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Joined: Dec 2006
Posts: 108
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Joined: Dec 2006
Posts: 108 |
Just replaced a point to point Verizon T-1 with Rad Mitop SFP modules connected via Leased single mode Fiber. It connects 2 Adtran Atlas 550 units that handle audio for our radio system.
As I never had access to the old T-1's smartjack data I am wondering if the stats below are normal on a T-1 My only real concern is discarded packets. The system is working fine and the Adtran Atlas is not reporting any problems
Below is a 12 hour stat report from the Rad SFP module, anything jump out as bad??
Monitoring>Physical Layer>Connection Statistics
Good packets received 81944897
Good packets transmitted 81944807
Missing packets 0
Misordered packets 0
Discarded packets 168
buffer Current level [ms] 2
Jitter buffer Max level [ms] 3
Jitter buffer Min level [ms] 1
Dpll Overflow 0
CDC detected 0
Virtual JB un/overrun 0
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Joined: May 2007
Posts: 5,059 Likes: 6
Moderator-1A2, Cabling
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Moderator-1A2, Cabling
Joined: May 2007
Posts: 5,059 Likes: 6 |
You've got an uptime rate of 0.9999989. Essentially 6 "9"s.
We always built out circuits to 5 "9"s and people thought we were excessive.
5 "9"s is about 5 minutes out of service in a year (total - not necessarily in a row!).
6 "9"s is about 30 seconds out of service in a year (total OOS time).
Why look for trouble? Everything's working well.
Sam
PS. It's late and I'm on my 3rd Jack Daniels. My math may be a little fuzzy, so correct me if I'm wrong, but I don't think so.....
Last edited by Silversam; 02/19/14 01:02 AM.
"Where are we going and why are we in this hand basket?"
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Joined: Feb 2006
Posts: 1,716
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Look at it this way. Out of 164 million packets you had a whopping .000102439% that were discarded. I wish all my hi cap circuits were that clean. Discarded packets are usually equipment housekeeping anomalies that have nothing to do with quality.
Rcaman
Americom, Inc.
Where The Art And Science Of Communications Meet
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Joined: Oct 2010
Posts: 250
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Data communications has built in safeguards. One is the ability to discard any data packets that are seen as corrupted by the network. In your case it threw away 168. However there are no missing or packets received out of order. Why? Because at one layer of the protocol stack it told the transmitting end to retransmitt those 168 packets. Make sure to interpret all the PM data and also trust your equipment to signal an issue.
I salute you for using PM data as a troubleshooting tool!
Forty six years and still fascinated with Telecommunications!
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Joined: Dec 2006
Posts: 108
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Joined: Dec 2006
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Thanks Guys
I did not think there was a problem but have never had access to the data from the old Verizon circuit that I now have from the RAD. Just wanted to make sure.
The Adtrans are happy with it and so am I
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