100BASE-LX optical Ethernet specification

Overview

The 100BASE-LX PTMs can be used on the LNW63, LNW64, LNW74, LNW87, and LNW170.

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 m

• Performance: long-reach

Transmitter specifications

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

Table 10-93: 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)	−8.0 dBm
Average launch power (min)	−15.0 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 10-94: 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 dBm
Receive sensitivity	−25.0 dBm
Return loss (min) 1	12.0 dB

Notes:

1. See 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 10-95: 100BASE-LX link budgets and penalties

Parameter	100BASE-LX
Link power budget	10.0 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.

Format specification

The 100BASE-LX Ethernet interface complies with the following formatting standards:

• standard IEEE 802.1Q VLANs

• Ethernet to SONET Mapping, G.7041 (GFP) and G.707 (Virtual Concatenation)

• Protection (SONET and/or 802.1W) and Ethernet Bridging (802.1D)

Performance monitoring

Performance monitoring capabilities are available on the 100BASE-LX interface. A detailed list of monitored parameters can be found in Performance monitoring.