
4
Receiver Section
The receiver section includes the Receiver Optical Sub-
Assembly (ROSA) and the amplication/quantization
circuitry. The ROSA, containing a PIN photodiode and
custom transimpedance amplier, is located at the op-
tical interface and mates with the LC optical connector.
The ROSA output is fed to a custom IC that provides
post-amplication and quantization.
Receiver Loss of Signal (Rx_LOS)
The post-amp IC also includes transition detection cir-
cuitry which monitors the AC level of incoming optical
signals and provides a LVTTL/CMOS compatible status
signal to the host. A high status signal indicates loss of
modulated signal, indicating link failures such as broken
ber or failed transmitter. Rx_LOS can also be monitored
via the two-wire serial interface(address A2h, byte 110,
bit 1).
Functional Data I/O
The AFCT-701SDDZ interfaces with the host circuit board
through the twenty contact SFP+ electrical connector.
See Table 2 for contact descriptions. The module edge
connector is shown in Figure 3.
The AFCT-701SDDZ high speed transmit and receive in-
terfaces require SFF-8431 compliant signal lines on the
host board. To simplify board requirements, biasing re-
sistors and AC coupling capacitors are incorporated into
the SFP+ transceiver module (per SFF-8431) and hence
are not required on the host board. The TX_DISABLE,
TX_FAULT and RX_LOS signals require LVTTL signals on
the host board (per SFF-8431) if used. If an application
does not take advantage of these functions, care must
be taken to ground TX_DISABLE to enable normal op-
eration.
Figure 2 depicts the recommended interface circuit to
link the AFCT-701SDDZ to supporting physical layer ICs.
Timing for the dedicated SFP+ control signals imple-
mented in the transceiver is shown in Figure 5.
Application Support
An Evaluation Kit and Reference Designs are available to
assist in evaluation of the AFCT-701SDDZ. Please contact
your local Field Sales representative for availability and
ordering details.
Caution
There are no user serviceable parts nor maintenance
requirements for the AFCT-701SDDZ. All mechanical
adjustments are made at the factory prior to shipment.
Tampering with, modifying, misusing or improperly han-
dling the AFCT-701SDDZ 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-701
SDDZ to a light source not compliant with IEEE Std.
802.3ae Clause 52 and SFF-8341 specications, operat-
ing above maximum operating conditions or in a man-
ner inconsistent with it’s design and function may result
in exposure to hazardous light radiation and may consti-
tute an act of modifying or manufacturing a laser prod-
uct. Persons performing such an act are required by law
to recertify and re-identify the laser product under the
provisions of U.S. 21 CFR (Subchapter J) and TUV.
Customer Manufacturing Processes
This module is pluggable and is not designed for aque-
ous wash, IR reow, or wave soldering processes.
Ordering Information
Please contact your local eld sales engineer or one of
Avago Technologies franchised distributors for order-
ing information. For technical information, please visit
Avago Technologies’ WEB page at www.avagotech.com
For information related to SFF Committee documenta-
tion visit www.scommittee.org.