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MTASR1-100 Owner’s Manual
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1.3 Network Overview
Network architecture defines how computer equipment and other devices are linked together to form a
communications system that allows users to share information and resources. There are proprietary network
architectures and open architectures like the Open Systems Interconnection (OSI) model defined by the
International Organization for Standardization (ISO). The OSI model defines a layered model for an open
systems environment in which a process running in one computer communicates with a similar process on
another computer if they implement the same OSI layer communications protocol. The OSI protocol stack
shown in Figure 1-2 is commonly used as a reference. During a communications session, processes running
in each layer on each computer communicate with one another. The bottom layer defines the actual physical
components such as connectors and cable and the electrical transmission of data bits between systems. The
layers immediately above define data packaging and addressing methods. Still further up are methods for
keeping communication sessions alive. Finally, the uppermost layers describe how applications use the
underlying communication systems to interact with applications on other systems.
Application Layer 7
Presentation Layer 6
Session Layer 5
Transport Layer 4
Network Layer 3
Data-Link Layer 2
Physical Layer 1
Figure 1-2. OSI Protocol Stack
Protocols are loaded into a computer as software drivers. Each layer of the protocol stack defines a specific
set of functions. An application at the uppermost layer interacts with the layer below when it needs to send
information to another system on the network. The request is packaged in one layer and passed down to the
next layer, which adds information related to functions handled at that layer, creating a new packet within a
packet. This package is then passed down to the next layer and the process continues. Each layer adds
information to the message packet and this information is read by the corresponding layer in the receiving
system's protocol stack. In this way, each protocol layer communicates with its corresponding protocol layer to
facilitate communication.
The physical layer defines the physical characteristics of the interface, such as mechanical components and
connectors, electrical aspects such as voltage levels representing binary values, and functional aspects such
as setting up, maintaining, and taking down the physical link. Well known physical layer interfaces for data
communication include RS-232 and RS-449, the successor to RS-232.
The data-link layer defines the rules for sending and receiving information across the physical connection
between two systems. This layer encodes and frames data for transmission, in addition to providing error
detection and control. Because the data-link layer can provide error control, higher layers may not need to
handle such services. However, when reliable media is used, there is a perfomance advantage by not
handling error control in this layer, but in higher layers.
The Network layer defines protocols for opening and maintaining a path on the network between systems. It is
concerned with data transmission and switching procedures, and hides such procedures from upper layers.
The network layer can look at packet addresses to determine routing methods. If a packet is addressed to a
workstation on the local network, it is sent directly there. If it's addressed to a network on another segment,
the packet is sent to a routing device, which forwards it on the network. Some commom protocols occupying
the network layer are Internet Protocol (IP), X.25, Novell's Internetwork Packet Exchange (IPX), Banyan's
VINES Internet Protocol (VIP).
The transport layer prodvides a high level of control for moving information between systems, including more
sophisticated error handling, prioritization, and security features. It provides quality service and accurate
delivery by providing connection-oriented services between two end systems. The transport layer controls the
sequence of packets, regulates traffic flow, and recognizes duplicate packets. It assigns packetized
information which is a tracking number that is checked at the destination. If data is missing from the packet,
the transport layer at the receiving end arranges with the transport layer of the sending system to have
packets retransmitted. This layer ensures that all data is received and in the proper order.
- Model MTASR1-100 1
- Single WAN 1
- Multi-Protocol Router 1
- Owner’s Manual 1
- Owner's Manual 2
- 82052804 Revision E 2
- Contents 3
- 1.1 Introduction 8
- 1.2 About This Manual 8
- 1.3 Network Overview 10
- 1.3.1 Packet 11
- 1.3.2 Network Address 12
- 1.4 Typical Applications 14
- 1.4.1 Typical IP Application 14
- 1.4.3 Subscription 16
- 1.4.4 Configuration 17
- 1.5 Specifications 21
- Requirement 21
- 2.1 Introduction 24
- 2.2 Front Panel 24
- 2.3 Back Panel 25
- 2.4 Shunts 26
- Chapter 3 - Installation 27
- 3.1 Introduction 28
- 3.2 Unpacking 28
- 3.3 Installation 29
- 3.4 V.35 Shunt Procedure 30
- 4.1 Introduction 34
- 4.2 Loading Software 34
- 5.1 Introduction 44
- 5.2 Router Configuration 44
- 5.2.1 Setup Menu 44
- 5.2.2 Protocol Stacks 45
- 5.2.3 Device Drivers 45
- 5.2.4 Other Setup 46
- 5.2.5 Actions 46
- Add A New Network 49
- Delete a Network 49
- Save Change 49
- IP General Setup 50
- IP RIP= [enabled 50
- Modify a Network 58
- Remote Port Setup 61
- 5.2.10 WAN Port Setup 63
- Connection Method 64
- Terminal Server 64
- WAN General Setup 65
- WAN Message Printing Control 65
- Script Printing 65
- Modem Control 65
- Modem Type 65
- 5.2.11 Frame Relay Setup 66
- Error Threshold (N392) 67
- Monitored Events Count (N393) 67
- Adding a DLCI 69
- Deleting a DLCI 69
- 5.2.13 Applications Setup 71
- Enable TFTP Server 72
- Enable =[enable I disabled] 73
- Default Logon Screen 73
- 5.2.14 Filtering 74
- ICMP Filtering 77
- IPX Filtering 77
- Default Action 77
- Filtering Entries List 78
- 5.2.15 Diagnostics 80
- EtherNet Port Test 81
- WAN Port Test 81
- WAN Link Test 81
- 5.3 Download Default Setup 82
- 5.4 Download Firmware Update 84
- 5.5 Configuration Port Setup 86
- 5.6 WAN Device Configuration 88
- 5.7 Remote User Data Base 90
- 5.7.1 Add User 91
- 6.1 Introduction 94
- 6.2 Two RouteFinder 94
- MTASR1-100 Owner’s Manual 140
- 7.1 Introduction 148
- Chapter 8 - Router Management 153
- 8.1 Introduction 154
- 8.2.1 View SNMP Parameters 155
- 8.2.2 Set SNMP Parameters 156
- 8.2.4 Refresh SNMP Object 158
- 8.2.6 Property Sheet 159
- 8.2.8 Agent Name Dialog 159
- 8.2.9 Commands 160
- Window menu commands 161
- 8.3 Telnet Management 162
- 8.3.1 Router Configuration 163
- Router Configuration 164
- Applications 166
- WAN Device Configuration 168
- Remote User Database 168
- 9.1 Introduction 170
- 9.2 Installing MCSI 170
- <Line Type> 178
- <SpecificName> 178
- <GeneralName> 178
- <ServerName> 178
- Software 179
- 10.4 Service 195
- 10.5 The Multi-Tech BBS 195
- 10.5.2 To Download a file 195
- 10.6 About CompuServe 196
- 10.7 About the Internet 196
- Appendixes 197
- Appendix A - Cabling Diagrams 198
- Link Cables 199
- Appendix B - Script Language 200
- Script Language Grammar 201
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