[ANSS-netops] cell modems and first of the month

[Antonio Sanchez]

Greetings to all,  

Thought it was useful to add some more details to the community 

Based on REF TEK's experience running cellphones, Radios and several
types of telemetry stations as well as all the input we get from
customers, some modifications were done to the way Ethernet behaves in
the RT130 recorder. The observations made have led an effort to
enhance/modify the 130-01 standard firmware version starting with the
3.2.2 release (Feb. 2010)   These enhancements are described below:


1) Addition to Cycle Ethernet Power Output 


The Ethernet power output line (pin M - Net Connector) will now be
powered off for 10 seconds if the RTP connection is down for
approximately 80 minutes. This can be used to power cycle any equipment
powered by the 130 via the NET connector. The 10 seconds power off will
occur every 80 minutes until the RTP connection is re-established. We
have created a cable Part Number with a Relay for doing so,  it is
130-8019-GPRS.


2) Addition to the RTP Behavior when Telemetry Connection is Lost 


When the telemetry connection is lost, the DAS sends out RTPD Host
Server Discoveries. After 5 minutes of sending these with no reply, the
DAS will stop sending them for 2 minutes. This process is repeated until
there is a reply from the RTPD host Server address.  In addition the DAS
will display the message "RTP SLEEPING" on the LCD during the 2 minutes
that Server Discoveries are suspended.  One of the reasons to do the 2
Minutes "sleeping mode" was to allow radios with OpenVpn capability to
negotiate its link before the station gets mapped in the MAP file.  It
also lets the radio buffers empty in case they were flooded.


3) Addition of an Software Watchdog 


A software watchdog has been implemented to monitor code execution.


4)  Addition of an Adaptive Telemetry Re-transmit Algorithm 


The RTP re-transmit interval has been modified to adjust the re-transmit
interval based on the round trip time of the previously transmitted
packets. The maximum RTP re-transmit interval is 10 seconds.


5) Modification to Interleave Telemetry Data During Disk Writes 


Telemetry data is now periodically sent during the 130 CF card write
operations to reduce the latency caused by suspending telemetry data
transmission during disk dumps.


6)  Correction to the Ram Percent Full Checking and Forced Toss 


The checks performed on ram usage did not change the telemetry data to
the toss mode (if selected) when ram filled to 97% even if the toss
delay had not been satisfied.


REF TEK encourages 130 telemetry users to upgrade to the latest
firmware, 3_2_2.  It can be downloaded from http://support.reftek.com



Antonio

Antonio Sanchez
REFTEK Customer Support Manager
Refraction Technology Inc
1600 10th Street Plano TX 75074 USA
Ph 214 440-1265
Ph 214 440-1271 (direct)
http://www.reftek.com
ftp://ftp.reftek.com
" Want to become an expert with REF TEK equipment?  Attend our REF TEK  
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