3Com S200 manual PAD XON/OFF Support Using X.25 Interrupt Packets, How It Works

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PAD Port Configuration

PAD XON/OFF Support Using X.25 Interrupt Packets

What is It?There is a Customer Software Key (CSK) that enables the transmission of XON/ XOFF asynchronous data characters across a Public Data Network (PDN) using X.25 Interrupt packets.

This improves the transmission of flow control information between local and remote PAD ports on PathBuilder S200 series switches. Since X.25 Interrupt packets travel at a higher priority through the PDN, flow control information between PAD ports is communicated more thoroughly by letting you control the starting and stopping of the asynchronous data characters stream.

How It Works

By enabling the CSK for this feature whenever a PathBuilder S200 series switch

 

PAD port receives an XON or XOFF flow control character from a user terminal or

 

networking device, the XON/OFF enhancement sends the flow control characters

 

across the PDN as X.25 Interrupt packets for faster transmission to the remote PAD

 

port.

For example, as shown in Figure 5, when User 1 wants to stop User 2 from sending information, User 1 sends an XOFF character to the PAD port on the local PathBuilder S200 series switch. Then the local PathBuilder S200 series switch sends an X.25 Interrupt Packet to the remote node on the other side of the network, where the XOFF character is passed on to User 2. This stops User 2 from sending anymore data.

To let User 2 send information again, User 1 sends an XON character into the PAD port on the local PathBuilder S200 series switch, which sends an X.25 Interrupt Packet to the other node, and the XON character is passed on to User 2. This allows User 2 to begin sending data again.

X.25 ports

PAD Port

PAD Port

PB S200

X.25 VC

PB S200

PDN

User 1

 

User 2

Figure 5. Example of Transmitting XON/OFF Frames Across PDN with X.25 Interrupt Packets

Note

The user devices shown in Figure 5 can be networking devices or asynchronous user terminals. Remember that the CSK for this feature must be enabled in order to transmit flow control characters as X.25 Interrupt packets. If the CSK is not enabled, the feature is not supported.

Also, for this feature to work, user devices at both ends of the network must be connected to PathBuilder S200 series switches.

Set the PAD Profile record parameters Device Flow Control and PAD Data

Restraint to 1 for both PAD ports. Enabling the PAD Enhancement CSK.

Configuring PAD/ATPAD Ports

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Contents 3Com Corporation Restricted Rights Legend Restricted Rights Notification for U.S. Government UsersProprietary Material Page Contents Page Overview Configuring PAD/ATPAD PortsIntroduction Before You BeginAbout Packet Assembler/Disassembler Example Typical ApplicationsPAD Port PAD Port ConfigurationConfiguration Record If You Specify or Set Then GuidelinesStep Action Result Use Connection Type When ParametersConnection Type Port Control Use Connection TypeAuto Baud Sequence Port SpeedCRONLY, CRDOTCR, TYMNET, Telenet CronlyDevice Parity Data Bits per CharacterNONE, SPAC, MARK, EVEN, ODD, Auto Number of Stop BitsNONE, AUTO, AUTC, PCUD, IBAR, OBAR, MNEM, Tmnem Call ControlCUGOA, BMSG, ADDR, FRCB, Cugia Terminal ControlNONE, PASS, LIM, CUG, LCPY, 7BIT, NADD, X.28, Cnui PAD Prompt Entry Number Autocall Timeout secRemote PAD Parameters Number Autocall MnemonicSubaddress Maximum Number of Autocall AttemptsGroup Subaddress CUG MembershipInvitation to clear Call Accept Timeout secBilling Records Protection Level Reconnection TimeoutNONE, CPONLY, Fulldcp Reconnection Tries LimitMaximum Receive Buffer Length Calling DTE PasswordCalled DTE Address Calling DTE IdentifierNUI verification timer PAD Command LanguageNUI Facility Format Max NUI violationsNONE, DISC, DEGR, Lock Action Type for NUI violationsInitiating an AutoCall Mnemonic Addressing PAD Port Configuration for AutocallingSdlc Mnemonic Autocall Addressing Sdlc Mnemonic AddressingPAD Port Configuration for Autospeed How It Works PAD XON/OFF Support Using X.25 Interrupt PacketsStep Action PAD Prompt Table Record Before You Begin Accessing the PAD Prompt Table RecordWhat You See This RecordPAD Prompt Text PAD Prompt Table Record ParametersEntry Number Introduction What You See In This Record PAD Profile Table RecordSelect PAD Profile Table from Configuration GuidelinesAccessing the PAD Profile Table Record #1, PAD Recall PAD Profile Table Record Parameters#3, Data Forwarding Character #4, Idle Timer Delay#2, Echo #5, Device Flow Control #6, Service Signals Control#10, Line Folding #7, Break Signal Operation#9, Padding After Carriage Return #13, Line Feed Insertion after CR #12, PAD Data Restraint#15, Editing #14, Padding after LF#16, Character Delete #17, Line Delete#19, Editing Type #18, Line Display#21 Parity Treatment #20, Echo Mask#100, Break Character #22, Page Wait#101, Echo Substitution Toggle Character #102, Echo Substitution Character#104, Xoff Character #105, Control Signal EIA-232-D Data Restraint#103, XON Character #108, Disconnect Character #107, Idle Disconnect Timer#106, Network Parity #109, Form Feed Padding #110, Esc Forwarding Delay Handling#113, Hewlett-Packard Flow Control #111, Echo Control#112, Dynamic Data Forwarding #115, Data Forwarding Criteria #114, PAD Mode#116, Short Timer Duration #119, DCD to Data Timer Duration #117, EIA Signalling Action#118, Message Assembly PAD Profile Table Copying PAD Profile Tables into a ConfigurationSize Select Copy/Insert RecordPrinter Parameter Name Default Test Simple TransparParameter Values Stored In Memory TPA Hpea Hpxon Host Rmot Parameter NameTPA Hpea Hpxon Host Rmot Message Parameter INT1984 IRANSP1PAD Bulletin Select Remote PAD Parameter Remote PAD Parameter Table RecordRemote PAD Parameter Table Record Parameters #1 Parameter Number #1 Parameter Value Function Detailed PAD Port StatisticsDescription Terms First Screen Screen Term Tells YouExample of Detailed PAD Port Statistics, Second Screen NullDescription Terms Second Screen Example of Detailed PAD Port Statistics, Third Screen Atpad Ports Data Forwarding Criteria Atpad OperationCriteria Descriptions If you want to Then useXON/XOFF Flow ControlAtpad Application Environment Network Parity Application Response Delay DTR TimeoutUse these guidelines when you enter Atpad commands ConfigurationConfigure Atpad Port Menu NULL, PAD, X25, SDLC, FRI, ATPAD, PPP Port TypePAD SIMP, DTRParity Data BitsNONE, SPAC, MARK, EVEN, ODD Stop BitsLine Feed Character Carriage Return CharacterBack Space Character Data Forwarding CharacterData Forwarding Timer Escape Sequence TimerXON Character NONE, CNTL, XoffPacket Size Answer ModeEcho Stored AddressesALPHA, NUM, None Result CodesAlpha Restricted Connection DestinationNONE, SPAC, MARK, Even Protocol IDNetwork Parity Atpad Port Statistics Screen Atpad Port StatisticsNull Description Terms Second Screen Technical Support Country Data Rate Telephone Number Access by Analog ModemCountry Telephone Number Support from3Com Country Telephone Number Fax Number ReturningIndex SymbolsNumerics ApadIndex-2 URL Sdlc
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S200 specifications

The 3Com S200 is a cutting-edge networking solution designed to meet the demands of small to medium-sized businesses. Renowned for its reliability and performance, this switch offers seamless integration and enhances network efficiency through advanced features and technologies.

One of the standout features of the 3Com S200 is its versatility. With a variety of ports ranging from 8 to 48, the switch provides ample connectivity options for various devices. This flexibility makes it an ideal choice for businesses aiming to expand their network without the need for extensive infrastructure changes. Built-in support for Power over Ethernet (PoE) enables users to connect and power devices such as IP phones and cameras, simplifying wiring and installation.

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In conclusion, the 3Com S200 stands out as a reliable, efficient, and secure networking solution. With its versatile port options, Layer 2 capabilities, user-friendly management interface, and robust security features, it is an excellent choice for businesses looking to enhance their network infrastructure. Whether scaling operations or optimizing current performance, the 3Com S200 provides the technology and reliability needed to thrive in today’s digital landscape.
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