frame relay

https://docs.google.com/document/d/1zXuBAOnL2vcvemK6fXxYTESb-d9-xirxs9KUj91WDPQ/edit?hl=in
https://docs.google.com/document/d/15czUukjOp6EHKjnrq2I-kAcB8IGJx5f_JGNm3wb2eWA/edit?hl=in