1. Yellow ID labels:
AP = Access Point radio, for the studio;
DG = Dual Gateway, for the remote / transmitter site.
The radios should still work with the AP at the remote site and the DG at the studio.
2. Lanlinks won't Associate via radio?
a) Network Name must be the same in both radios, case sensitive. [Main Menu > Network Configuration Menu]
b) IP addresses must be in the same subnet range, for example: AP radio 192.168.1.101, DG radio 192.168.1.102, computer 192.168.1.10. [Main Menu > Network Configuration Menu > IP Address Configuration Menu]
c) Encryption must be the same in both radios, either ENABLED with the same Encryption Phrase or DISABLED. Encryption Phrase cannot be entered via web pages - only via direct connection to COM1 command port or using Telnet. [Main Menu > Security Configuration Menu]
d) If there's an STL filter, it must be between the Lanlink STL port and the receiver, NOT between the antenna and the Lanlink.
e) If there’s an STL transmitter amplifier, it must be between the transmitter and the Lanlink STL port, NOT between the Lanlink and the antenna. Maximum amplifier output 10 Watts (+40dBm) into the Lanlink STL port.
f) Are both radios powered-up and connected to their antennas? Check the RF coaxial cabling according to web page http://www.moseleysb.com/mb/manuals/Lanlink_information.xls
3. No COM2 data transmission?
a) The AP radio must direct data to the DG radio IP address and the DG radio must direct data to the AP radio IP address. [Main Menu > Serial Gateway Configuration Wizard > COM2]
b) Verify baud rate (factory default is 9600).
c) Verify data format (factory default is 8N1).
d) Verify flow control setting (factory default is DISABLED).
e) Verify COM2 LED lights when RS-232 data is being sent or received via that radio's DB-9 port or the distant radio's DB-9 port; null modem cables with DB-9F connectors may be required.
f) If using Burk equipment and cable assemblies with DB-9F to 2 BNC connectors, try reversing "IN"/"OUT", "Tx"/"Rx" data connections; verify the Burk baud rate (minimum 1200 baud to use the Lanlink).
g) If either radio is power-cycled while the COM2 port is receiving continuous data, some radios will not restore data flow until COM2 is unplugged then plugged back in. Fixes are available for this known bug – please contact the Moseley factory for assistance.
4. Slow data transmission via radio?
a) Is the Ethernet LAN port trying to carry traffic from office printing, e-mail, Internet downloads, etc? Lanlink capacity is much less than Ethernet cable, so it should be connected to a quiet Engineering LAN, not a busy office network. A programmable switch is recommended to keep unnecessary traffic off the Lanlink.
b) Is there interference from other radio transmitters nearby? Use a spectrum analyzer to measure BOTH AP and DG antennas with the Lanlink radios powered-down - measure on the Lanlink diplexer port and call the factory for assistance. The STL radios can stay on-the-air while performing these tests.
c) Is RSSI weaker than -79dBm? <See 5c below>
d) The Data Rate should be set to one of the two fixed rates, NOT Auto. [DG radio Main Menu -> Radio Configuration Menu, see 5c below]
5. LED indicators?
a) Flashing Power LED with no Link LED indicates no Network Name. [Main Menu > Network Configuration Menu]
b) DG radio Power LED lit but Link LED not lit after about a minute indicates no Association with the AP radio. See Q2 above.
c) DG radio Power LED flashing with Link LED lit indicates an alarm. [Starting Information -> Status Alarmed]
DG radio Received Signal Strength Indication RSSI:
Stronger than -50dBm needs attenuation or transmit powers reducing to +20dBm minimum;
-50 to -70dBm is best for either fixed data rate;
-71 to -80dBm is acceptable at the lower fixed data rate [DG Main Menu -> Radio Configuration Menu];
-81 to -89dBm is marginal;
-90 to -99dBm is very marginal and will cause an RSSI alarm (flashing Power LED);
-100dBm or weaker causes link loss.
Transmit power can be set between +20dBm and +30dBm, subject to +36dBm EIRP maximum. [Main Menu > Radio Configuration Menu]
AP radios don't display RSSI, since they could have several DG radios associated in a network, each with different signal strength.
d) COM1 LED should light while transmitting or receiving command information.
e) COM2 LED - see 3e above.
6. Cannot connect via COM1 command port?
a) Needs RS-232 straight cable, DB-9F to plug into COM1; set terminal program to 19.2k baud, 8N1, flow control OFF/Disabled/None.
b) If COM1 has been enabled for data transmission, use Ethernet LAN connection to DISABLE COM1 and restore command access. [Main Menu > Serial Gateway Configuration > COM1]
c) Alternatively, plug into COM1 per 6a. above, power-cycle the radio, then type +++ when prompted after the boot-up sequence to restore COM1 command access. [+++ is “Shift+=”, not the + sign next to the number pad]
7. Cannot communicate via LAN port, no LAN LED?
a) Directly from the computer to the LAN port needs an Ethernet crossover cable.
b) From an Ethernet hub, router or switch needs Ethernet straight cables.
c) Try another, known-good cable (RJ-45 modular plugs with 8 conductors).
d) Is the computer in the same IP address range? See Q2b above.
8. Performed a "Reset to Factory Defaults"?
a) Radio will need to be reconfigured with IP addresses, Network Name, and perhaps other settings. It’s recommended to also perform a Reset to Factory Defaults on the other radio of the pair, followed by the similar reconfiguration so they match.
b) Return Authorization number may be needed, to send the unit for reconfiguration – please call the factory for assistance.
9. What's the best Lanlink configuration for sending audio via Ethernet/IP?
From the DG Main Menu got to Performance information: RSSI must be -50 to -75dBm or your audio will likely suffer dropouts. Follow the suggestions below or contact Moseley for factory assistance to optimize Lanlink operation at your location.
a) Change the Network Name in both radios from "Moseley" to something else. This will establish different hopping patterns for minimal interference from any other Lanlink system in the area that still has the factory default Network Name "Moseley".
b) Go into the Radio Configuration Menu of both Lanlink radios and ensure the Transmit Power is +30dBm.
c) Check the antennas at all sites for RF energy in the frequency range 895-935MHz. This can be done using a spectrum analyzer or by putting the Lanlink radios themselves into a Test Mode (see Q10 below). A common interference problem is high-powered paging transmitters 929-932MHz which overpower the Lanlink antenna input 902-928MHz; Moseley has a filter available to reduce the problems of such interference.
d) In the DG Radio Configuration Menu, do not use the AUTO Data Rate selection.
d1) Instead of AUTO, try locking the DG radios onto the lower data rate (256 or HS 512kbps); this may seem counterintuitive but these transmissions can be more robust than those at the higher data rate.
d2) Instead of AUTO, try locking the DG radios onto the higher data rate (512 or HS 1024kbps); this may help data throughput for HD radio in conjunction with some of these other suggestions.
e1) Try Enabling Data Compression in the AP radio at the lower data rate; try Disabling Data Compression again, to see if it makes any difference?
e2) Try Enabling Data Compression in the AP radio at the higher data rate; try Disabling Data Compression again, to see if it makes any difference?
f) In the Security Configuration menu, set Encryption to Disabled. In the DG Radio Configuration Menu, set the Fragmentation Threshold to 540 bytes. In the AP Radio Configuration Menu, set the Dwell Time to 16.4ms or 8.2ms and the Beacon Period to Slow. These settings optimize HD radio transmissions.
g) Try reversing the functions of the DG radio (change it to an AP at the remote site) and the AP radio (change it to a DG at the studio). The AP and DG radios transmit data packets slightly differently, which can sometimes work to your advantage.
h) If possible, change the HD radio to TCP/IP packets (an inherently more reliable transmission protocol) rather than UDP packets.
10. How do I test for interference if I don't have a spectrum analyzer?
a) You must be able to log onto the radio directly (not over-the-air) via COM1 or Telnet. STL operation can continue unaffected by this test.
b) From the Main Menu, go to Maintenance Tools -> Radio Test -> A Test Mode On.
c) The radio will ask you if you are sure you want to bring down the current network, meaning only the Association between the two Lanlink radios: press Y for Yes.
d) The Radio Test Menu should display TxKey Disabled and other parameters, updating every second. Note the Frequency 915MHz and RSSI -dBm.
e) Press B, type in a new Frequency, then press Enter; note the new Frequency MHz and RSSI -dBm.
f) Record RSSI -dBm at several frequencies from 895-935MHz; ideally the RSSI would be -100dBm or weaker (more negative) at all frequencies in this range.
g) In the real world, the radio will detect energy from the antenna at some frequencies, for example 915MHz -95dBm should not be a problem. 920MHz -75dBm could cause slow data transmission; 930MHz -45dBm would be a major problem; contact Moseley for assistance.
h) To end the Radio Test mode, remove power from just the Lanlink radio, wait 5 seconds then restore power. Normal Lanlink operation should return in less than a minute.
Question not answered? Call Moseley Technical Support 805-968-9621 x242. |
MS Excel Spreadsheet for coax connections and Channel to Frequency reference
