CANOGA PERKINS 9119 Rack Mount 100BASE-TX/FX Media Converter - Manual (Page 19)

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9119 Media Converter Canoga Perkins
3.2.2 100BASE-FX Single Mode (SM) 1310nm LP Laser
The 9119 "1310nm Single Mode" Laser Media Converter features an Average Transmit Power of at least -20dBm, and a
minimum Average Receiver Sensitivity of -31dBm. Allowing for a Transmission Penalty of 1dB, this yields a typical loss
budget of 10dB, per ANSI X3.184.
When working out the cable and circuit attenuation, the user should allow 0.5dB loss per connector for all devices and patch
panel connections, plus 0.5dB loss per km on 8-10/125 micron cable. For a more precise treatment of Cable Plant issues, the
reader is referred to Annex C of ANSI X3.184, "Cable Plant Usage."
3.2.3 100BASE-FX Single Mode (SM) 1310nm LD Laser
The 9119 "1310nm Long Distance Single Mode" Media Converter features an Average Transmit power of at least -4dBm, and
a minimum Average Receiver Sensitivity of -31dBm. Allowing for a Transmission Penalty of 1dB, this yields a loss budget of
26dB, which is much more conservative than that specified in ANSI X3.184 (SMF/PMD Category II).
This is because the ANSI specification references a bit error rate of 2.5 x 10 -10 which is too large to be of practical use at
100Mbps. For this reason, Canoga Perkins prefers to specify the same sensitivity as Category I interfaces. Typically, perfor-
mance will be at least 2dB better than specified. Also, per this ANSI specification, a minimum attenuation of 15dB is
required between transmitter and receiver to prevent overdriving the receiver. This interface option is not recommended for
Half-Duplex (CSMA/CD) applications, due to the minimum attenuation required.
When working out the cable and circuit attenuation, the user should allow 0.5dB loss per connector for all devices and patch
panel connections, plus 0.5dB loss per km on 8-10/125 micron cable. For a more precise treatment of Cable Plant issues, the
reader is referred to Annex C of ANSI X3.184, "Cable Plant Usage." Mixing Category I and Extended Media Converters at
either end of a fiber optic cable is not recommended, since the different driver powers and receiver specifications would
limit the link to fall within a minimum of 14dB attenuation and a maximum of 16dB to assure proper operation, assuming
equal length fibers.
3.2.4 100BASE-FX Single Mode (SM) 1550nm XD Laser
The 9119 "1550nm Long Distance Single Mode" Media Converter features an Average Transmit power of at least -4dBm, and
a minimum Average Receiver Sensitivity of -31dBm. Allowing for a Transmission Penalty of 1dB, this yields a loss budget of
26dB, which is much more conservative than that specified in ANSI X3.184 (SMF/PMD Category II).
This is because the ANSI specification references a bit error rate of 2.5 x 10 -10 which is too large to be of practical use at
100Mbps. For this reason, Canoga Perkins prefers to specify the same sensitivity as Category I interfaces. Typically, perfor-
mance will be at least 2dB better than specified. Also, per this ANSI specification, a minimum attenuation of 15dB is
required between transmitter and receiver to prevent overdriving the receiver. This interface option is not recommended for
Half-Duplex (CSMA/CD) applications, due to the minimum attenuation required.
When working out the cable and circuit attenuation, the user should allow 0.5dB loss per connector for all devices and patch
panel connections, plus 0.5dB loss per km on 8-10/125 micron cable. For a more precise treatment of Cable Plant issues, the
reader is referred to Annex C of ANSI X3.184, "Cable Plant Usage." Mixing Category I and Extended Media Converters at
either end of a fiber optic cable is not recommended, since the different driver powers and receiver specifications would
limit the link to fall within a minimum of 14dB attenuation and a maximum of 16dB to assure proper operation, assuming
equal length fibers.