Cisco Cisco TwinGig Converter Module 白皮書
Once the channels were set up, channel insertion loss and return loss measurements were taken using JDSU MAP 2000
optical measurement equipment. The 40 Gb/s traffic was generated using the IXIA IP tester and was transmitted over the
channel under test in both directions.
optical measurement equipment. The 40 Gb/s traffic was generated using the IXIA IP tester and was transmitted over the
channel under test in both directions.
To qualify the performance of the link, Bit Error Ratio (BER) was measured and a link pass or fail was determined by the
Cisco’s BER threshold of 10
Cisco’s BER threshold of 10
-12
or lower. The total signal transmission time of the 40 Gb/s signal was set to transmit at least
10
14
bits to ensure measurement accuracy. The following section describes in detail the results obtained.
Results
The data transmission results using both the transceivers and the insertion loss of the corresponding channels are
summarized in Table 2. The BER was measured after counting the total number of errors recorded and the path loss was
measured at both 850 nm and 1310 nm.
summarized in Table 2. The BER was measured after counting the total number of errors recorded and the path loss was
measured at both 850 nm and 1310 nm.
Only cases exhibiting error-free transmission over the maximum reach are shown. The results show that error-free
transmission of up to 150 meters with four connections was achieved with OM4 channels in Configuration A. In addition, error
free transmission of up to 240 meters with four connections was achieved with OM4+ channels in Configuration A. Note that
transmission over the equivalent configuration with OM4 is not error free.
transmission of up to 150 meters with four connections was achieved with OM4 channels in Configuration A. In addition, error
free transmission of up to 240 meters with four connections was achieved with OM4+ channels in Configuration A. Note that
transmission over the equivalent configuration with OM4 is not error free.
With Configuration B, where two trunks were concatenated with five connectors, the BiDi transmission achieved 200 meters
over OM4+ fiber — far exceeding the 150-meter specification by Cisco for OM4.
over OM4+ fiber — far exceeding the 150-meter specification by Cisco for OM4.
Conclusions
Extensive tests were carried out using Berk-Tek Leviton Technologies’ channel configurations with Cisco’s BiDi 40G QSFP
transceivers. The results indicate superior error-free transmission performance for both the test cases at distances specified
by Cisco over Berk-Tek Leviton Technologies optical components. The Cisco BiDi link on both the channel configurations
(A and B) resulted in error-free transmission for the specified lengths of 100 meters for OM3 fiber and 150 meters for OM4
fiber. Using the OM4+ channel with GIGAlite-10XB glass, a 240-meter transmission was successfully achieved.
transceivers. The results indicate superior error-free transmission performance for both the test cases at distances specified
by Cisco over Berk-Tek Leviton Technologies optical components. The Cisco BiDi link on both the channel configurations
(A and B) resulted in error-free transmission for the specified lengths of 100 meters for OM3 fiber and 150 meters for OM4
fiber. Using the OM4+ channel with GIGAlite-10XB glass, a 240-meter transmission was successfully achieved.
Released February 2016 B16 5706
Table 2:
Performance of Various Fiber Systems Over Cisco 40 Gb/s BiDi QSFP Links
TEST CONFIGURATION
PRODUCT TYPE
REACH
NUMBER OF
CONNECTORS
TEST RESULTS
Configuration A
OM3
100 m
4
PASS
OM4
150 m
4
PASS
OM4+
240 m
4
PASS
Configuration B
OM4+
200 m
5
PASS
A P P L I C A T I O N N O T E
( c o n t i n u e d )
BerkTekLevitonTechnologies.com
3