NPT-1020 Installation and Maintenance Manual
Commissioning Tests
ECI Telecom Ltd. Proprietary
6-10
N
OTE
:
Measured latency is for both the forward and return paths. For a single path, the latency is
50% of the measured value.
The latency test is dependent on the throughput results. For example, if 10 Mbps is tested
and the throughput is 4%, the latency test should be for 4 Mbps (2 * VC-12 = 4 Mbps).
Inject traffic according to the assigned bandwidth (VC-12 = 2.048 Mbps).
Table
6-9: Throughput and latency test results
LAN port and speed
64 bytes/
frame
128 bytes/
frame
256 bytes/
frame
512 bytes/
frame
1024 bytes/
frame
1280 bytes/
frame
1518 bytes/
frame
Throughput
Latency
6.4.2
System Recovery and Reset Tests
These tests determine the speed at which a device recovers from a buffer overflow condition or from a
power failure.
To perform system recovery and reset tests:
1.
Create two unprotected Ethernet trails of any rate (for example, 10/100 Mbps) between two NEs.
2.
Connect test equipment to both ports of one NE and connect two ports of the other NE (in the
relevant endpoint ports) through an Ethernet cable.
3.
Configure the test equipment for manual testing according to the port rate and for any frame size.
4.
Power off one of the NEs and verify packet loss in the test equipment.
5.
Turn on the NE, wait five minutes, and verify that the errors in the test equipment have cleared.
6.4.3
Frame Loss Rate Test
This test determines the number of frames that are lost when the system is overloaded.
To perform a frame loss rate test:
1.
Create two unprotected Ethernet trails between two NEs.
2.
Connect test equipment to both ports of one NE and connect two ports of the other NE (in the
relevant endpoint ports) through an Ethernet cable.
3.
Configure the test equipment for RFC-2544 for frame loss measurements. Set to 100%.
The frame loss rate in % is defined according to the following formula:
