DCP Series X.25 Packet Switched Communications Software (PSCS ...

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Introduction 1.1.9. Special Capabilities 1–8 In addition to the basic network access capability X.25 PSCS offers, it also supports some optional capabilities. You can use these capabilities, however, only if the network to which your DCP is connected offers them. These capabilities are listed below: • Maximum packet sizes of 16, 32, 64, 128, 256, 512, 1024, 2048, and 4096 octets. You can configure different sizes for input and output packets. • Maximum frame sizes of 16, 32, 64, 128, 256, 512, 1024, 2048, and 4096 octets. • Packet window sizes between 1 and 7, enabling up to 7 outstanding unacknowledged packets. • Frame window sizes between 1 and 7 for standard communications lines and 1 and 127 for ILM-20 lines. • Permanent virtual circuits (PVCs), which assure that a transmitting DTE connects to a receiving DTE. PVCs do not require call setup or clearing procedures. • Priority virtual circuits, which ensure that traffic on a low priority circuit does not delay traffic on a higher priority circuit. • Closed user groups (CUGs), which restrict access to certain DTEs. • Fast select, which enables a DTE to send a call request packet that contains up to 128 octets of data. The receiving DTE can respond with a call accepted or clear indication packet that contains 128 octets of data as well. • Flow control parameter negotiation, which enables a DTE to negotiate a packet level window size on a per call basis. • Multilink procedure, which groups links into a single entity. The multilink procedure improves performance because the bandwidth of the group is larger than any single link. It also improves reliability because if one link in the group fails, others may still be available. • One-way logical channels, which reserve certain channels for incoming traffic and other channels for outgoing traffic. • Recognized private operating agencies (RPOAs), which designate the intermediate carrier (network) through which a virtual circuit connection passes to reach its destination. 7831 5470–200
• Reverse charging, which enables the following: – Charging outgoing calls to a receiving DTE – Refusing incoming calls that specify reverse charging Introduction • Throughput class negotiation, which enables negotiated throughput rates with the network on a per call basis. • Transit delay, which specifies the maximum amount of time a packet has to reach its destination. • D-bit and M-bit implementations, which enable you to specify whether the network or the receiving DTE provides acknowledgments. The M-bit implementation enables communicating DTEs to maintain data integrity when the network divides data blocks into smaller packets. ——————————————————————————————————————— 1.1.10. DTE Routing and Routing Precedence X.25 PSCS previously used three routing methods for incoming call packets: a calling DTE address match, a protocol identifier match, and the configured default Level 4. Previous routing precedence could not be altered by the user. The DTE Routing and Routing Precedence feature provides a method for selecting a Level 4 based on subaddress. It also allows you to configure the order in which the methods are applied. The X25ROUTE statement specifies the precedence and routing used by a given line or network. ——————————————————————————————————————— 1.1.11. Minimizing Packet Layer Services (PLS) DTEs Packet layer services (PLS) is a software feature included in X.25 PSCS that, in combination with a host PLS driver, allows data communications between dissimilar host systems. In earlier releases of X.25 PSCS, PLS required an EU card specifying a DTE configuration card for every DTE that PLS connected, and one EU/DTE pair for every line used to connect with PLS. With the release of X.25 PSCS 5R2, you can eliminate duplicate EU/DTE pairs, increasing the speed of the connection process and reducing initialization overhead. ——————————————————————————————————————— 7831 5470–200 1–9
Page 1 and 2: Product Information Announcement Ne
Page 3 and 4: NO WARRANTIES OF ANY NATURE ARE EXT
Page 5 and 6: Contents vi Section 2. Configuring
Page 7 and 8: Contents viii 5.6. SWITCH — Rerou
Page 9 and 10: Contents x Appendix A. X.25 PSCS Re
Page 11 and 12: Figures xii 4-16. X.29 PAD with Con
Page 13 and 14: About This Guide Purpose Scope The
Page 15 and 16: Section Description Section 4 Confi
Page 17 and 18: Related Product Information About T
Page 19 and 20: Document Name/Number Description DC
Page 21 and 22: Section 1 Introduction Section 1 pr
Page 23 and 24: 1.1. X.25 PSCS Product Overview Int
Page 25 and 26: 1.1.3. Idle Trunk Circuit Handling
Page 27: SNA DCA Introduction X.25 PSCS prov
Page 31 and 32: 1.2. X.25 PSCS Limitations X.25 PSC
Page 33 and 34: 1.4. DCE Network Limitations The DC
Page 35 and 36: 1.6. Migration Issues Introduction
Page 37 and 38: 1.6.2. Level 4 Program Definition f
Page 39 and 40: Configuring Standard X.25 PSCS Capa
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Configuring Standard X.25 PSCS Capa
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Section 3 Configuring a DCE Network
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3.1 Planning the Network Configurin
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3.1.2 Rules for Creating Network Ad
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Figure 3-3 illustrates address comp
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• At least one X25DEF statement t
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Procedure Provide the following sta
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3.2.2 Adding a Node and DTEs to a D
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Example Configuring a DCE Network
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Procedure Configuring a DCE Network
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Configuring a DCE Network ———
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Procedure Provide the following add
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Configuring a DCE Network
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Procedure Provide the following add
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Configuring a DCE Network 3.3 Confi
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Configuring a DCE Network When DTED
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3.3.3 Configuring Reverse Charging
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3.3.5 Configuring DTE Hunt Groups P
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3.3.6 Configuring DTE Subaddresses
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3.3.7 Configuring an ILM-20 Connect
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Example Configuring a DCE Network T
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Configuration Examples 4-2 Section
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Configuration Examples CMS configur
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Configuration Examples 4-6
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Configuration Examples 4.2 DCP-to-D
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Configuration Examples Telcon confi
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Configuration Examples 4.3 DCP-to-D
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Configuration Examples 4.5 DCP-to-U
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Configuration Examples 4-28 Figure
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Configuration Examples 4.8 X.29 PAD
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Configuration Examples 4-42 Figure
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Configuration Examples 4.10 Two-Nod
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Section 5 Using Network Management
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Using Network Management Services (
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TERM=name A terminal to deactivate.
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Figure 5-1 is an example of LIST LI
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5.4 RECORD — Controlling DCE Netw
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5.5 STAT — Displaying Status Form
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5.5.1 STAT LINE Display STAT Figure
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5.5.2 STAT PDTE Display Figure 5-3
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5.5.3 STAT PTRK Display Figure 5-4
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5.6 SWITCH — Rerouting Call Packe
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5.7 TRAC — Message Tracing TRAC T
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DATA Fields for the Items to Trace
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Example 2 Example 2 sets the file s
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5.7.2 TRAC SNAP DCEF Format The TRA
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5.8 UP — Activating a Facility Fo
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Section 6 Using X.25 PSCS Configura
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Section Topic Using X.25 PSCS Confi
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6.2. DTE — Defining Data Terminal
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DCATS=sname A DCATS statement. Use
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RPOA=dnic Specifies the data networ
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6.2.2. DTEs on DCE Networks Format
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Examples DCECUG=(opt,a[,b][,c][,d])
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6.3. DTETYPE — Defining DTE Commu
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X29PAD Specifies an X.29 network PA
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PAKSIZ=(ipps[,opps]) DTETYPE Specif
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Examples Example 1 DTETYPE Example
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6.3.2. DTETYPEs for DCE Networks Fo
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6.4. EU — Defining X.25 PSCS End
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Accunet (USA) Arpac (Argentina) Aus
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Example 4 Example 4 provides the sa
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Example The following example defin
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Example The following example shows
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6.5.2. LCLASS For ILM-20 Lines Form
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Example 2 LINE Example 2 defines a
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6.7.1. PDNGRPs for PDNs and Private
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Examples OPTIONS=(opt1,opt2,...) Sp
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6.7.2. PDNGRPs for the DDN Format P
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IMP=(psn) PDNGRP Specifies an IMP o
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6.7.3. PDNGRPs for DCE Networks For
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Online configuration differences PD
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X3P02=value Defines echo function.
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X3P10=value Defines the line foldin
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X3P19=value X3P20 X3P21 Defines the
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Example 2 PDNPAD Example 2 defines
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Example The following example defin
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6.10. X25DEF — Defining Network C
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Table 6-3. Network Names and Mnemon
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Parameters NAME='net-name' X25DEF S
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DTETYPE=dtype X25DEF Specifies a DT
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L3OPT=(option1,...,option31) Level
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Examples Example 1 Example 1 define
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6.11. X25NET — Defining DCE Netwo
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6.12. X25ROUTE — Specifying Routi
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Example PROTOCOL=(lvl4[,lvl4]...)(A
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Section 7 X.25 PSCS Troubleshooting
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7.2 Verifying Line Operation X.25 P
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7.2.1.2 Determining If X.25 PSCS In
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X.25 PSCS Troubleshooting DCP/OS al
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7.2.2.1 Physical Layer Connection X
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7.3 Verifying Virtual Circuit Conne
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7.3.3 Connection Troubleshooting Ac
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7.4 Verifying Message Data Transfer
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7.4.1.3 Determining Adequate DCP/OS
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Facility Constraints X.25 PSCS Trou
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Appendix A X.25 PSCS Reserved Words
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X.25 PSCS Outgoing Call Routing Con
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X.25 PSCS Outgoing Call Routing Con
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NMS TRAC Command Trace File Formats
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NMS TRAC Command Trace File Formats
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Glossary A asynchronous transmissio
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Glossary data unit control (DUC) Th
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DTP DTPX DUC E See DCA transport pr
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Glossary hunt group An optional X.2
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Glossary logical channel A network
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Glossary packet layer services (PLS
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Glossary Recommendation X.29 A ITU/
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U U Series The family of U 6000 har
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Index A Accunet, 1-7, 6-27, 6-63 to
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Datapac, 1-7, 6-27, 6-63 to 6-64 Da
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M M-bit implementation feature desc
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tracing messages, 5-21 transit dela
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