DCN_rpj17

DCN_rpj17 - NT503: Data Communication & Networking...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
1 NT503: Data Communication & Networking Interface Standards & Modems
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 DTE/ DCE Interface ± DTE ( D ata T erminal E quipment): • Any piece of equipment at which a communications path begins or ends. • DTE equipment either generate or receive the data carried by the network. • e.g. computers, printers, terminals ± DCE ( D ata C ommunications E quipment OR Data Circuit- terminating Equipment): • This equipment sets up and maintains a data connection link over a communications medium • Allows transmissions between DTE’s • e.g. modem
Background image of page 2
3 Why Interfacing ? ¾ Digital signals have limitation on transmission distance, hence DTE can not be tied to the transmission link directly. ¾ DCE receives data from DTE at the transmission side and sends it over to transmission link PC modem modem PC DCE DTE DCE DTE RS-232C ¾ DCE receives data from the transmission link and passes it to DTE at the receiving side
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 RS-232C Interface In order to standardize the interface between DTE and DCE, the Electronics Industries Association has devised a standard known as RS-232C. This interface standard is described by means of, Mechanical Electrical Functional and Procedural specifications Mechanical specifications: • RS-232C is a 25 pin connector, where pins are organized in two rows • Pins numbered 1-13 are in the top row and 14-25 are in the bottom row
Background image of page 4
5 RS-232C Interface (continued…) Electrical specifications: • Voltage greater than +4 volts is considered as logical 0 and a voltage less than –3 volts is considered as logical 1. • Cable length between two RS-232C connectors can range a maximum of 15 meters and can support data rates of 20 Kbps !! Functional specifications: • Although RS-232C is a 25 pin connector, only 9 of the pins are always used in practice. • Four groups: Data, control, ground and timing • Data group: Transmit (Tx) pin 2 and Receive (Rx) pin 3
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
6 RS-232C Interface (continued…) Control group: • Request To Send (RTS) …. . pin4 • Clear To Send (CTS) …… pin 5 Timing group: • Includes clock signals that are used for synchronous transmission Procedural specifications:
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/15/2011 for the course ECO 2023 taught by Professor Mr.raza during the Summer '10 term at FAU.

Page1 / 31

DCN_rpj17 - NT503: Data Communication & Networking...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online