100BASE-LX optical Ethernet specification

Overview

The 100BASE-LX PTMs can be used on the VLNC33, VLNC35, VLNC40, VLNC42/42B, VLNC60, VLNC61, VLNC62, and VLNC64 circuit packs.

System specifications

The following are the 100BASE-LX system specifications:

• Optical Line Rate: 125 MBd (±50 ppm)

• Optical Line Coding: 4B/5B

• Fiber Type: 10 μm SMF

• Minimum Range: 2 to 10,000 meters

• Performance: Long-reach

Transmitter specifications

The 100BASE-LX transmitter meets these specifications defined in IEEE 802.3. The table below describes some of the transmit specifications for 100BASE-LX.

Table 10-33: 100BASE-LX transmit specifications

Description	100BASE-LX
Transmitter type	Longwave Laser
Signaling speed (range)	125 MBd (±50 ppm)
Wavelength (range)	1260 to 1360 nm
Maximum RMS Spectral Width (σ)	7.7 nm
Average launch power (max)	−8 dBm
Average launch power (min)	−15 dBm

Receiver specifications

The 100BASE-LX receiver meets these specifications defined in IEEE 802.3. The table below describes some of the receiver specifications for 100BASE-LX.

Table 10-34: 100BASE-LX receive specifications

Description	100BASE-LX
Signaling speed (range)	125 MBd (±50 ppm)
Wavelength (range)	1260 to 1360 nm
Average receive power (max)	−8.0
Receive sensitivity	−25.0 dBm
Return loss (min) 1	12.0 dB

Notes:

1. Refer to the IEEE802.3 standards for more information about return loss (min).

Link budgets

The worst-case power budget and link penalties for a 100BASE-LX channel are shown in the table below.

Table 10-35: 100BASE-LX link budgets and penalties

Parameter	100BASE-LX
Link power budget	10 dB
Operating distance	10,000 m
Allocation for link penalties 1	4.0 dB

Notes:

1. A wavelength of 1270 nm is used to calculate the link penalty allocation.