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Basics of Communications Presented By Patrick Bolwahnn April 14, 2005.

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Presentation on theme: "Basics of Communications Presented By Patrick Bolwahnn April 14, 2005."— Presentation transcript:

1 Basics of Communications Presented By Patrick Bolwahnn April 14, 2005

2 Today… Session Objectives –Learning and Understanding the Basics of Reader Communication Innovation –Terminology –Infrastructure Considerations –Equipment and Devices Results –The ability to understand and deploy a well designed reader network.

3 WT Background: Installed January 1998 Wired February 1998 Recarded Fall of 1998 Services Offered –Copy, Laundry, Vending, Bookstore –Point of Sale, Activity Validation –120 Locations

4 WT Background: FY –9000 Active Cardholders –$1.5 Million in Deposits Meal Plans – 300k Book Loans – 350k Flexible Spending – 850K –220 On-Campus Locations and 35 Off- Campus Locations –Door Access

5 Terminology: Network Processor - Transaction Approval Application Processor - Long Term Storage, DB Reader Networks – Communications Devices, Wiring and Readers Locations - Location Number a Reader is Assigned Loop - Physical Wire Addresses - numbers 0-15 assigned to reader

6 Terminology: Modems – communication device (RS232) Converters – Converts from one protocol to another. IP Communications – Communicating over a Data Network RS232 RS485

7 Terminology: Do you have to be a wiring expert? No Just need to know enough to make good decisions

8 Installation Considerations: AP/NP Location Number & Size of Buildings Number Readers in each building Cable topology – fiber, copper Network Strategy and Support –Data Network –Separate Reader Network / VLAN Power connections Shelf/rack space

9 WTAMU Communications: Remote Line Driver loops IPC loops –1 IPC Loops 25 Active Loops –24 Remotes Loop –2 RF Loops 265 Locations

10 Reader Networks: Consists of –Network Processor –Communications Devices –Cabling –Readers Cabling and Communication Devices make up the three basic reader loops –Local –Remote –IP Network

11 Network Processor: Network Processors communicates with each reader on the network and processes their transactions. NP’s Communication is handled through –CP16 Panels –Mux Panel –LAN Cards

12 Local Loops: Local loops are generally within the same building as the NP. Local loops can be accomplished two ways. –Use CP8 boards which have some RS-485 converters built in. –CP16 boards do not have converters –NP cable to RS 485 converter NP 485 Reader

13 Remote loops: A Remote Loop is any loop that services a remote building(s) or remote campuses. This can be accomplished through many combinations of devices. –Devices Types Terminal Servers(TS) via a Data Network or Internet Line Drivers RS 485 converters. IP Converters IP Readers

14 Communications Protocols: Protocols are like different languages. Some protocols the BTSUE system uses to communicate are: –RS 485 Allows multiple units to communicate over the same wire. ( 5 pin) –RS 232 Basic data communication used in PC and device communication, 1 – 1 ( 3 pin) –TCP/IP Standard Networking protocol which Terminal servers, IP Converters, & IP readers utilize on a data network.

15 Standard Communications: Line Drivers –Short haul modems = less than 2 miles –Long distance modems = more than 2 miles –Types of medium Fiber Copper –Uses Standard RS 232 protocol (3 pin)

16 Standard Communications: Special devices –Multiplexer –Loop Splitters

17 Standard Communications: RS 485 Converters –Design to convert RS 232 to 485 protocol –Has 1x10 jack to connect local reader cable network

18 Standard Communications: NP Line Driver 485 Reader Building A Line Driver Loop Spliter Building B Line Driver Building C Line Driver Computer Center

19 IP Communications: Terminal Servers –Designed to Convert RS232 to TCP/IP and back again. IP Converters –Design to convert TCP/IP to RS 485 protocol IP enabled Readers VR/MDB2

20 IP Communications: Data Network NP Terminal Server RS 485 Reader Terminal Server First IP Communications devices were terminal servers

21 IP Communications: IP Converters –Design to convert TCP/IP to RS 485 protocol

22 IP Communications: Data Network NP IP Converter RS 485 Reader IP Reader

23 Other Communication Methods: Radio Frequency –Blackbox RF-115 modem –900 Mhz RS232 protocol –Range up to 20 miles with repeaters

24 Wiring: Supported wiring –Belden pair with shield Use T568b wall plate with screw lugs or DB 15 –Cat 5 10base-T (most common installation) Twisted Pair Network Cabling Use T568b RJ45 standard network jack

25 Pros for communication types: Local Loops Lower cost – no LD or TS. -Fast response times. -Independent wiring – not attached to net. Line Driver -Fast Response times. -Independent wiring - not attached to data network. -Slightly Cheaper than TS. -Supported by Blackboard -Simple - No Configuration needed Always up! -Works with Copper and Fiber lines -Easy to troubleshoot IP - easiest/quickest to install, or move -Easy to diagnose communication problems??? -Comes back on-line fairly quickly, when the network is out -Could be used over the Internet to connect remote campuses

26 Cons for communication types: Local Loops -Difficult to move server. Line Driver -Difficult to move server. -Copper needs optical isolation - Cost of running wiring if not available IP -Network Outage -Denial of Service -Firewall and VLAN’s can block communication if not configured right. -Depends highly on relation- ship with IT

27 Security Issues with IPC: IPC’s Communicate with the NP with 128bit Blowfish encryption. No problems so far with denial of service attacks. Downstream communication between IPC and Reader is still vulnerable. Having the IPC on a VLAN and behind a firewall greatly increases security.

28 Recap: Installation Considerations –AP/NP Location –Number & Size of Buildings –Number Readers in each building –Cable topology – fiber, copper –Network Strategy and Support Data Network Separate Reader Network / VLAN –Power connections –Shelf/rack space

29 Links –Behind the Blackboard System Implementation Guide Follow up Contact Information If you remember one thing… There are many options for deploying your reader network


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