
4
fluctuation, unbalanced code) or
a fault within the transceiver.
Receiver Section
The receiver section includes the
Receiver Optical SubAssembly
(ROSA) and the amplification/
quantization circuitry. The
ROSA, containing a PIN photo-
diode and custom transimped-
ance amplifier, is located at the
optical interface and mates with
the LC optical connector. The
ROSA output is fed to a custom
IC that provides post-
amplification and quantization.
Receiver Loss of Signal (Rx_LOS)
The post-amplification IC also
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.
Rx_LOS can also be monitored
via the two-wire serial interface
(address A2h, byte 110, bit 1).
Functional Data I/O
The AFCT-57R5ATPZ interfaces
with the host circuit board
through twenty I/O pins (SFP
electrical connector) identified
by function in Table 2. The
board layout for this interface is
depicted in Figure 6.
The AFCT-57R5ATPZ high speed
transmit and receive interfaces
require SFP MSA compliant
signal lines on the host board. To
simplify board requirements,
biasing resistors and ac coupling
capacitors are incorporated into
the SFP transceiver module (per
SFF-8074i) and hence are not
required on the host board. The
Tx_Disable, Tx_Fault, Rx_LOS
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).
Figure 2 depicts the
recommended interface circuit
to link the AFCT-57R5ATPZ to
supporting physical layer ICs.
Timing for MSA compliant
control signals implemented in
the transceiver are listed in
Figure 4.
Application Support
An Evaluation Kit and Reference
Designs are available to assist in
evaluation of the AFCT-
57R5ATPZ. Please contact your
local Field Sales representative
for availability and ordering
details.
Caution
There are no user serviceable
parts nor maintenance require-
ments for the AFCT-57R5ATPZ.
All mechanical adjustments are
made at the factory prior to
shipment. Tampering with,
modifying, misusing or
improperly handling the AFCT-
57R5ATPZ will void the product
warranty. It may also result in
improper operation and possibly
overstress the laser source.
Performance degradation or
device failure may result.
Connection of the AFCT-
57R5ATPZ to a light source not
compliant with ANSI FC-PI or
IEEE 802.3 specifications,
operating above maximum
operating conditions or in a
manner inconsistent with it’s
design and function may result in
exposure to hazardous light
radiation and may constitute an
act of modifying or manufactur-
ing a laser product. Persons
performing such an act are
required by law to re-certify and
re-identify the laser product
under the provisions of U.S. 21
CFR (Subchapter J) and TUV.
Ordering Information
Please contact your local field sales
engineer or one of Avago
Technologies franchised distributors
for ordering information. For
technical information, please visit
Avago Technologies’ WEB page at
www.avagotech.com or contact
Avago Technologies Semiconductor
Products Customer Response Center
at 1-800-235-0312. For information
related to SFF Committee
documentation visit
www.sffcommittee.org.
Regulatory Compliance
The AFCT-57R5ATPZ complies with
all applicable laws and regulations as
detailed in Table 1. Certification level
is dependent on the overall
configuration of the host equipment.
The transceiver performance is
offered as a figure of merit to assist
the designer.
Electrostatic Discharge (ESD)
The AFCT-57R5ATPZ is compatible
with ESD levels found in typical
manufacturing and operating
environments as described in Table
1. In the normal handling and oper-
ation of optical transceivers, ESD is
of concern in two circumstances.
The first case is during handling of
the transceiver prior to insertion into
an SFP compliant cage. To protect
the device, it’s important to use
normal ESD handling precautions.