PWRLink II 4800T Optical Transmitter Product Manual Rev A (2/02)
A–1
Appendix A
Technical Specifications
A.1 Link
Performance
Carrier-to-Noise (CNR): Shown in Figure A-1
Carrier-to-CSO: >64 dB
1,2
Carrier-to-CTB: >68 dB
1,2
When the link includes optical splitter loss, add 0.1 dB to CNR for every 1 dB
of splitter loss.
In Figure A-1, CNR and optical fiber loss are plotted against each other for a
transmitter with 76 PAL (System B/G) channels
3,4,5
running.
Figure A-1. PWRLink II 4800T series CNR vs. optical fiber loss
1.
These performances specifications are typical, given for 100% fiber optical links. Subtract 1dB from
CSO and CTB for worst-case performance.
2.
Performance expected at +25˚C. For operation over the entire temperature range, subtract 2dB
from CSO and CTB worst-case performance specifications.
3.
Optical link defined as PWL 4800T series transm 100% fiber link + HRM 3811 optical
receiver.
4.
Specifications for 76 unmodulated System B/G (PAL) channels and 100 MHz digital loading at
-10 dBc down from analog channels.
5.
Typical CNR degeneration of 0.5 dB when digital loading is -6 dB below the analog carriers.