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Go-Back-N ARQ is a specific instance of the automatic repeat request (ARQ) protocol, in which the sending process continues to send a number of frames specified by a window size even without receiving an acknowledgement (ACK) packet from the receiver. It is a special case of the general sliding window protocol with the transmit window size of N and receive window size of 1. It can transmit N frames to the peer before requiring an ACK.
The receiver process keeps track of the sequence number of the next frame it expects to receive, and sends that number with every ACK it sends. The receiver will discard any frame that does not have the exact sequence number it expects (either a duplicate frame it already acknowledged, or an out-of-order frame it expects to receive later) and will resend an ACK for the last correct in-order frame. Once the sender has sent all of the frames in its window, it will detect that all of the frames since the first lost frame are outstanding, and will go back to the sequence number of the last ACK it received from the receiver process and fill its window starting with that frame and continue the process over again.
Go-Back-N ARQ is a more efficient use of a connection than Stop-and-wait ARQ, since unlike waiting for an acknowledgement for each packet, the connection is still being utilized as packets are being sent. In other words, during the time that would otherwise be spent waiting, more packets are being sent. However, this method also results in sending frames multiple times – if any frame was lost or damaged, or the ACK acknowledging them was lost or damaged, then that frame and all following frames in the window (even if they were received without error) will be re-sent. To avoid this, Selective Repeat ARQ can be used.
Altamont G10 Smooth K/L frame. With new screw. looks like new / minor scuff marks. $40
Smith and Wesson factory grips from the 686 "3-5-7" Plus models. $50 each
(Made by Altamont for Smith, I removed these myself from new guns)
Hogue N frame Round Butt NEW in package. $20
Used Pachmayr K...
Silver scope mount base and rings, new in packaging, from Weigand Combat Handguns Inc.
- Scope Mount Base for Smith & Wesson factory drilled and tapped K, L, & N frame revolvers: SWHPMNTS
- Weigand Combat Handguns Inc. 1” Scope Mount Rings: MRNG1S*
Rings and base are new, never...
Selling my spare pair of Herrett Jordan Troopers, they are for a N frame with Round Butt. Minor handling marks, nothing that affects the finish. These are walnut. $85TYD, PayPal is preferred, otherwise a USPS Money Order will work. Grips will be cross posted, so first time stamp “I’ll take it”...
Have a Tex Shoemaker 50 Mag left handed S&W N Frame leather holster. Would like to trade for right handed similar leather right handed holster. Fits 4 in S&W highway patrol .357. Work in Oregon City live in Vancouver. Can meet most nifhts after 6pm along I205.
Retail last year was $215 (base is $145, IWB clips are $10, Master series upgrade is $65). You will wait a long time if you order one.
Master series means The inner face of the gun sleeve is face leather, not the rough back, which protects your firearm better and makes for smoother...