.
IBM42M10SCYAA10
IBM42M10LCYAA20
1063Mb/s Gigabit Link Module
Features
• 1063Mb/s data rate
• Low bit error rate (<10-12
)
• Short wavelength (SW; distance ≤ 500m), long
wavelength (LW; distance ≤ 10km), and custom
versions available
• High reliability (AFR <0.0195%/khr, over 44
khours)
• (ANSI) Fibre Channel compatible [1]
Applications
• FCSI-301-Revision 1.0 compatible (Gigabaud
Link Module [2])
• Fibre Channel
• Client/Server environments
• Distributed multi-processing
• Fault tolerant applications
• Visualization, real-time video, collaboration
• Channel extenders, data storage, archiving
• Data acquisition
• 20-bit electrical interface
• Parallel electrical ⇔ light conversion
• Clock and data recovery
• Serialization/deserialization
• International Class 1 laser safety certified
• UL & CSA approved
Overview
IBM42M10SCYAA10 and IBM42M10LCYAA20 are
1063Mb/s Gigabit Link Modules (GLMs). These
highly integrated fiber optic transceivers provide
high-speed serial links at a signaling rate of
The IBM42M10LCYAA20 uses long wavelength
(1300nm) lasers. This enables data transmission
over optical fibers at distances up to 10km on a
single mode (9/125µm) optical fiber.
1062.5Mbit/s, which equates to 100 Mbytes/s of
continuous throughput simultaneously in each direc-
tion. The IBM42M10SCYAA10 conforms to the
American National Standards Institute’s (ANSI)
Fibre Channel, FC-0 specification for short wave-
length operation (100-M5-SL-I and 100-M6-SL-I) [1].
The IBM42M10LCYAA20 conforms to the ANSI FC-
0 specification for longwave operation (100-SM-LL-
I). These modules can also be used for other serial
applications where high data rates are required.
These compact, double-sided, surface mount
modules are designed to easily connect to a user’s
system card. Data and control lines conform to
industry standard TTL interface levels.
Twenty bit, encoded, transmit data is received, seri-
alized at 1062.5 Mbaud, and modulated on the
laser. The 20-bit data must be encoded using the
8B/10B encoding [3, 4] scheme specified by the
Fibre Channel standard.
Incoming, modulated light is received by a photore-
ceiver mounted in the SC receptacle. A phase
locked loop (PLL) recovers the clock and retimes the
serial data which is deserialized into a 20-bit word
and presented to the interface at 53.125MHz.
An Open Fibre Control (OFC) function turns off the
laser if there is no modulated light received by the
photoreceiver. This function guarantees that these
GLMs are Class 1 laser products in the event of an
open link.
The IBM42M10SCYAA10 uses short wavelength
(850nm) VCSEL lasers. This enables low cost data
transmission over optical fibers at distances up to
500m. A 50/125µm multimode optical fiber, termi-
nated with an industry standard SC connector, is the
preferred media. A 62.5/125mm multimode fiber can
be substituted with shorter maximum link distances.
As specified in the GLM document, the
IBM42M10LCYAA20 uses Open Fibre Control Laser
Safety protection techniques rather than the phys-
ical shutters specified by Fibre Channel. The timings
are the same as those used with the GLM-266 short
wavelength links.
glm1063.02.fm.02
Feb. 15, 2000
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