# Collision timing and backoff

Subject: Computer Networks

Exam: TEE

Reader: https://deep-learning-study-room.vercel.app/cn/#tee/practice/formulas/csma

Canonical: https://deep-learning-study-room.vercel.app/read/cn/tee/practice/formulas--csma/

TEE · symbols explained; worked examples linked below



$$
L_{\min}\geq 2RT_p
$$



R=bits/s; Tp=one-way seconds. Theoretical collision-detection bound.



$$
k=\min(n,10),\quad 0\leq K\leq 2^k-1
$$



n collisions; K selected integer for classic Ethernet backoff.



$$
T_{\mathrm{backoff}}=KT_{\mathrm{slot}}
$$



Multiply selected K by slot duration, retaining units.

## Learn it with complete solutions

[Minimum-frame examples](https://deep-learning-study-room.vercel.app/read/cn/tee/practice/csma--minframe-1/)