Nortel 4500 Series Installation Manual page 45

Figure 6
1000BASE-BX
As shown in the previous figure, the transmit (Tx) and receive (Rx) paths
share the same fiber by using two different wavelengths. One model
transmits at 1310 nm and receives at 1490 nm, while the mating model
transmits at 1490 nm and receives at 1310 nm. You can only connect a
mating pair.
You can use 1000BASE-BX SFPs to double the number of your fiber links.
For example, if you have 20 installed fiber pairs with 20 conventional ports
connected, you can use 1000BASE-BX SFPs to expand to 40 ports, using
the same fiber.
The long wavelength optical transceivers used in these models provide
variable distance ranges using single mode fiber optic cabling.
The following table describes standards, connectors, cabling, and
distances for the 1000BASE-BX SFP.
Table 19
IEEE 802.3ah 1000BASE-BX10 SFP specifications
Parameter
Connectors
Data rate
Line rate (8B/10B code)
Distance
Wavelength
Link optical power budget
Maximum transmitter and dispersion power
penalty
Transmitter characteristics
Maximum launch power
Minimum launch power
Copyright © 2007-2008 Nortel Networks
.
Specifications
Single-fiber LC
1.0 Gbit/s
1.25 Gbit/s
Up to 10 km
1310 nm and 1490 nm
11.0 dB
3.3 dB
-3.0 dBm
-9.0 dBm
Nortel Ethernet Routing Switch 4500 Series
Installation — SFPs and XFPs
NN47205-301 02.01
20 October 2008
1000BASE-BX DDI SFP specifications 45