ANALOG AND DIGITAL PHYSICAL INTERFACES
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1 ANALOG AND DIGITAL PHYSICAL INTERFACES Habib Youssef, Ph.D Department of Computer Engineering King Fahd University of Petroleum and Minerals Dhahran, Saudi Arabia COMPUTER NETWORK
2 T h e R S-232/CCITT V.24 and V.28 Interface Computer RS-232/CCITT V.24 Data Data Computer DTE Modem DCE Modem DCE DTE Out of Band Control Out of Band Control DTE : Data Terminal Equipment DCE : Data Circuit Termination Equipment
3 The RS-232/CCITT V.24 and V.28 Interface (Cont.) Data processing (DTE) to modem (DCE) interface The CCITT V.24 Recommendation defines the interchange circuits» V.28 defines the electrical characteristics
4 The RS-232/CCITT V.24 and V.28 Interface (Cont.) In EIA, known as RS-232-C (the third [- C] version of RS-232)» More recent version of RS-232-D (now EIA- 232-D)» Sometimes TIA-232-D (Telecommunications Industry Association)
5 The RS-232/CCITT V.24 and V.28 Interface (Cont.) A 25-pin connector/interface» ISO 2110 is used» Is not part of the RS-232-C standard Bit serial data (full duplex) Out of band control lines
6 The RS-232/CCITT V.24 and thnulmodems V.28 Wi DTE Data Data Req to Send Clear to Send Data Set Ready Signal Detect Data Terminal Ready Null Modem Data Data Req to Send Clear to Send Data Set Ready Signal Detect Data Terminal Ready DCE 7 Signal Ground 7 Note : There are many variations to Null Modem Cross Connection
7 Pin Assignments for V.24/EIA- 232 Shield Tx Data Rx Data Reg to Send Clear to Send DCE Ready GND Carrier Detect Reserved for testing Reserved for testing Unassigned Secn. Recv. Line Signal Detector Secn. CTS Transmitter signal element timing Secondary Tx Data Secondary received data Transmitter signal element timing Secondary RTS Remote Loopback Local DTE Ready Loopback Ring Indicator Data Signal Rate Select Transmit signal element timing Test Mode
8 RS-232/CCITT V.24 & V.28 Related Products It is often convenient to switch RS- 232/V.24 signals from a computer to one of several devices» For example, to different types of printers Simple multiple switches are available for this purpose
9 RS-232/CCITT V.24 & V.28 Related Products (Cont.) Specialized companies have been developed to handle the interface market with products such as» Multiple switches» RS-232/V.24 cables» Null modems» RS-232/V.24 gender changers Breakout boxes to monitor control signals
10 Limitations of RS-232/V.28 An upper data rate of about 20 kbit/s An upper cable length of about 50 to 100 feet (about 20 to 40 m) Some products are available to extend these, but a new approach is needed
11 The Evolution of RS-232-C RS-232-C RS-449 signals RS-422/423 electrical (1977) RS-442 balanced circuits RS-443 unbalanced circuits RS-530 (1987) Balanced Circuits EIA-232-D (1987) Unbalanced circuits V.35 Balanced Circuits
12 Synchronous Transmission Has a known timing relationship between bits and characters Characters are sent one after the other The receiver recovers this timing from transitions in the arriving data 1 0 Start End Characters
13 V.24/EIA-232 dial-up operation
14 Single Ended Interchange Circuit Noise Error Trans Recvr Signal return Note: V.10 is the same as X.26 or RS-423-A (unbalanced)
15 Differential Interchange Circuit Noise Sensitive to differential signal Trans Recvr Noise was rejected Termination resistor Note : V.11 is the same as X.27 or RS-422-A (balanced)
16 CCITT X.21 Interface Physical-level interface between DTE and DCE For synchronous operations on public data networks X.21 uses control transitions and ASCII characters rather than using separate signal lines
17 CCITT X.21 Interface (Cont.) The X.21 electrical characteristics are» CCITT X.27 (balanced; same as V.11 and RS-422)» CCITT X.26 (unbalanced; V.10 and RS- 423) (Note: For operation above 9600 bit/s, X.27 is required) X.21 mechanical characteristics are» 15-pin connector per ISO Standard 4903
18 CCITT X.21 Interface (Cont.) Switched 64 kbit/s X.21 4 DSU Bridge
19 CCITT X.21 Interface (Cont.) Circuit Name Direction To DCE / To DTE G Ground,Common Return Ga DTE Common Return X Gb DCE Common Return X T Transmit X R Receive X C Control X I Indication X S Signal Timing X B Byte Timing (Optional) X
20 CCITT X.21 bis As an interim (perhaps longer term) provision, we have X.21 bis X.21 bis utilizes RS-232 for use with X.25 Particularly used in countries where X.21 has not yet become available
21 CCITT X.21 bis (Cont.) RS-232 signals are used to represent X.21 events» To initiate the call Some X.21 features are not supported» Call progress signals
22 ISDN Interface Terminal Equipment (TE) Network Equipment (NE) Power Source 3 a b c a b c Transmit d d Transmit Receive e e Receive f f Power Sink2 g h g h Power Source 2
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