What is Packet Data Networks

-

There are a several different types of wide area packet data networks that can support integrated voice/fax traffic, with varying degrees of success. The principal data network technologies in use today are X.25, Frame Relay, ATM, SNA, Novell/IPX, TDM, and TCP/IP. Because TDM is not a packet technology, it is much less efficient than the other technologies, and is rapidly being replaced by them. X.25 and SNA, based on older packet technologies, are too slow and delay-prone to effectively carry voice and fax traffic. The Novell/IPX technology was designed primarily for LAN applications and does poorly in the WAN environment; it is quickly being replaced by TCP/IP.


The remaining packet technologies – Frame Relay, ATM, and TCP/IP – are the principal networking techniques companies use today to build new wide area data networks. Today’s WANs are constructed using leased lines running these three technologies, and using public data network services based on them. By a substantial margin, Frame Relay and TCP/IP are used the most, both over leased lines and as public data services.


ATM, Frame Relay, and TCP/IP are each able to carry voice and fax traffic. ATM has been designed from the beginning to carry voice/fax traffic, while Frame Relay and TCP/IP were originally designed to carry only data. Because adding voice and fax to Frame Relay and TCP/IP has been an ‘after market’ activity, there are areas of caution and even concern that must be addressed when building integrated WANs using Frame Relay or TCP/IP.

Popular posts from this blog

Open Blocked Web Site in any Country

-
How to Open Blocked Web Site Like Youtube, if any web site blocked in any Country by using proxy address you can open web site in your country i have some sample proxy address free for you. use it and enjoy it Thanks 061244235034.static.ctinets.com:3128 112.65.135.54:8080 114.143.12.28:8080 118.175.12.178:3128 118.228.148.52:3128 118.98.169.50:80 119.147.113.116:80 119.167.219.78:80 119.180.24.12:8080 119.245.230.164:80 119.62.128.38:80 119.70.40.101:8080 119.70.40.102:8080 121.10.120.214:80 121.14.158.76:80 121.30.255.38:8080 122.139.57.46:80 122.139.60.102:8080 122.224.33.10:80 122.224.33.4:80 125.64.96.21:8008 147.91.193.101:80 173-203-206-253.static.cloud-ips.com:80 174.142.104.57:3128 174.142.24.201:3128 174.142.24.203:3128 174.142.24.205:3128 174.142.24.206:3128 187.51.150.2:8080 189.115.161.205.static.gvt.net.br:8080 189.3.177.146:8080 189.3.47.146:3128 189.3.50.34:3128 196.12.52.2:80 196.38.158.197:80 201.45.216.115:3128 201.73.223.150:8080 202.51.105.10:3128 202.51.107.37:8080
Read more

OPERATION OF STENO PHONE

-
OPERATION OF STENO PHONE 1 EXTENSION WANTS TO TALK TO MAIN STATION Lift the handset at ext. and depress the call push button, buzzer at main station will ring after lifting the handset at main station and by throughing the key at main station to right side, ext can talk with main station. 2 MAIN STATION WANT TO TALK TO EXTENSION Main station through the key towards the right side and depress the pushbutton, the buzzer will ring at ext. Main station can talk with ext when handset is lifted at the ext. 3 INCOMING CALL DURING CONVERSATION BETWEEN MAIN AND EXTENSION The exchange call can only be received at the main station by throughing the key to the middle position, main can talk with exchange. INCOMING CALL 4 MAIN STAION WANTS TO HOLD THE INCOMIN CALL AND CONSULT THE EXTENSION Main station press the pushbutton and through the key again towards the right. 5 MAIN STATION WANTS TO CALL AGAIN WITH EXCHANGE Through the key again back in middle position. 6 EXTENSION WANTS TO GET THE EXCHANG
Read more