M2R-25-72-2-TCML - Stratos Lightwave

M2R-25-72-X-TXXL Optical Multi-Rate ATM OC-48 -- +3.3V

Dual SFF Receiver -- 2.488GBaud/155MBaud

1152.01 PRELIMINARY

PRELIMINARY



Features

!155MBaud to 2.488GBaud 231 PRBS Performance

!Interoperable with SONET OC-48 and OC-3 equipment

!TTL Signal Detect Output

!50Ω AC coupled PECL/CML Outputs Option

!Single +3.3V Power Supply

!Wave Solderable / Aqueous Washable

!Class 1 Laser Safety Compliant

PRODUCT OVERVIEW

The M2R-25-72-X-TXXL Dual Small Form Factor (SFF)

optical receivers provide high performance unidirectional

data links for communication over optical fiber. The M2R-

25-72 module is specifically designed to be used in

central office environment and metro applications. Many

of these applications require interoperability with SONET/

SDH protocols. These require 1300nm receivers. These

multi-rate dual receiver modules are designed and tested

to operate at data rate of 2.488GBaud and 155MBaud.

The M2R-25-72 receivers are provided with the LC

receptacle which is compatible with the industry standard

LC connector. These receivers provide double port

densities by fitting twice the number of receivers into the

same board space as a 1x9 module. This saves on

system costs and can reduce overall design time.

This dual optoelectronic receiver module is designed to

operate with transmitters which are compliant with FDA

Radiation Performance Standards, 21 CFR Subchapter J.

and class 1 laser compliant according to International

Safety Standard IEC-825-1.

LONG WAVELENGTH RECEIVER

The M2R-25-72-2-TXXL is provided with single mode

optics. The 1300 nm PIN pre-amp subassemblies

provides highly reliable single mode communications

which enable interoperability with SONET/SDH

equipment.

SONET/SDH INTEROPERABLE

The M2R-25-72-2-TXXL (1300nm) receivers are

interoperable with SONET OC-3 to OC-48 (SDH STM-1 to

STM-16) transmission equipment. They are not tested for

SONET or SDH compliance. SONET/SDH compliance

requires additional testing per GRE-253 standard. For fully

compliant SONET/SDH products, please refer to our

SLC210-7 data sheet.

SHORT WAVELENGTH RECEIVER

The use of short wavelength integrated PIN pre-amp

subassemblies and high volume production processes

has resulted in a low cost, high performance product

available in various data transfer rates up to 2.488 GBaud.

There is no specification for 850nm SONET or SDH

transmission. Therefore, they are not interoperable.

They however are compatible withSONET/SDH

transmission protocols.

ORDERING INFORMATION

M2R - 25 - 72 - X - T X X L

+3.3V POWER SUPPLY

SIGNAL/ALIGNMENT PIN LENGTH

Blank - .125"

M - .150"

D - .125"

DATA OUTPUTS

Blank - PECL

C - CML

SIGNAL DETECT

T - TTL Output

WAVELENGTH

1 - 850 nm (multimode)

2 - 1300 nm (single mode)20km

PROTOCOL

72-Multi-Rate,ATM OC-48 & ATM OC-3

Optoelectronic Products

7444 West Wilson Avenue • Chicago, IL 60656

(708) 867-9600 • (800) 323-6858 • Fax: (708) 867-0996

email:optoinfo@stratoslightwave.com

http://www.stratoslightwave.com



M2R-25-72-X-TXXL Optical Multi-Rate ATM OC-48 -- +3.3V

Dual SFF Receivers -- 2.488GBaud/155MBaud

1152.01 PRELIMINARY

ABSOLUTE MAXIMUM RATINGS

RECOMMENDED OPERATING CONDITIONS

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MODULE SPECIFICATIONS - ELECTRICAL Ta = 25°C; Vcc =+3.3V

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Optoelectronic Products

7444 West Wilson Avenue • Chicago, IL 60656

(708) 867-9600 • (800) 323-6858 • Fax: (708) 867-0996

email:optoinfo@stratoslightwave.com

http://www.stratoslightwave.com



M2R-25-72-X-TXXL Optical Multi-Rate ATM OC-48 -- +3.3V

Dual SFF Receivers -- 2.488GBaud/155MBaud

1152.01 PRELIMINARY

M2R-25-72-1-TXXL ATM OC-48 PERFORMANCE SPECIFICATIONS -- 850nm OPTICAL Ta = 25° C; Vcc =+3.3V

Note: 1This is the link length for at least 95% of the installed fiber base.

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M2R-25-72-2-TXXL ATM OC-48 PERFORMANCE SPECIFICATIONS - 1300nm OPTICAL Ta = 25ºC; Vcc =+3.3V

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

M2R-25-72-X-TXXL Optical Multi-Rate ATM OC-48 -- +3.3V

Dual SFF Receivers -- 2.488GBaud/155MBaud

1152.01 PRELIMINARY

Notes:

1. Some De-Serializer manufacturer's data sheet and application data for appropriate receiver input biasing networks. Some

De-Serializer inputs are internally terminated and may not need external termination resistors.

TERMINATION CIRCUITS

The M2R-25 receivers can operate with PECL logic levels. Output from the receiver section of the module is AC coupled

and is expected to drive into a 50 ohm load. Different termination strategies may be required depending on the particular

Serializer/Deserializer chip set used.

The M2R-25 product family is designed with AC coupled data outputs to provide the following advantages:

!Close positioning of De-Serializer with respect to receiver; allows for shorter line lengths and at

gigabit speeds reduces EMI.

!Minimum number of external components.

!Internal termination reduces the potential for unterminated stubs which would otherwise increase

jitter and reduce transmission margin.

Subsequently, this affords the customer the ability to optimally locate the De-Serializer as close to the M2R-25 as

possible and save valuable real estate on PCI cards and other small circuit assemblies. At gigabit rates this can provide

a significant advantage resulting in better transmission performance and accordingly better signal integrity.

AC coupling allows the Stratos Lightwave M2R-25 to be applied across a wider range of applications without modifica-

tion. This benefits users in terms of enhanced RF performance, reduced component count, tighter layout and fewer

design problems.

Figure 1 & 2 illustrates the recommended receive data line terminations for De-Serializer with CML and PECL inputs

respectively.

Figure 1. Recommended RECEIVE Data Terminations for De-Serializer with CML Inputs

TTL logic level

De-Serializer(B)

CML Inputs

De-Serializer(A)

CML Inputs

RECEIVER (A)

RECEIVER (B)

Z=50Ω



M2R-25-72-X-TXXL Optical Multi-Rate ATM OC-48 -- +3.3V

Dual SFF Receivers -- 2.488GBaud/155MBaud

1152.01 PRELIMINARY

Figure 2. Recommended RECEIVE Data Terminations for De-Serializer with PECL Inputs

TTL logic level

De-Serializer (B)

PECL

Inputs

De-Serializer (A)

PECL

Inputs

RECEIVER (A)

RECEIVER (B)

100Ω

50Ω50Ω

Vcc = +3.3V

50Ω50Ω

Vcc = +3.3V

with VBB

Option 1 Option 2 Option 3

Option 4

D+

D-

D+

D-

D+

D-

130Ω130Ω

Vcc = +3.3V

82Ω82Ω

D+

D-

Vcc = +3.3V

To V

See

Options

Below

Z=50Ω

See

Options

Below

Z=50Ω



M2R-25-72-X-TXXL Optical Multi-Rate ATM OC-48 -- +3.3V

Dual SFF Receivers -- 2.488GBaud/155MBaud

1152.01 PRELIMINARY

POWER COUPLING

A suggested layout for power and ground connections is given in figure 3B below. Connections are made via separate

voltage and ground planes. The mounting posts are at case ground and should not be connected to circuit ground. The

ferrite bead should provide a real impedance of 50 to 100 ohms at 100 to 1000 MHz. Bypass capacitors should be

placed as close to the 10-pin connector as possible.

SIGNAL DETECT

The M2R-25 receivers are equipped with TTL signal detect outputs. The TTL option eliminates the need for a PECL to

TTL level shifter in most applications. The SFF adhoc industry standard provides for a TTL level Signal Detect output.

Figure 3B. Suggested Power Coupling - Component Placement

Figure 3A. Suggested Power Coupling - Electrical Schematic



M2R-25-72-X-TXXL Optical Multi-Rate ATM OC-48 -- +3.3V

Dual SFF Receivers -- 2.488GBaud/155MBaud

1152.01 PRELIMINARY

Note 2

2. SIGNAL / ALIGNMENT PINS LENGTH OPTION

Blank =.125 .010

M =.150 .010

D =.180 .010

1. DIMENTIONS ARE FOR REFERENCE

EMI and ESD CONSIDERATIONS

Stratos Lightwave optoelectronic dual receivers offer a metalized plastic case and a special chassis grounding clip. As

shown in the drawing, this clip connects the module case to chassis ground when installed flush through the panel

cutout. The grounding clip in this way brushes the edge of the cutout in order to make a proper contact. The use of a

grounding clip also provides increased electrostatic protection and helps reduce radiated emissions from the module or

the host circuit board through the chassis faceplate. The attaching posts are at case potential and may be connected to

chassis ground. They should not be connected to circuit ground.

Plastic optical subassemblies are used to further reduce the possibility of radiated emissions by eliminating the metal

from the transmitter which extends into the connector space. By providing a non-metal receptacle for the optical cable

ferrule, the gigabit speed RF electrical signal is isolated from the connector area thus preventing radiated energy leakage

from these surfaces to the outside of the panel.

MECHANICAL DIMENSIONS –

PANEL CUTOUT DIMENSIONS SUGGESTED PCB LAND PATTERN



M2R-25-72-X-TXXL Optical Multi-Rate ATM OC-48 -- +3.3V

Dual SFF Receivers -- 2.488GBaud/155MBaud

1152.01 PRELIMINARY

PHYSICAL DESCRIPTION

The M2R-25 features a compact design with a standard LC duplex connector for fiber optic connections. The 10-pin

connector (70 mil spacing) provides the electrical connection for all operation. With a height of 9.8 mm the M1R-25 fits

mezzanine card applications. An epoxy encapsulation provides excellent protection from environmental hazards and

assists in heat dissipation for all components. Two wave-solderable posts are provided for attaching the package to the

circuit board without the need for multiple attachment operations.

ELECTRICAL INTERFACE, PIN DESCRIPTIONS

Optoelectronic Products

7444 West Wilson Avenue • Chicago, IL 60656

(708) 867-9600 • (800) 323-6858 • Fax: (708) 867-0996

email:optoinfo@stratoslightwave.com

http://www.stratoslightwave.com

IMPORTANT NOTICE

Stratos Lightwave 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. Stratos Lightwave advises its customers to obtain the latest version of the publications

to verify, before placing orders, that the information being relied on is current. Stratos Lightwave Small Form Factor (SFF) products are covered

under U.S. Patent Numbers 5,812,582 and 5,864,468.

Stratos Lightwave warrants performance of its optical link products to current specifications in accordance with Stratos Lightwave standard

warranty. Testing and other quality control techniques are utilized to the extent that Stratos Lightwave has determined it to be necessary to

support this warranty. Specific testing of all parameters of each optical link product is not necessarily performed on all optical link products.

Stratos Lightwave products are not designed for use in life support appliances, submarines, military, flight hardware, devices, or systems

where malfunction of a Stratos Lightwave product can reasonably be expected to result in a personal injury. Stratos Lightwave customers

using or selling optical link products for use in such applications do so at their own risk and agree to fully indemnify Stratos Lightwave for any

damages resulting from such improper use or sale.

Stratos Lightwave assumes no liability for Stratos Lightwave applications assistance, customer product design, software performance, or

infringement of patents or services described herein. Nor does Stratos Lightwave warrant or represent that a license, either expressed or

implied is granted under any patent right, copyright, or intellectual property right , and makes no representations or warranties that these

products are free from patent, copyright, or intellectual property rights.

Applications that are described herein for any of the optical link products are for illustrative purposes only. Stratos Lightwave makes no

representation or warranty that such applications will be suitable for the specified use without further testing or modification.

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