silver peak -path conditioning - part 2 - loss mitigation by forward error correction

3, 2, 1 = data stream
p = parity packet
x = lost packet

3,2,1----silver peak=====isp network===p,3,x,1======silver peak-----p,3,2,1

1. parity data added to data stream;
2. extra parity packet is use to reconstruct missing data;
3. similar to RAID storage array to rebuild lost data;
4. use XOR gate; XOR result 1 if both argument are different & 0 if both same;
5. (101,011,100)=(010); 010 is parity
6. ratio of FEC packet can very dynamically;

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silver peak - path conditioning - part 1

path condition mitigate the effect of loss & delay;

BW, latency & loss all have an impact on effective throughput;

you can calculate throughput on silver peak website;

formula is :- Avg. throughput = (MSS/RTT)*(1.2/p^0.5)
mss= packet size; RTT = round trip time; p= packet loss;

PROBLEM:- data loss & packet out of order

SYMPTOMS:- video quality is poor with pixilation & halts; VOIP calls suffer poor quality(drop & echo)

these are commonly seen on MPLS & internet based ip vpn links

SOLUTION:- path conditioning

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