Table Of Contents
Dual Optical LAN 1000Base-LX, GigE-2-LC
11.1 Module Description
11.1.1 Power Consumption
11.2 External Interface
11.2.1 Connector
11.2.2 Compliance
11.2.3 References
Dual Optical LAN 1000Base-LX, GigE-2-LC
11.1 Module Description
This module contains two Gigabit Ethernet (GE) interfaces that meets the 1000Base-LX specification in IEEE 802.3. This interface is a long haul interface based on single-mode fibre. The physical connector is a LC connector. The module contains no TDM interfaces. See Figure 11-1.
Figure 11-1 Dual Optical LAN 1000BASE-LX, GigE-2-LC Module
11.1.1 Power Consumption
The module power consumption is 11 W.
11.2 External Interface
The interface offered is a Gigabit Ethernet (GE) interface that meets the 1000Base-LX specification in IEEE 802.3. This interface is a optical long haul interface based on single-mode fibre, SMF.
The optical LAN interface for 1000BASE-LX (Gigabit) on the module, uses dual fiber interface LC style connector. With one fiber in each direction, 1310nm wavelength and single mode fiber of type 10/125mm.
11.2.1 Connector
The physical connector is a LC connector, type LC SFF PTH.
Note 
The two RJ-45 connectors on the GigE-2-LC module must not be used.
11.2.2 Compliance
The 1000Base-LX Interface Compliance is described in Table 11-1.
Table 11-1 1000Base-LX Interface Compliance
Standard
|
Comment
|
IEEE 802.3
|
Clause 38, PDM sublayer and baseband medium
Clause 37, Auto negotiation
Clause 36, PCS and PMA sublayer
|
IEC 60825-1
|
Laser safety
|
11.2.2.1 Jitter Optical Interface
Table 11-2 gives the output jitter as specified in the datasheet for the optical transceiver.
Table 11-2 Output Jitter for Optical Transceiver
Transmit Signal Interface (from host to SFF-PTH-1250-LW-2X5)
|
Symbol
|
Parameter
|
Min.
|
Max.
|
Unit
|
Notes
|
DJ elec-xmit
|
PECL Deterministic Jitter (1.0625Gb/s)
|
|
0.12
|
UI
|
1
|
TJ elec-xmt
|
PECL Total Jitter
|
|
0.25
|
UI
|
1
|
1. Deterministic jitter (DJ) and total jitter (TJ) values are measured according to the methods defined in appendix A [1]. [1UI (Unit Interval) = 800ps at 1.25Gb/s, and 1 UI = 941ps at 1.0625Gb/s]. Listed values apply to 1.0625Gb/s, 1.25Gb/s transceivers accept TJ < 0.24 UI.
Table 11-3 gives the input jitter as specified in the datasheet for the optical transceiver.
Table 11-3 Input Jitter for Optical Transceiver
Receive Signal Interface (from SFF-PTH-1250-LW-2X5 to host)
|
Symbol
|
Parameter
|
Min.
|
Max.
|
Unit
|
Notes
|
DJ elec-rcv
|
PECL Deterministic Jitter (1.0625Gb/s)
|
|
0.36
|
UI
|
1
|
TJ elec-rcv
|
PECL Total Jitter
|
|
0.61
|
UI
|
1
|
1. Deterministic jitter (DJ) and total jitter (TJ) values are measured according to the methods defined in appendix A [1]. Jitter values assume worst case input jitter. [1UI (Unit Interval) = 800ps at 1.25Gb/s, and 1UI = 941ps at 1.0625Gb/s]. Listed values apply to 1.0625Gb/s, 1.25Gb/s transceivers have TJ < 0.749 UI.
11.2.3 References
•IEC/IEEE
–IEC 60825-1: Laser safety.
–IEEE 802.3, 1998 Edition: Part 3: Carrier sense multiple access with collision detection (CSMA/CD) access method and physical layer specifications.
–IEEE 802.3z: GE Network Standard.
•ANSI
American National Standards Institute Inc. (ANSI), T11.2/Project 1230/Rev10, Fibre Channel-Methodologies for Jitter Specifications (MJS) Drafts of this standard are available to members of the standards working committee. For further information see the T11.2 website at www.t11.org.
–ANSI/EIA/TIA-455-127-1991 [B8].
–ANSI/EIA-455-95-1986 [B7].
–ANSI/TIA/EIA-526-4A-1997 [B13].
–ANSI X3.230-1994 [B19] (FC-PH), Annex A, A.5, Relative intensity noise (RIN) measuring procedure.
–ANSI X3.230-1994 [B19] (FC-PH), Annex A, A.4.2, Active output interface eye opening measurement.
–ANSI X3.230-1994 [B19] (FC-PH), Annex A, A.4.3,DJ Measurement.
–ANSI/EIA/TIA-526-14A [B14].
