the Ixia AFD2 as the master.
  • Page 2 B time lock and then synchronizing the internal clock to the IRIG-B 1PPS pulse. The AFD2 does not enter the ‘Lock’ state until the VCXO lock condition is met. In the unlocked state, the chassis in the unlocked chain are not accurately time- synchronized to the rest of the chain.
  • Page 3 To reset time stamps for a IRIG-B-connected system, the reset operation needs to be executed for the chassis chain, and not for the individual chassis. Figure 15-3. Chassis Properties AFD2 - Time Source If set to Synchronous time source, a chassis connected to IRIG-B does not operate properly unless the sync cable is disconnected.
  • Page 4 The AFD2 Kit: The AFD2 kit comes with cables and items required to install and connect the AFD2 in a lab. The AFD2 kit does not include the IRIG receiver and antenna for permanent installation at a particular site. The kit contains these items: •...
  • Page 5 Changing Time Source Connect the 1PPS and IRIG-B outputs from the IRIG-B receiver to the AFD2. Connect the sync and USB cables between AFD2 and the Ixia chassis. On the front panel of the AFD2, • the Pwr OK indicator lights solid, •...
  • Page 6 15-3), then one of the following Ready’ conditions needs to be corrected. 1PPS signal is not connected: check cabling between AFD2 and the IRIG-B receiver. IRIG-B Mode B000 has been selected, but the IRIG-B receiver is sending B120 signal (or vice versa): change the selection in the Time Sources tab of...
  • Page 7 15-7. Figure 15-9. Worldwide Deployment of Synchronized Chassis The ports on all of the chassis may be shared by one or more Ixia software users located likewise anywhere in the world. Where IRIG-B and CDMA sources are used, all of the sources must have good quality time values in order for the trigger to be transmitted.
  • Page 8 GPS in-built 150 nanoseconds Stratum 1 from GMT Calculating Latency Use the following calculation for latency accuracy for AFD2 ( IRIG-B ) setups. Accuracy for AFD2 Latency A to B = Lab (IRIG-B) Latency B to A = Lba Transmit path A to B = T1...

  • Page 9: Front Panel Leds

    Ixia IRIG-B Auxiliary Function Device (AFD2) Front Panel LEDs Front Panel LEDs The AFD2 has the following front panel LEDs: Table 15-3. AFD2 LEDs Label Color Description Green Indicates that the connection is enabled, and glows solid with USB activity.
  • Page 10 Ixia IRIG-B Auxiliary Function Device (AFD2) IXIA AFD2 Specifications Table 15-4. Ixia AFD2 Specifications IRIG-B Functionality Bit rate is 100 pps and frame rate is 1fps for both code formats. 1pps pulse provides the precise time refrence. IRIGB000 DC level shift, pulse width coded with BCD,...