1000BASE-LX optical Ethernet/SAN specification

Overview

The 1000BASE-LX PTMs can be used for GbE, 1Gbps and 2 Gbps Fibre-Channel, and FICON service over Single-Mode Fiber (SMF).

System specifications

The following are the 1000BASE-LX system specifications:

• Optical Line Rate: 1.25 GBd (±100 ppm)

• Optical Line Coding: 8B/10B

• Fiber Type: 10 μm SMF

• Minimum Range: 2 to 10,000

• Performance: long-reach

GbE/FC/2XFC/FICON compliance

The PTM optics are compliant with GbE and compatible with FC, 2XFC, and FICON specifications.

Transmitter specifications

The optical 1000BASE-LX optical transmitter meets the specifications defined in IEEE802.3. The table below shows some of the 1000BASE-LX optical transmitter specifications. The 1000BASE-LX transceiver also meets ANSI INCITS FC-PI standards for FC and 2xFC traffic (352-2002).

Table 10-83: 1000BASE-LX transmit specifications

Description	1000BASE-LX
Transmitter type	Longwave Laser
Signaling speed (range)	1.25 GBd (±100 ppm)
Wavelength (λ, range)	1270 to 1355 nm
Trise/Tfall (max; 20%−80% response time)	0.26 ns
Maximum RMS Spectral Width (σ)	4.0 nm
Average launch power (max)	−3.0 dBm
Average launch power (min)	−11.0 dBm
Average launch power of OFF transmitter (max)	−30.0 dBm
RIN (max)	−120 dB/Hz

Receiver specifications

The 1000BASE-LX receiver meets the specifications defined in IEEE 802.3. The table below shows some of the 1000BASE-LX optical receiver specifications.

Table 10-84: 1000BASE-LX receive specifications

Description	1000BASE-LX
Signaling speed (range)	1.25 GBd (±100 ppm)
Wavelength (range)	1270 to 1355 nm
Average receive power (max)	−3.0 dBm
Receive sensitivity	−19.0 dBm
Return loss (min) 1	12.0 dB
Receive electrical 3 dB upper cutoff frequency (max)	1500 MHz

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 1000BASE-LX channel are shown in the table below.

Table 10-85: 1000BASE-LX link budgets and penalties

Parameter	1000BASE-LX
Link power budget	8.0 dB
Operating distance	10,000 m
Allocation for link penalties 1	2.0 dB

Notes:

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

Format specification

The 1000BASE-LX Ethernet/SAN interface complies with the following formatting standards:

• Maximum frame size see Packet size in different tagging modes

• 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 1000BASE-LX interface. A detailed list of monitored parameters can be found in Performance monitoring.