Spirent SmartBits System, Reference Manual

Page: 66 / 278

Chapter 6: Optional Applications
SmartxDSL
58 SmartBits System Reference
Table 6-5. SmartxDSL Tests and Description
Tests Description
Frame Loss Indicates the performance of the DUT under a given
load, by measuring the percentage of frames that are
not forwarded due to lack of resources (as per RFC-
1242), in the upstream, downstream, or bi-directional
test modes.
Frame Latency Measures the latency of each test frame per VPI/VCI
per port. The test operates in upstream or downstream
test modes.
Stability Over Time Measures the frame loss or percentage of line capacity
per VPI/VCI over a prolonged period (up to one week)
with sampling resolution ranging from a few seconds to
an hour. Each sample is time-stamped in order to help
the user to determine correlation with external events
and to detect the failed VPI/VCI pairs. The test operates
in upstream, downstream, or bi-directional test modes.
End-to-End IP Measures the speed and capacity of the DUT to forward
IP traffic between two or more end points. This test
assumes the use of Ethernet SmartCards on the trunk
side of the network as well as the use of an external
router if the DSLAM does not have embedded routing
functions. The test operates in upstream, downstream,
and bi-directional test modes. You can perform any of
the following six measurements:
•
Sequence Tracking
•
Latency per Stream
•
Latency Distribution
•
Latency over Time
•
Se Latency
Cell Loss This test measures loss of ATM cells. In this test each
frame equals one cell in size.The test measures the
difference between frames transmitted and frames
received. This test is applicable only to ATM end-to-
end operation, and operates in upstream, downstream,
and bi-directional test modes.