Spirent SmartBits System, Reference Manual

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Chapter 6: Optional Applications
SmartCableModem Test
SmartBits System Reference 65
SmartCableModem Test
SmartCableModemTest (SCMT) allows you to test the performance of cable modem
devices. SCMT allows you to measure the latency, latency variation, and out-of-sequence
frames for cable modem equipment and systems.
The following cards can be tested using the following SmartBits chassis:
•
SMB-200/2000:
– L3-6710, 10 Base-TX, Layer 3
– ML-7710, 10/100 Base-TX, SmartMetrics
– ML-5710, 10 Base Ethernet, USB SmartMetrics
•
SMB-600 and SMB-6000B:
– LAN-3101A, SmartMetrics 10/100, 12-port.
– LAN-3111A, 100 Base-FX Fiber.
Refer to the SmartCableModemTest located at http://www.netcomsystems.com/support/
documentation.asp for a complete description of the tests available. Table 6-10 gives a
brief description of these tests.
VLAN Setup Time Evaluates the ability of the DUT to update the VLAN
configuration.
Table 6-9. VAST Tests and Descriptions (continued)
Tests Description
Table 6-10. SCMT Tests and Descriptions
Test Description
Sequence Tracking Sequence tracking is on a per stream (end-user device)
basis. Received data is monitored and a record is kept
of the following:
•
Transmitting port number.
•
Transmitting stream number.
•
Total number of frames received.
•
Number of frames received in sequence.
•
Lagging (extremely late) frames received.
•
Frames expected, but not received.