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Número de pieza IBM42F21LNNAA10
Descripción (IBM42x21xNNAA10) Fiber Channel Small Form Factor PTH Transceiver
Fabricantes IBM Microelectronics 
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. IBM42G21SNNAA10 IBM42F21SNNAA10
IBM42G21LNNAA10 IBM42F21LNNAA10
2x / 1x Fibre Channel Small Form Factor PTH Transceiver
Features
• International Class 1 laser safety certified
• 1.0625 Gb/s or 2.125 Gb/s data rates
• 1x and 2x (ANSI) Fibre Channel compliant [1]
• Short wavelength (SW) (distance 500 m)
• Long wavelength (LW) (distance 10,000 m)
• Gigabit electrical serial interface
• Low Power Dissipation, 500 mW Typical
• LVTTL Signal-Detect Output
• AC coupling of PECL signals
• Single +3.3 V Power Supply
• Withstand normal wave solder and aqueous
spray cleaning
• UL and CSA approved
• Low bit error rate (< 10-12)
• High reliability AFR < 0.01%/khr@50°C, 100 FIT
Applications
• 2x Gigabit Fibre Channel
• Gigabit Fibre Channel
• Client/Server environments
• Distributed multi-processing
• Fault tolerant applications
• Visualization, real-time video, collaboration
• Channel extenders, data storage, archiving
• Data acquisition
Description
The 1.0625/2.125Gbps Small Form Factor (SFF-
PTH-SW/LW-2X5/2X6) is an integrated fiber optic
transceiver that provides a high-speed serial link at
a signaling rate up to 2.125Gb/s. The SFF-PTH-
SW/LW-2X5/2X6 conforms to the American National
Standards Institute’s (ANSI) Fibre Channel, FC-PI
specification for short and long wavelength opera-
tion (200-M5-SN-I, 200-M6-SN-I,100-M5-SN-I,100-
M6-SN-I, 200-SM-LC-L, and 100-SM-LC-L).
The transceiver is insensitive to the data rate of the
incoming electrical and optical signals. The trans-
ceiver complies with the 1.0625Gb/s Fibre Channel
specification and 2.125Gb/s FC Standard without an
external control signal.
The SFF-PTH-SW/LW-2X5/2X6 is ideally suited for
Fibre Channel applications which include point to
point links as well as Fibre Channel Arbitrated Loop
(FC-AL). It can also be used for other serial applica-
tions where high data rates are required. This speci-
fication applies to a pin through hole (PTH) module
which has a 2 by 5 electrical connector pin configu-
ration.
The SFF-PTH-2125-SW uses a short wavelength
(850nm) VCSEL (Vertical Cavity Surface Emitting
Laser) source. This enables low cost data transmis-
sion over optical fibers at distances up to 500m at
1.0625Gb/s and 300m at 2.125Gb/s. A 50/125µm
multimode optical fiber, terminated with an industry
standard LC connector, is the preferred medium. (A
62.5/125µm multimode fiber can be substituted with
shorter maximum link distances.)
The SFF-PTH-LW uses a long wavelength
(1310nm) edge emitting laser. This enables data
transmission over optical fibers at distances up to
10,000 m on a single mode (9/125µm) optical fiber.
Encoded (8B/10B) [3], [4], gigabit/sec serial differen-
tial PECL signals traverse a PTH connector interfac-
ing the SFF-PTH-SW/LW-2X5/2X6 to the host card.
The serial data modulates the laser and is sent out
over the outgoing fiber of a duplex cable.
Incoming modulated light is detected by a photore-
ceiver mounted in the LC receptacle. The optical
signal is converted to an electrical one, amplified
and delivered to the host card. This module is
designed to work with industry standard “10b” Seri-
alizer/Deserializer modules.
The SFF-PTH-SW/LW-2X5/2X6 is a Class 1 laser
safe product. The optical power levels, under normal
operation, are at eye safe levels. Optical fiber cables
can be connected and disconnected without shut-
ting off the laser transmitter.
03/14/01
Page 1 of 23

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IBM42F21LNNAA10 pdf
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IBM42G21SNNAA10 IBM42F21SNNAA10
IBM42G21LNNAA10 IBM42F21LNNAA10
2x / 1x Fibre Channel Small Form Factor PTH Transceiver
Output Signal Definitions
Levels for the signals described in this section are listed in Receive Signal Interface on page 8 and Control
Electrical Interface on page 9.
Rx_DAT
The incoming optical signal is converted and repowered as a differential PECL serial data stream. The
Receive Signal Interface table on page 8 gives the voltage levels and timing characteristics for the Rx_DAT
signals.
Rx_SD
The Receive Signal Detect line is high (a logical one) when the incoming modulated light intensity is sufficient
for reliable operation. This is the state for normal operation. The line is low (a logical zero) when incoming
modulated light intensity is the below that required to guarantee the correct operation of the link. Normally,
this only occurs when either the link is unplugged or the companion transceiver is turned off. This signal is
normally used by the system for diagnostic purposes.
This signal has a push-pull output driver.
Tx_Fault (Only available on 2 X 6)
Upon sensing an improper power level in the laser driver, the SFF sets this signal high and turns off the laser.
The Tx_Fault signal can be reset with the Tx_Disable line.
The laser is turned off within 100 µs as shown in the Transmitter Fault Detection timing diagram below.
This signal has an open drain TTL driver. A pull up resistor is required on the host side of the SFF connector.
The recommended value for this resistor is 10 k.
Receive Signal Detection
Optical Signal
Signal Removed
Rx_SD
t_SD_off
<100µs
t_SD_on
<100µs
Transmitter Fault Detection
transmitter
safety fault
Tx_Fault
Optical
Power
t_fault
Tx_Fault option is only available on 2 X 6 <100µs
03/14/01
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IBM42G21SNNAA10 IBM42F21SNNAA10
IBM42G21LNNAA10 IBM42F21LNNAA10
2x / 1x Fibre Channel Small Form Factor PTH Transceiver
Transmitter Specifications
Symbol
λC
∆λ
PT
Trise/Tfall
OMA
OMA
RIN12
DJ
CPR
Parameter
Spectral Center Wavelength
Spectral Width
Launched Optical Power
Optical Rise/Fall Time
Optical Modulation Amplitude (2.125Gb/s)
Optical Modulation Amplitude (1.0625Gb/s)
Relative Intensity Noise
Eye Opening
Deterministic Jitter
Coupled Power Ratio
Min
830
-10
196
156
0.56
9
Typical
Max.
860
0.85
-4.0
150
-117
0.26
Unit
nm
nm (rms)
dBm (avg)
ps
µW (pk-pk)
µW (pk-pk)
dB/Hz
UI
UI
dB
Notes
1
2
3
3
4
5
6
7
1. Launched optical power is measured at the end of a two meter section of a 50/125m fiber (N.A.=0.20). The maximum and mini-
mum of the allowed range of average transmitter power coupled into the fiber are worst case values to account for manufacturing
variances, drift due to temperature variations, and aging effects. The minimum launched optical power specified assumes an infi-
nite extinction ratio at the minimum specified OMA.
2. Optical transition time is the time interval required for the rising or falling edge of an optical pulse to transition between the 20% and
80% amplitudes relative to the logical 1 and 0 levels. This is measured through a 4th order Bessel -Thompson filter with 0.75 * Data
Rate 3-dB bandwidth and corrected to the full bandwidth value.
3. Optical Modulation Amplitude (OMA) is defined as the difference in optical power between a logic level one and a logic level zero.
The Optical Modulation Amplitude is defined in terms of average optical power (PAVG in µW) and extinction ratio (ER) as given by
OMA=2PAVG((ER-1)/(ER+1)). In this expression, the extinction ratio, the ratio of the average optical power (in µW) in a logic level
one to the average optical power in a logic level zero measured under fully modulated conditions in the presence of worst case
reflections, must be the absolute (unitless linear) ratio and not expressed in dB. The specified Optical Modulation Amplitude is
equivalent to an average power of -9 dBm at an extinction ratio of 9 dB.
4. RIN12 is the laser noise, integrated over a specified bandwidth, measured relative to average optical power with 12dB return loss.
See ANSI Fibre Channel Specification Annex A.
5. Eye opening is the portion of the bit time where the bit error rate (BER) 10-12. 1.0625Gb/s values meet the criteria listed in Ref
[1].
6. Deterministic Jitter is measured as the peak-to-peak timing variation of the 50% optical signal crossings when transmitting repeti-
tive K28.5 characters. It is defined in FC-PH, version 4.3, clause 3.1.87 as:
Timing distortions caused by normal circuit effects in the transmission system. Deterministic jitter is often subdivided into
duty cycle distortion (DCD) caused by propagation differences between the two transitions of a signal and data depen-
dent jitter (DDJ) caused by the interaction of the limited bandwidth of the transmission system components and the sym-
bol sequence. 1.0625Gb/s values meet the criteria listed in Ref [1].
7. Coupled Power Ratio is the ratio of the average power coupled into a multimode fiber to the average power coupled into a single
mode fiber. This measurement is defined in EIA/TIA-526-14A.
03/14/01
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