Chapter III of Computer Network will teach you about Physical Layer and it is of 4 teaching hrs.
This chapter will provide you information about
3.1. Guided Media: Copper, Fiber cabling and its capacity standards
3.2. Unguided Media: Bluetooth, Wi-Fi/Wireless-LAN, Satellite Communication Basics
(Micro waves, Radio waves)
3.3. Circuit/packet/message switching
3.4. ISDN Signaling & Architecture
3.5. Network Performance: Bandwidth, Throughput, Latency, Bandwidth-Delay Product,
Jitter