Studio-Transmitter Links for DTV, Digital Multiplexers, and NLOS COFDM ENG Links for Remote and Fixed Television Broadcast  Applications
Spectrum-Scalable Digital Radios with user-selectable data rates from 64 kbps to 34 Mbps for Wireless Data Networking Applications
Turnkey wireless system solutions for Broadcast, Data, Telecom, and SCADA applications for Oil and Gas Production or Public Utilities
   

References

   
 

Starlink SL9003T1

Frequently Asked Questions

T1 / E1 Digital Transmission System

 

LANLINK 900

1. Why are there audio glitches or dropouts?

 

  1. A clocking conflict (two clocks on the T1 line). The studio Moseley should be the master Clock for the system; verify that the T1 line has no external clock connected. Use a local loopback test (see B below) to verify stable operation within the Moseley SL9003T1.
  2. Too much cable (more than 100 feet) between the T1 line and the Moseley SL9003T1; contact the Moseley factory for advice.
  3. Storms in the area can affect T1 lines, even if all the equipment is working normally. Use a local loopback test (see 2 below) to verify stable operation within the Moseley SL9003T1. If operation via the T1 line comes back to normal after the storm leaves the area, the problem was probably in the T1 line.

2. How do I use a T1 local loopback connector to test the Moseley?

 

  1. Unplug the T1 line; plug in the T1 local loopback connector (see C below) and watch for MUX, Encoder and Decoder LEDs all green and steady, except for one steady orange LED on the T1 Port 4 (this is normal) and slow flashing green Decoder LED (if the Moseley unit has no Encoder).
  2. If the Moseley unit has both Encoder and Decoder, apply audio input and check for good audio output.
  3. If the Moseley SL9003T1 operates normally talking to itself in loopback mode, the problem is most likely in the T1 line.

3.  How do I make a T1 local loopback connector?

  1. Use an 8-conductor RJ-45 plug
  2. Connect Pin 1 -- Pin 4
  3. Connect Pin 2 -- Pin 5
  4. Leave all other pins disconnected.
  5. It would also be OK to use an RJ-45 loopback jack on the end of a CAT-5 cable.

4. How do I test the T1 line?

 

  1. Plug a loopback (see 3 above) into the remote T1 jack (sometimes this can be achieved by unplugging the cable from the T1 jack). Plug the Moseley unit into the T1 line and watch for MUX, Encoder and Decoder LEDs all green and steady, except for one steady orange LED on the T1 Port 4 (this is normal) and slow flashing green Decoder LED (if there is no Encoder).
  2. If the Moseley unit has both Encoder and Decoder, apply audio input and check for good audio output.
  3. This test is best performed from the studio out to the remote site and back. It may be possible to run it from the remote site, via the return path to a studio loopback and back out to the remote site.

 


Question not answered? Call Moseley Technical Support 805-968-9621 x242.

 
 
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