Troubleshooting General Transmit and Infrastructure for the GTR 8000

Prerequisites:

• Check the status report screen and status panel screen for warnings or failures that may indicate a cause for the problem you are trying to resolve.
• Ensure that wildcard configuration is not causing the GTR 8000 behavior.

Procedure:

1. Determine if the GTR 8000 Tx path to the antenna is operational. Check the GTR 8000 Tx path to the Antenna by clicking Transmitter Test on the CSS Transmitter Metering Screen. You can view the forward and reflected power and VSWR. For ideal responses, see the following:
   • Forward Power should be within 10% of programmed power level.
   • Reflected Power = 0. Typically, a small amount of reflected power is indicated. Reflected power should be less than 4% of the forward power.
   • VSWR is typically slightly greater than 1, which is still acceptable, but should be less than 1.5:1.

   Note Excessive VSWR or reflected power indicates a problem with coax cables or external equipment (such as, circulators, duplexers, combiners, or antennas) connected to the transmit port of the base radio.

   NoteIf a circulator is in the TX path to the antenna, the readings only reflect the state of the GTR 8000 Tx path up to the circulator since the circulator absorbs reflected power. In this case, an external Wattmeter is needed. You can still use the Transmitter Test to key up the GTR 8000 and view the forward and reflected power on the External Wattmeter.
2. Check the Power Amplifier LED.

   If…	Then…
   Yes	Check whether the GTR 8000 receives the correct voice payload to transmit: For analog wireline, check with an oscilloscope that voice is present on the wire. For digital wireline, check with a network analyzer that voice frames are transmitted.
   No	Determine if the voice is infrastructure or repeat sourced. Continue to the next step.

3. Determine if the voice is infrastructure or repeat sourced.

   If…	Then…
   Infrastructure:	Determine if the link is digital or analog. Continue to the next step.
   Repeat:	Check with the CSS Status Panel Screen that the GTR 8000 receives voice data with the correct Rx Qualifiers (PL, DPL or NAC). Check whether the GTR 8000 is configured for repeat. Check whether there is no other inbound activity (for example, infrastructure) that could preempt repeat.

4. Determine if the link is digital or analog.

   If…	Then…
   Analog	Depending on configuration, ensure with an oscilloscope that key-up trigger is present either as wireline tone or as a wildcard external key-up input.
   Digital	Check with the CSS Status Panel Screen whether the Infrastructure Link is operational. Continue to the next step.

5. Determine if the Infrastructure Link is operational.

   If…	Then…
   Failed	Determine if the connection is V.24 or Ethernet. Continue to the next step.
   Operational	Ensure with V.24 or Ethernet packet analyzer that ICW and voice frames reaches the GTR 8000 Base Radio.

6. Determine if the connection is V.24 or Ethernet.

   If…	Then…
   V.24	Check the V.24 transmit clock setting. Check the link configuration of the device on the other side of the connection and ensure that the V.24 cable is not spoiled.
   Ethernet	Determine if you can ping, Telnet, or connect CSS over the Ethernet to the GTR 8000. Continue to the next step.

7. Determine if you can ping, Telnet or connect CSS over the Ethernet to the GTR 8000.

   If…	Then…
   Yes	Check the configuration, using Provisioning Manager User Guide or Configuration Manager.
   No	Check the network configuration: IP, gateway settings, switch and router configurations, physical connection

8. If Invalid launch time is reported, check following:
   • Link delay setting
   • 1PPS signal source
9. If many data packets are lost, check the following:
   • Check the signal level at the receiver site with an analyzer.
   • If the GTR 8000 is repeating data, verify that Packet Data Mode is configured to repeated on the receiving subscriber.