Chapter 7: Sample Test Topologies
Sample Devices and Networks to Test
70 SmartBits System Reference
Sample Devices and Networks to Test
Applications available to set up and test cable modem systems:
• SmartCable Modem Test (SCMT) for pre-canned applications.
• SmartWindow for a customized virtual front panel application.
• SmartLib for a programming library.
Testing Cable Modems
Cable modem testing uses SmartMetrics cards and takes advantage to USB as an emerging
transport media for connecting to broadband access technologies. The ML-5710A is a
SmartMetrics SmartCard that has one 10 Mbps Ethernet (RJ-45) and one USB (series A)
port. The USB port enables you to simulate full-field testing conditions of cable modem
systems.
In addition, an ML-7710 SmartCard is used to capture, count, and compare Ethernet
frames that are reassembled by the Head End router.
Refer to the SmartWindow User Guide, for detailed information regarding applicable tests
and features.
Testing Frame Relay Switches
Applications available to set up and test frame relay switches:
• SmartWindow for a customized virtual front panel application.
• SmartLib for a programming library.
• SmartApplications for automated RFC-1242 testing.
Frame Relay testing uses the WAN SmartCards in the SmartBits 200 or 2000 chassis.
The Frame Relay switch is designed to support data in bursts and at high speeds in a bi-
directional, conversational method of communication. The switch operates primarily on
Layers 1 and 2 of the network model, and works via a virtual circuit connection,inthat
dynamic links act like a pipe for moving traffic.
There are three types of virtual circuits:
• Switched (SVC). The SVC is similar to voice connections made through the
telephone network: when the network receives a connection request, it sets one up,
data is sent, and then the call is terminated.
• Permanent (PVC). The PVC is a point-to-point connection that is similar to a leased
data line. It is dedicated and used over long periods of time.
• Multicast (MVC). The MVC is a connection between groups of users, who can use
both SVCs and PVCs.
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