SFP28 Series

EOLP-1325G-10-RX
1310nm SFP28 Single-Mode Transceiver, With DDM and Dual CDR
Duplex SFP28 Transceiver, RoHS Compliant

Features
 Operating data rate support 24.33Gbps and 25.78Gbps
with CDR engaged mode

 Operating data rate support 9.95Gbps and 10.31Gbps

with CDR bypassed mode

 1310nm DFB-LD Transmitter

 Distance up to 10km

 Single 3.3V Power supply

 Duplex LC Connector Interface, Hot Pluggable

 Built-in dual CDR

Applications
 Compliant with MSA SFP+ Specification SFF-8402
 CPRI Option 10
 Power Dissipation < 1.2W(Standard)
 25GbE
 Power Dissipation < 1.5W(Industrial)
 10GbE Optical Link
 Operating Case Temperature:

Standard: 0℃~+70℃

Industrial: -40℃~+85℃

 Safety Certification: TUV/UL/FDA*Note1

 RoHS Compliant

Ordering information
Data Fiber
Part No. Laser Distance Temp. CDR DDMI
Rate Type
24.33Gbps
1310nm 0℃
EOLP-1325G-10-R*Note2 and SMF 10km Yes Yes
DFB ~+70℃
25.78Gbps
24.33Gbps
1310nm -40℃
EOLP-1325G-10-RI*Note3 and SMF 10km Yes Yes
DFB ~+85℃
25.78Gbps
Note1: For the latest certification information, please check with Eoptolink.
Note2: Standard version
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 SFP28 Series
Note3: Industrial version
*The product image only for reference purpose.

Product Description
The EOLP-1325G-10-RX series single-mode transceiver is SFP28 module for duplex optical data

communications support 24.33Gb/s and 25.78Gb/s with CDR engaged, while, 10G Ethernet optical

data communication can be supported when CDR is bypassed. It is with the SFP+ 20-pin

connector to allow hot plug capability. Digital diagnostic functions are available via an I2C. It has

built-in clock and data recovery (CDR). This module is designed for single-mode fiber and operates

at a nominal wavelength of 1310nm.

The transmitter section uses a 1310nm multiple quantum well DFB laser and is a class 1 laser

compliant according to International Safety Standard IEC 60825. The receiver section uses an

integrated InGaAs detector preamplifier (IDP) mounted in an optical header and a limiting

post-amplifier IC.

Absolute Maximum Ratings*Note4

Parameter Symbol Min. Max. Unit
Storage Temperature TS -45 +100 °C
Supply Voltage VCC -0.5 4.0 V
Operating Relative Humidity RH 5 95 %
Note4: Exceeding any one of these values may destroy the device permanently.

Recommended Operating Conditions

Parameter Symbol Min. Typical Max. Unit
Operating Case Standard 0 70 °C
TC
Temperature Industrial -40 85 °C
Power Supply Voltage VCC 3.135 3.465 V
Standard 360 mA
Power Supply Current ICC
Industrial 455 mA

Performance Specifications – Electrical

Parameter Symbol Min. Typ. Max Unit Notes
Transmitter
CML AC coupled
Vin 200 900 mVpp
Inputs(Differential) inputs
Input Impedance Connected
Zin 100 ohms
(Differential) directly to TX pins

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 SFP28 Series
Tx_DISABLE Input
2 Vcc+0.3 V
Voltage – High
Tx_DISABLE Input
-0.3 0.8 V
Voltage – Low
Receiver
CML Outputs AC coupled
Vout 300 1000 mVpp
(Differential) outputs
Rx_LOS Output
2 Vcc+0.3 V
Voltage – High
Rx_LOS Output
-0.3 0.8 V
Voltage – Low

Optical and Electrical Characteristics

Parameter Symbol Min. Typical Max. Unit
9um Core Diameter SMF 10 km
Transmitter
Centre Wavelength λC 1295 1310 1325 nm
Spectral Width (-20dB) ∆λ 1 nm
Average Output Power@25.78Gb/s Pout -7 2 dBm
Extinction Ratio ER 3 dB
Transmitter Dispersion Penalty TDP 2.7 dB
Receiver
Centre Wavelength λC 1260 1310 1355 nm
Receiver Sensitivity(OMA)*Note5 RxOMA -12 dBm
Stressed Receiver Sensitivity(OMA)*Note5 RxSRS -9.5 dBm
Receiver Overload Pmax 2 dBm
Receiver Reflectance -26 dB
LOS De-Assert LOSD -17 dBm
LOS Assert LOSA -30 dBm
LOS Hysteresis HY 0.5 dB
Note5: Measured with data rate at 25.78Gb/s, BER less than 5E-5 with PRBS 231-1.

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SFP28 Transceiver Electrical Pad Layout

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Pin Function Definitions
Pin Plug
Name Function Notes
Num. Seq.
1 VeeT Transmitter Ground 1 Note 5
Transmitter Fault
2 TX Fault 3 Note 1
Indication
3 TX Disable Transmitter Disable 3 Note 2, Module disables on high or open
4 SDA Module Definition 2 3 Data line for Serial ID.
5 SCL Module Definition 1 3 Clock line for Serial ID.
6 MOD-ABS Module Definition 0 3 Note 3
Rate Select 0, optionally controls SFP28
RX Rate Select
7 RS0 3 module receiver. This pin is pulled low to
(LVTTL).
VeeT with a >30K resistor.
8 RX LOS Loss of Signal 3 Note 4
Rate Select 1, optionally controls SFP28
TX Rate Select
9 RS1 1 module transmitter. This pin is pulled low to
(LVTTL).
VeeT with a >30K resistor.
10 VeeR Receiver Ground 1 Note 5
11 VeeR Receiver Ground 1 Note 5
Inv. Received Data
12 RD- 3 Note 6
Out
13 RD+ Received Data Out 3 Note 6
14 VeeR Receiver Ground 1 Note 5
15 VccR Receiver Power 2 3.3V ± 5%, Note 7
16 VccT Transmitter Power 2 3.3V ± 5%, Note 7
17 VeeT Transmitter Ground 1 Note 5
18 TD+ Transmit Data In 3 Note 8
Inv. Transmit Data
19 TD- 3 Note 8
In
20 VeeT Transmitter Ground 1 Note 5

Notes:
1) TX Fault is an open collector/drain output, which should be pulled up with a 4.7K – 10KΩ resistor
on the host board. Pull up voltage between 2.4V and VccT/R+0.3V. When high, output indicates a
laser fault of some kind. Low indicates normal operation. In the low state, the output will be pulled
to < 0.4V.

2) TX disable is an input that is used to shut down the transmitter optical output. It is pulled up
within the module with a 4.7K~10 K Ω resistor. Its states are:
Low (-0.3 – 0.8V): Transmitter on
(>0.8, < 2.0V): Undefined
High (2.0 – VccT/R+0.3V): Transmitter Disabled

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 SFP28 Series
Open: Transmitter Disabled

3) Module Absent, connected to VeeT or VeeR in the module.

4) RX LOS (Loss of Signal) is an open collector/drain output, which should be pulled up with a 4.7K
– 10KΩ resistor. Pull up voltage between 2.4V and VccT/R+0.3V. When high, this output indicates
the received optical power is below the worst-case receiver sensitivity (as defined by the standard
in use). Low indicates normal operation. In the low state, the output will be pulled to < 0.4V.

5) VeeR and VeeT may be internally connected within the SFP28 module.

6) RD-/+: These are the differential receiver outputs. They are AC coupled 100Ω differential lines
which should be terminated with 100Ω (differential) at the user SERDES. The AC coupling is done
inside the module and is thus not required on the host board. The voltage swing on these lines will
be between 150 mV-500mV single-ended when properly terminated.

7) VccR and VccT are the receiver and transmitter power supplies. They are defined as 3.3V ±5%
at the SFP+ connector pin. Maximum supply current is 455mA. Inductors with DC resistance of less
than 1 ohm should be used in order to maintain the required voltage at the SFP28 input pin with
3.3V supply voltage. When the recommended supply-filtering network is used, hot plugging of the
SFP28 transceiver module will result in an inrush current of no more than 30mA greater than the
steady state value. VccR and VccT may be internally connected within the SFP28 transceiver
module.

8) TD-/+: These are the differential transmitter inputs. They are AC-coupled, differential lines with
100Ω differential termination inside the module. The AC coupling is done inside the module and is
thus not required on the host board. The inputs will accept swings of 90mV-800mV single-ended,
though it is recommended that values between 100mV-450mV single-ended be used for best EMI
performance.

EEPROM
The serial interface uses the 2-wire serial CMOS EEPROM protocol. When the serial protocol is
activated, the host generates the serial clock signal (SCL). The positive edge clocks data into those
segments of the EEPROM that are not writing protected within the SFP28 transceiver. The
negative edge clocks data from the SFP28 transceiver. The serial data signal (SDA) is
bi-directional for serial data transfer. The host uses SDA in conjunction with SCL to mark the start
and end of serial protocol activation. The memories are organized as a series of 8-bit data words
that can be addressed individually or sequentially.

The Module provides diagnostic information about the present operating conditions. The
transceiver generates this diagnostic data by digitization of internal analog signals. Calibration and
alarm/warning threshold data is written during device manufacture. Received power monitoring,
transmitted power monitoring, bias current monitoring, supply voltage monitoring and temperature
monitoring all are implemented. If the module is defined as external calibrated, the diagnostic data
are raw A/D values and must be converted to real world units using calibration constants stored in
EEPROM locations 56 – 95 at wire serial bus address A2H. The digital diagnostic memory map
specific data field define as following .For detail EEPROM information, please refer to the related
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 SFP28 Series
document of SFF 8472 Rev 12.2.

EEPROM Serial ID Memory Contents (2-Wire Address A0h)

EEPROM Address A0h Version V1.0

Data Field Size
Name Of filed Description of field Coded value Hex
Addr (Byte)
BASE ID FIELDS
0 1 Identifier Type of serial transceiver SFP28 03
Extended identifier of Type
1 1 Ext.Identifier MOD4 04
of serial transceiver
2 1 Connector Code for connector type LC 07
10G Ethernet Compliance
3 Codes & Infiniband 00
Compliance Codes
Part of SONET
4 00
Compliance Codes
SONET Compliance
5 00
Codes
Ethernet Compliance
6 00
8 Transceiver Codes
Fiber Channel link length &
7 part of Fibre Channel 00
technology
Part of Fiber Channel
8 00
transmitter technology
Fiber Channel
9 00
Transmission media
10 Fiber Channel speed 00
11 1 Encoding Code for high speed serial 64B/66B 06

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encoding algorithm
Nominal signalling rate,
units of 100MBd.(see
12 1 BR, Nominal 25.78Gbps FF
details for rates >
25.0Gb/s)
Type of rate select
13 1 Rate Identifier 00
functionality
Link length supported for
14 1 Length(SMF,km) single mode fiber, units of 10(km) 0A
km
Link length supported for
15 1 Length (SMF) single mode fiber, units of 100(100m) 64
100 m
Link length supported for
16 1 Length (50um) 50 um OM2 fiber, units of 00
10 m
Link length supported for
17 1 Length (62.5um) 62.5 um OM1 fiber, units of 00
10 m
Link length supported for
50um OM4 fiber, units of
Length (OM4 or 10m.
18 1 00
copper cable) Alternatively copper or
direct attach cable, units of
m
Link length supported for
19 1 Length (OM3) 50 um OM3 fiber, units of 00
10 m
20 E 45
21 o 6F
22 p 70
23 t 74
24 o 6F
25 l 6C
26 i 69
27 16 Vendor name Vendor name (ASCII) n 6E
28 k 6B
29 <space> 20
30 <space> 20
31 <space> 20
32 <space> 20
33 <space> 20
34 <space> 20
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 SFP28 Series
35 <space> 20
Code for electronic or
36 1 Transceiver 25GBASE-LR 03
optical compatibility
37 00
SFP vendor IEEE
38 3 Vendor OUI 00
company ID
39 00
40 E 45
41 O 4F
42 L 4C
43 P 50
44 - 2D
45 1 31
46 3 33
47 Part number provided by 2 32
16 Vendor PN
48 vendor (ASCII) 5 35
49 G 47
50 - 2D
51 1 31
52 0 30
53 - 2D
54 R 52
55 <space> / I 20/49
56 1 31
Revision level for part
57 . 2E
4 Vendor rev number provided by
58 0 30
vendor (ASCII)
59 <space> 20
60 05
2 Wavelength Laser Wavelength 1310nm
61 1E
62 1 Reserved 00
Check code for Base ID
63 1 CC_BASE 87/B0
Fields (addresses 0 to 62)
CDR indicator;power
Level
64 0A
Declaration:power
Indicates which optional
level 2
2 Options transceiver signals are
RATE_SELECT，
implemented
TX_DISABLE,
65 3A
TX_FAULT
signal,Rx_LOS
Nominal bit rate per
66 1 BR, max channel,units of 250 Mbps. 25.78Gbps 67
Complements Byte 12

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Lower bit rate margin, units
67 1 BR, min of %(see details for rates > 00
25.0Gb/s)
68 x xx
69 x xx
70 x xx
71 x xx
72 x xx
73 x xx
74 x xx
75 Serial number provided by x xx
16 Vendor SN
76 vendor (ASCII) x xx
77 x xx
78 <space> 20
79 <space> 20
80 <space> 20
81 <space> 20
82 <space> 20
83 <space> 20
84 Year x
85 Year x
86 Month x
87 Vendor’s manufacturing Month x
8 Date code
88 date code Day x
89 Day x
90 <Space> 20
91 <Space> 20
DD Implemented;
Diagnostic Type of diagnostic
92 1 Internally Calibrated; 68
Monitoring Type monitoring is implemented
Average Power
Optional
Alarm/warning Flags
Implemented,Optional
soft
Optional enhanced TX_DISABLE,Optional
93 1 Enhanced Options F8
features are implemented soft TX_FAULT
monitoring,Optional
soft RX_LOS,Optional
soft RATE_SELECT
monitoring
SFF-8472 Revision of SFF-8472 the
94 1 Rev 12.0 of SFF-8472. 08
Compliance transceiver complies with
95 1 CC_EXT Check code for the Note 5 xx
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Extended ID Fields
(addresses 64 to 94)
Note 5: The check code shall be the low order 8 bits of the sum of the contents of all the bytes from byte
64 to byte 94, inclusive.

Operation about Retimer/CDR Rate Select Logic

The EOLP-1325G-10-RX supports high data rates 24.33G/25.78G(CPRI options 10 /25GbE) and
Low data rates 9.95G/10.31G(10GbE-LW/LR). For more details, please contact Eoptolink.
Logic OR of Logic OR of
RS0 Pin and RS1 Pin and RX TX Status of Status of
Bit110.3 of Bit118.3 of Data Rate Data Rate RX CDR TX CDR
A2H A2H
24.33G/25.78 24.33G/25.78 CDR CDR
High/1 High/1
G G Engaged Engaged
24.33G/25.78 CDR CDR
High/1 Low/0 9.95G/10.31G
G Engaged Bypassed
24.33G/25.78 CDR CDR
Low/0 High/1 9.95G/10.31G
G Bypassed Engaged
CDR CDR
Low/0 Low/0 9.95G/10.31G 9.95G/10.31G
Bypassed Bypassed

Mechanical Specifications*
For detail mechanical information, please refer to the related document of SFF-8432.

*This 2D drawing only for reference, please check with Eoptolink before ordering.

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 SFP28 Series
Eye Safety

This single-mode transceiver is a Class 1 laser product. It complies with IEC-60825 and FDA 21
CFR 1040.10 and 1040.11. The transceiver must be operated within the specified temperature and
voltage limits. The optical ports of the module shall be terminated with an optical connector or with
a dust plug.

Obtaining Document
You can visit our website: http://www.eoptolink.com
Or contact Eoptolink Technology Inc., Ltd. Listed at the end of the documentation to get the latest
documents.

Revision History
Release
Revision Initiate Review Approve Revision History
Date
Airon/
Picard/Kelly/ Aug 04,
V1.a Yi.Wan/ Preliminary
Young/Roty 2016
Angela
Roty/ Update the mechanical Dec 28,
V1.b Airon/Picard
William structure 2016
Picard/Roty/
Add/update information about Feb 20,
V1.c Airon Kelly/Yi.Wan/
Industrial module 2017
Dawn
Picard/Airon/ Correct the industrial Mar 17,
V1.d Roty
Kelly temperature 2017
Update the module picture and
Change the industrial Laser
type, power dissipation,Update Sep 19,
V1.e Roty Chao.Wang
the 2D drawing,the address 2017
and the contact
information,update A0h
Update the Optical and
Electrical Characteristics
Airon/Marvin/ Dec 06,
V1.f Roty compliant with IEEE
Yiwan 2017
P802.3cc-2017，add the
RATE_SELECT in EEPROM
Add RxOMA, RxSRS
Airon/Marvin/ compliant with IEEE Jun 05,
V1.g Roty
Nico/Kelly P802.3cc/D3.0, Update the 2D 2018
drawing.
Airon/Marvin/ Add Rate Select operation, Jul 28,
V2.a Roty
Nico/Kelly/ Update the Optical 2018

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 SFP28 Series
John/Flagon/ characteristics based on IEEE
Xavier Std 802.3cc-2017
Kelly/ Updated the regulatory Dec 18,
V2.b Angela
Yiwei.Cheng compliance information. 2018

Notice:
Eoptolink reserves the right to make changes to or discontinue any optical link product or service

identified in this publication, without notice, in order to improve design and/or performance.

Applications that are described herein for any of the optical link products are for illustrative

purposes only. Eoptolink makes no representation or warranty that such applications will be

suitable for the specified use without further testing or modification.

Contact:
Add: No.127 West Wulian Street, Gongxing Town, Shuangliu district, Chengdu City, Sichuan,

China.

Tel: (+86) 028-67087999

Fax: (+86) 28-67087979-8010

Postal: 610213

E-mail:sales@eoptolink.com

http://www.eoptolink.com

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