The document discusses digital data transmission interfaces and modems. It describes the DTE-DCE interface standard used for communication between data terminal equipment and data circuit-terminating equipment. The EIA-232 interface standard is examined in detail, including descriptions of its various data, control, timing and other pins used for serial transmission. Synchronous full-duplex transmission and pin connections with and without modems are also illustrated.

2. Figure 6-1 My Notes for DataCom :: @nkur 

3. Parallel Transmission Figure 6-2 My Notes for DataCom :: @nkur 

4. Serial Transmission Figure 6-3 My Notes for DataCom :: @nkur 

5. Asynchronous Transmission Figure 6-4 My Notes for DataCom :: @nkur 

6. Synchronous Transmission Figure 6-5 My Notes for DataCom :: @nkur 

7. DTEs and DCEs Figure 6-6 My Notes for DataCom :: @nkur 

8. DTE-DCE interface Figure 6-7 My Notes for DataCom :: @nkur 

9. Sending Data Figure 6-8 My Notes for DataCom :: @nkur 

10. Control Figure 6-9 My Notes for DataCom :: @nkur 

11. EIA-232 Figure 6-10 My Notes for DataCom :: @nkur 

12. Data Pins Figure 6-10-continued My Notes for DataCom :: @nkur 

13. Control Pins Figure 6-10-continued My Notes for DataCom :: @nkur 

14. Timing Pins Figure 6-10-continued My Notes for DataCom :: @nkur 

15. Other Pins Figure 6-10-continued My Notes for DataCom :: @nkur 

16. Figure 6-11 My Notes for DataCom :: @nkur  Synchronous Full-Duplex Transmission

17. Figure 6-11-continued My Notes for DataCom :: @nkur  Synchronous Full-Duplex Transmission

18. Figure 6-12 My Notes for DataCom :: @nkur  Pin Connection With and Without DCEs

19. Figure 6-12-continued My Notes for DataCom :: @nkur  Pin Connection With and Without DCEs

20. Figure 6-13 My Notes for DataCom :: @nkur  Null Modem