AFBR-5701Z and AFBR-5705Z
Families of Multi-Mode Small Form Factor Pluggable (SFP) Optical
Transceivers with Optional DMI for Gigabit Ethernet (1.25 GBd) and
Fibre Channel (1.0625 GBd)
Data Sheet
Description
The AFBR-570xZ family of SFP optical transceivers offers
the customer a wide range of design options, including
optional DMI features (further described later), two
temperature ranges (extended or industrial), and choice
of standard or bail delatch. The AFBR-5705Z family
targets those applications requiring DMI features. The
AFBR-5701Z family is a streamlined product designed
for those applications where DMI features are not
needed. Throughout this document, AFBR-570xZ will
be used to refer collectively to the product family
encompassing this entire range of product options.
Part Number Options
The AFBR-570xZ SFP family includes the following
products:
Part Number
AFBR-5701LZ
AFBR-5701PZ
AFBR-5701ALZ
AFBR-5701APZ
AFBR-5705LZ
AFBR-5705PZ
AFBR-5705ALZ
AFBR-5705APZ
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
Features
•
ROHS-6 Compliant
•
Compliant to IEEE 802.3 Gigabit Ethernet (1.25GBd)
1000BaseSX & Fiber Channel FC-PI 100-M5-SN-I & 100-
M6-SN-I
•
Optional Digital Diagnostic Monitoring available
- AFBR-5701Z family: without DMI
- AFBR-5705Z family: with DMI
•
Per SFF-8472, diagnostic features on AFBR-5705Z 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 density
•
850 nm Vertical Cavity Surface Emitting Laser (VCSEL)
•
Eye safety certified
•
LC-Duplex fiber connector compliant
Applications
•
Ethernet Switch
•
Enterprise Router
•
Broadband aggregation and wireless infrastructure
•
Storage applications including Fiber Channel and iSCSCI
* Extended Temperature Range is -10 to 85 °C
Industrial Temperature Range is -40 to 85 ° C
Related Products
•
AFBR-5715Z family: 1.25 GBd Ethernet (1000BASE-SX)
SFP with DMI
•
AFBR-5710Z family : 1.25 GBd Ethernet (1000BASE-SX)
SFP without DMI
•
AFCT-5705Z family: 1.25 GBd Ethernet (1000BASE-LX) &
1.0265 GBd Fiber-Channel SFP with DMI
•
AFCT-5701Z family: 1.25 GBd Ethernet (1000BASE-LX) &
1.0265 GBd Fiber-Channel SFP without DMI
OPTICAL INTERFACE
RECEIVER
AMPLIFICATION
& QUANTIZATION
ELECTRICAL INTERFACE
LIGHT FROM FIBER
PHOTO-DETECTOR
RD+ (RECEIVE DATA)
RD—(RECEIVE DATA)
Rx LOSS OF SIGNAL
MOD-DEF2 (SDA)
CONTROLLER & MEMORY
MOD-DEF1 (SCL)
MOD-DEF0
TRANSMITTER
LASER
DRIVER &
SAFETY
CIRCUITRY
TX_DISABLE
TD+ (TRANSMIT DATA)
TD—(TRANSMIT DATA)
TX_FAULT
LIGHT TO FIBER
VCSEL
Figure 1. SFP Block Diagram
Overview
The AFBR-570xZ family of optical transceivers are
compliant with the specifications set forth in the
IEEE802.3 (1000BASE-SX), Fibre Channel (100-M5-SN-I,
100-M6-SN-I), 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 and Fibre Channel links between optical
networking equipment.
The AFBR-570xZ offers maximum flexibility to designers,
manufacturers, and operators of Gigabit Ethernet
networking 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 equipment 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.
Module Diagrams
Figure 1 illustrates the major functional components of the
AFBR-570xZ. The external configuration of the module is
depicted in Figure 7. Figure 8 depicts the panel and host
board footprints.
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)
Figure 2. Pin description of the SFP electrical interface.
2
Installation
The AFBR-570xZ can be installed in or removed from any
MSA-compliant Pluggable Small Form Factor port
regardless 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
component-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.
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
Emitting 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 regulates the optical power at a constant
level provided the data pattern is DC balanced (8B10B
code for example).
Transmit Disable (Tx_Disable)
The AFBR-570xZ accepts a TTL and CMOS compatible
transmit disable control signal input (pin 3) which shuts
down the transmitter optical output. A high signal
implements 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
operation.
Transmit Fault (Tx_Fault)
A catastrophic laser fault will activate the transmitter signal,
TX_FAULT, and disable the laser. This signal is an open
collector 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-570xZ 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
monitors optical output power levels and will disable the
transmitter 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.
Receiver Section
The receiver section includes the Receiver Optical
Subassembly (ROSA) and amplification/quantization
circuitry. The ROSA, containing a PIN photodiode and
custom trans-impedance 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 quantization. Also included is a Loss Of
Signal (LOS) detection circuit.
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 factory-set so that a high output indicates
a definite optical fault has occurred. For the AFBR-5705Z
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-570xZ 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-570xZ 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-570xZ interfaces with the host circuit board
through twenty I/O pins (SFP electrical connector)
identified by function in Table 2. The AFBR-570xZ 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).
VCCT,R
10 µF
0.1 µF
Digital Diagnostic Interface and Serial Identification
(EEPROM)
The entire AFBR-570xZ family complies with the SFF-
8074i SFP specification. The AFBR-5705Z 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-570xZ 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.
1 µH
1 µH
HOUSING
GROUND
VCCT
0.1
µF
*RES
TX_DISABLE
TX_FAULT
SO1+
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
SI1+
R
SI1–
VCCT,R
50
Ω
50
Ω
C
C
10
µF
0.1
µF
SO1–
50
Ω
50
Ω
C
C
VEET
VCCR
TD+
R
TD–
LASER DRIVER
& EYE SAFETY
CIRCUITRY
AVAGO
AFBR-570xZ
*RES
GP04
TX_FAULT
VREFR
RD+
RD–
AMPLIFICATION
&
QUANTIZATION
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-5705Z family is compliant
to SFF-8472 (digital diagnostic interface for optical
transceivers). 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-
5705Z 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
Transmitter Faults (TX_FAULT), and monitor for Receiver
Loss of Signal (RX_LOS).
The new diagnostic information provides the
opportunity for Predictive Failure Identification,
Compliance Prediction, Fault Isolation and Component
Monitoring.
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
redundant 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 observing laser degradation and
predicting failure: average laser bias current (Tx_Bias)
and average laser optical power (Tx_Power).
Compliance Prediction
Compliance prediction is the ability to determine if an
optical transceiver is operating within its operating and
environmental requirements. AFBR-5705Z devices
provide real-time access to transceiver internal supply
voltage and temperature, allowing a host to identify
1 µH
V
CC
T
0.1 µF
potential 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
pinpoint 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-5705Z 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-5705Z real-time monitors of Tx_Bias, Tx_Power,
Vcc, Temperature 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.
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
resistors for TX_FAULT, LOS, and MOD_DEF0,1,2 are
required on the host PCB.
1 µH
V
CC
R
0.1 µF
10 µF
0.1 µF
10 µF
3.3 V
SFP MODULE
HOST BOARD
Figure 4. MSA required power supply filter.
5
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