AFBR-5710Z and AFBR-5715Z
Families of Multi-Mode Small Form Factor Pluggable (SFP) Optical
Transceivers with Optional DMI for Gigabit Ethernet (1.25 GBd)
Data Sheet
Description
The AFBR-571xZ family of SFP optical transceivers offers
the customer a wide range of design options, includ-
ing optional DMI features (further described later), two
temperature ranges (extended or industrial), and choice
of standard or bail delatch. The AFBR-5715Z family
targets those applications requiring DMI features. The
AFBR-5710Z family is a streamlined product designed for
those applications where DMI features are not needed.
Throughout this document, AFBR-571xZ will be used to
refer collectively to the product family encompassing this
entire range of product options.
Features
•
ROHS-6 Compliant
•
Compliant to IEEE 802.3 Gigabit Ethernet (1.25GBd)
1000BaseSX
•
Optional Digital Diagnostic Monitoring available
- AFBR-5710Z family: without DMI
- AFBR-5715Z family: with DMI
•
Per SFF-8472, diagnostic features on AFBR-5715Z
family enable Diagnostic Monitoring Interface for
optical transceivers with real-time monitoring of:
- Transmitted optical power
- Received optical power
- Laser bias current
- Temperature
- Supply voltage
•
Transceiver specifications according to SFP Multi-
Source Agreement (SFF-8074i) and SFF-8472, Revision
9.3
•
Manufactured in an ISO 9001 compliant facility
•
Hot-pluggable
•
Temperature options
- (Extended) -10°C to +85°C
- (Industrial) -40°C to +85°C
•
+3.3 V DC power supply
•
Industry leading EMI performance for high port den-
sity
•
850 nm Vertical Cavity Surface Emitting Laser (VCSEL)
•
Eye safety certified
•
LC-Duplex fiber connector compliant
Part Number Options
The AFBR-571xZ SFP family includes the following prod-
ucts:
Part Number
AFBR-5710LZ
AFBR-5710PZ
AFBR-5710ALZ
AFBR-5710APZ
AFBR-5715LZ
AFBR-5715PZ
AFBR-5715ALZ
AFBR-5715APZ
DMI
No
No
No
No
Yes
Yes
Yes
Yes
Temperature
Extended
Extended
Industrial
Industrial
Extended
Extended
Industrial
Industrial
Latch
Standard
Bail
Standard
Bail
Standard
Bail
Standard
Bail
* Extended Temperature Range is -10 to 85 °C
Industrial Temperature Range is -40 to 85 ° C
Related Products
•
AFBR-5705Z family: Dual-Rate 1.25 GBd Ethernet
(1000BASE-SX) & 1.0625 GBd Fiber Channel SFP with
DMI
•
ABCU-5710RZ family : 1.25 GBd Ethernet (1000BASE-T)
SFP for Cat5 cable
•
AFCT-5705Z family: 1.25 GBd Ethernet (1000BASE-LX)
& 1.0265 GBd Fiber-Channel SFP with DMI
Patent -
www.avagotech.com/patents
Applications
•
•
•
•
Ethernet Switch
Enterprise Router
Broadband aggregation and wireless infrastructure
Metro Ethernet multi-service access & provisioning
platforms
OPTICAL INTERFACE
RECEIVER
AMPLIFICATION
& QUANTIZATION
ELECTRICAL INTERFACE
LIGHT FROM FIBER
PHOTO-DETECTOR
RD+ (RECEIVE DATA)
RDÐ (RECEIVE DATA)
Rx LOSS OF SIGNAL
MOD-DEF2 (SDA)
CONTROLLER & MEMORY
MOD-DEF1 (SCL)
MOD-DEF0
TRANSMITTER
LIGHT TO FIBER
LASER
DRIVER &
SAFETY
CIRCUITRY
TX_DISABLE
TD+ (TRANSMIT DATA)
TDÐ (TRANSMIT DATA)
TX_FAULT
VCSEL
Figure 1. SFP Block Diagram
Overview
The AFBR-571xZ family of optical transceivers are com-
pliant with the specifications set forth in the IEEE802.3
(1000BASE-SX) and the Small Form-Factor Pluggable (SFP)
Multi-Source Agreement (MSA). This family of transceivers
is qualified in accordance with Telcordia GR-468-CORE.
Its primary application is servicing Gigabit Ethernet links
between optical networking equipment.
The AFBR-571xZ offers maximum flexibility to designers,
manufacturers, and operators of Gigabit Ethernet net-
working equipment. A pluggable architecture allows the
module to be installed into MSA standard SFP ports at
any time – even with the host equipment operating and
online. This facilitates the rapid configuration of equip-
ment to precisely the user’s needs – reducing inventory
costs and network downtime. Compared with traditional
transceivers, the size of the Small Form Factor package
enables higher port densities.
20
19
18
17
16
15
14
13
12
11
V
EE
T
TD–
TD+
V
EE
T
V
CC
T
V
CC
R
V
EE
R
RD+
RD–
V
EE
R
TOP OF BOARD
321
ENGAGEMENT
SEQUENCE
321
1
2
3
4
5
6
7
8
9
10
V
EE
T
TX FAULT
TX DISABLE
MOD-DEF(2)
MOD-DEF(1)
MOD-DEF(0)
RATE SELECT
LOS
V
EE
R
V
EE
R
BOTTOM OF BOARD
(AS VIEWED THROUGH TOP OF BOARD)
Module Diagrams
Figure 1 illustrates the major functional components of the
AFBR-571xZ. The external configuration of the module is
depicted in Figure 7. Figure 8 depicts the panel and host
board footprints.
Figure 2. Pin description of the SFP electrical interface.
2
Installation
The AFBR-571xZ can be installed in or removed from any
MSA-compliant Pluggable Small Form Factor port regard-
less of whether the host equipment is operating or not.
The module is simply inserted, electrical-interface first,
under finger-pressure. Controlled hot-plugging is ensured
by 3-stage pin sequencing at the electrical interface. This
printed circuit board card-edge connector is depicted in
Figure 2.
As the module is inserted, first contact is made by the
housing ground shield, discharging any potentially com-
ponent-damaging static electricity. Ground pins engage
next and are followed by Tx and Rx power supplies. Finally,
signal lines are connected. Pin functions and sequencing
are listed in Table 2.
Transmit Fault (Tx_Fault)
A catastrophic laser fault will activate the transmitter signal,
TX_FAULT, and disable the laser. This signal is an open collec-
tor output (pull-up required on the host board). A low signal
indicates normal laser operation and a high signal indicates
a fault. The TX_FAULT will be latched high when a laser fault
occurs and is cleared by toggling the TX_DISABLE input or
power cycling the transceiver. The transmitter fault condition
can also be monitored via the 2-wire serial interface (address
A2, byte 110, bit 2).
Eye Safety Circuit
The AFBR-571xZ provides Class 1 eye safety by design and
has been tested for compliance with the requirements
listed in Table 1. The eye safety circuit continuously moni-
tors optical output power levels and will disable the trans-
mitter and assert a TX_FAULT signal upon detecting an
unsafe condition. Such unsafe conditions can be created
by inputs from the host board (Vcc fluxuation, unbalanced
code) or faults within the module.
Transmitter Section
The transmitter section includes the Transmitter Optical
Subassembly (TOSA) and laser driver circuitry. The TOSA,
containing an 850 nm VCSEL (Vertical Cavity Surface Emit-
ting Laser) light source, is located at the optical interface and
mates with the LC optical connector. The TOSA is driven by
a custom IC, which converts differential logic signals into an
analog laser diode drive current. This Tx driver circuit regu-
lates the optical power at a constant level provided the data
pattern is DC balanced (8B10B code for example).
Receiver Section
The receiver section includes the Receiver Optical Subas-
sembly (ROSA) and amplification/quantization circuitry. The
ROSA, containing a PIN photodiode and custom trans-im-
pedance preamplifier, is located at the optical interface and
mates with the LC optical connector. The ROSA is mated to
a custom IC that provides post-amplification and quantiza-
tion. Also included is a Loss Of Signal (LOS) detection circuit.
Transmit Disable (Tx_Disable)
The AFBR-571xZ accepts a TTL and CMOS compatible
transmit disable control signal input (pin 3) which shuts
down the transmitter optical output. A high signal imple-
ments this function while a low signal allows normal
transceiver operation. In the event of a fault (e.g. eye
safety circuit activated), cycling this control signal resets
the module as depicted in Figure 6. An internal pull-up
resistor disables the transceiver transmitter until the host
pulls the input low. Host systems should allow a 10ms
interval between successive assertions of this control
signal. Tx_Disable can also be asserted via the 2-wire serial
interface (address A2h, byte 110, bit 6) and monitored
(address A2h, byte 110, bit 7).
The contents of A2h, byte 110, bit 6 are logic OR’d with
hardware Tx_Disable (pin 3) to control transmitter opera-
tion.
Receiver Loss of Signal (Rx_LOS)
The Loss Of Signal (LOS) output indicates an unusable
optical input power level. The Loss Of Signal thresholds
are set to indicate a definite optical fault has occurred
(e.g., disconnected or broken fiber connection to receiver,
failed transmitter, etc.).
The post-amplification IC includes transition detection
circuitry which monitors the ac level of incoming optical
signals and provides a TTL/CMOS compatible status signal
to the host (pin 8). An adequate optical input results in a
low Rx_LOS output while a high Rx_LOS output indicates
an unusable optical input. The Rx_LOS thresholds are fac-
tory-set so that a high output indicates a definite optical
fault has occurred. For the AFBR-5715Z family, Rx_LOS can
also be monitored via the 2-wire serial interface (address
A2h, byte 110, bit 1).
3
Functional I/O
The AFBR-571xZ accepts industry standard differential
signals such as LVPECL and CML within the scope of the
SFP MSA. To simplify board requirements, transmitter bias
resistors and ac coupling capacitors are incorporated, per
SFF-8074i, and hence are not required on the host board.
The module is AC-coupled and internally terminated.
Figure 3 illustrates a recommended interface circuit to
link the AFBR-571xZ to the supporting Physical Layer
integrated circuits.
Timing diagrams for the MSA compliant control signals
implemented in this module are depicted in Figure 6.
The AFBR-571xZ interfaces with the host circuit board
through twenty I/O pins (SFP electrical connector)
identified by function in Table 2. The AFBR-571xZ high
speed transmit and receive interfaces require SFP MSA
compliant signal lines on the host board. The Tx_Disable,
Tx_Fault, and Rx_LOS lines require TTL lines on the host
board (per SFF-8074i) if used. If an application chooses
not to take advantage of the functionality of these pins,
care must be taken to ground Tx_Disable (for normal
operation).
Digital Diagnostic Interface and Serial Identification
(EEPROM)
The entire AFBR-571xZ family complies with the SFF-
8074i SFP specification. The AFBR-5715Z family further
complies with SFF-8472, the SFP specification for Digital
Diagnostic Monitoring Interface. Both specifications can
be found at http://www.sffcommittee.org.
The AFBR-571xZ features an EEPROM for Serial ID, which
contains the product data stored for retrieval by host
equipment. This data is accessed via the 2-wire serial
EEPROM protocol of the ATMEL AT24C01A or similar, in
compliance with the industry standard SFP Multi-Source
Agreement. The base EEPROM memory, bytes 0-255 at
memory address 0xA0, is organized in compliance with
SFF-8074i. Contents of this serial ID memory are shown
in Table 10.
The I2C accessible memory page address 0xB0 is used
internally by SFP for the test and diagnostic purposes
and it is reserved.
VCCT,R
10 µF
0.1 µF
1 µH
1 µH
HOUSING
GROUND
VCCT
0.1
µF
*RES
TX_DISABLE
TX_FAULT
SO1+
50
Ω
50
Ω
C
C
VEET
10
µF
SI1+
R
SI1–
VCCT,R
50
Ω
50
Ω
C
C
0.1
µF
VCCR
RD+
RD–
AMPLIFICATION
&
QUANTIZATION
TD+
R
TD–
LASER DRIVER
& EYE SAFETY
CIRCUITRY
AVAGO
AFBR-571xZ
*RES
GP04
TX_FAULT
VREFR
TX[0:9]
TBC
EWRAP
MAC
ASIC
RBC
RX_RATE
RX_LOS
SYNC
LOOP
AVAGO
HDMP-1687
RX[0:9]
SYN1
RC1(0:1)
RCM0
RFCT
SO1–
REF_RATE
*RES
*RES
*RES
*RES
RX_LOS
MOD_DEF2
MOD_DEF1
MOD_DEF0
VEER
NOTE: * 4.7 k
Ω
< RES < 10 kΩ
EEPROM
GPIO(X)
GPIO(X)
GP14
REFCLK
125 MHz
Figure 3. Typical application configuration.
4
As an enhancement to the conventional SFP interface
defined in SFF-8074i, the AFBR-5715Z family is compliant
to SFF-8472 (digital diagnostic interface for optical trans-
ceivers). This new digital diagnostic information is stored
in bytes 0-255 at memory address 0xA2.Using the 2-wire
serial interface defined in the MSA, the AFBR-5715Z
provides real time temperature, supply voltage, laser
bias current, laser average output power and received
input power. These parameters are internally calibrated,
per the MSA.
The digital diagnostic interface also adds the ability to
disable the transmitter (TX_DISABLE), monitor for Trans-
mitter Faults (TX_FAULT), and monitor for Receiver Loss
of Signal (RX_LOS).
The new diagnostic information provides the oppor-
tunity for Predictive Failure Identification, Compliance
Prediction, Fault Isolation and Component Monitoring.
component compliance issues. Received optical power is
also available to assess compliance of a cable plant and
remote transmitter. When operating out of requirements,
the link cannot guarantee error free transmission.
Fault Isolation
The fault isolation feature allows a host to quickly pin-
point the location of a link failure, minimizing downtime.
For optical links, the ability to identify a fault at a local
device, remote device or cable plant is crucial to speeding
service of an installation. AFBR-5715Z real-time monitors
of Tx_Bias, Tx_Power, Vcc, Temperature and Rx_Power
can be used to assess local transceiver current operating
conditions. In addition, status flags Tx_Disable and Rx Loss
of Signal (LOS) are mirrored in memory and available via
the two-wire serial interface.
Component Monitoring
Component evaluation is a more casual use of the AFBR-
5715Z real-time monitors of Tx_Bias, Tx_Power, Vcc, Tem-
perature and Rx_Power. Potential uses are as debugging
aids for system installation and design, and transceiver
parametric evaluation for factory or field qualification.
For example, temperature per module can be observed in
high density applications to facilitate thermal evaluation
of blades, PCI cards and systems.
Predictive Failure Identification
The predictive failure feature allows a host to identify
potential link problems before system performance is
impacted. Prior identification of link problems enables
a host to service an application via “fail over” to a redun-
dant link or replace a suspect device, maintaining system
uptime in the process. For applications where ultra-high
system uptime is required, a digital SFP provides a means
to monitor two real-time laser metrics associated with ob-
serving laser degradation and predicting failure: average
laser bias current (Tx_Bias) and average laser optical power
(Tx_Power).
Required Host Board Components
The MSA power supply noise rejection filter is required on
the host PCB to meet data sheet performance. The MSA
filter incorporates an inductor which should be rated 400
mADC and 1
Ω
series resistance or better. It should not
be replaced with a ferrite. The required filter is illustrated
in Figure 4.
The MSA also specifies that 4.7 K to 10 KΩ pull-up resis-
tors for TX_FAULT, LOS, and MOD_DEF0,1,2 are required
on the host PCB.
Compliance Prediction
Compliance prediction is the ability to determine if an
optical transceiver is operating within its operating and
environmental requirements. AFBR-5715Z devices provide
real-time access to transceiver internal supply voltage
and temperature, allowing a host to identify potential
V
CC
T
0.1 µF
1 µH
V
CC
R
0.1 µF
10 µF
1 µH
0.1 µF
10 µF
3.3 V
SFP MODULE
HOST BOARD
Figure 4. MSA required power supply filter.
5
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