4
Receiver Section
The receiver section includes the Receiver Optical Sub-
Assembly (ROSA) and the amplication/quantization cir-
cuitry. The ROSA, containing a PIN photodiode and cus-
tom transimpedance amplier, 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-
amplication and quantization.
Fibre Channel Rate Select (Rate_Select)
The AFBR-57R6APZ transceiver contains a parametric op-
timiza-tion circuit to insure compliant performance for
1.0625 Gb/s, 2.125 Gb/s and 4.25 Gb/s data rates. When
Rate_Select (pin 7) is asserted, the transceiver receiver
bandwidth is optimized for 4.25G/2.125G performance
as dened in document SFF-8079 Section 5.1 (current-
ly on Draft 1.7) and ANSI FC-PI-2. When deasserted (or
open), performance is optimized for 2.125G/1.065G per-
formance per SFF-8074i and SFF-8079. Rate_Select can
also be asserted via the two-wire serial interface (address
A2h, byte 110, bit 3) and monitored (address A2h, byte
110, bit 4).
The contents of A2h, byte 110, bit 3 are logic OR’d with
hardware Rate_Select (pin 7) to control transmitter op-
eration.
Receiver Loss of Signal (Rx_LOS)
The post-amplication IC also includes transition detec-
tion 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 in-
put 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 denite 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 AFBR-57R6APZ interfaces with the host circuit board
through twenty I/O pins (SFP electrical connector) iden-
tied by function in Table 2. The board layout for this in-
terface is depicted in Figure 6.
The AFBR-57R6APZ high speed transmit and receive in-
terfaces require SFP MSA 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-8074i) and hence
are not required on the host board. The Tx_Disable, Tx_
Fault, Rx_LOS, and Rate_Select 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).
Figure 2 depicts the recom mended interface circuit to
link the AFBR-57R6APZ 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 AFBR-57R6APZ. Please contact
your local Field Sales representative for availability and
ordering details.
Caution
There are no user serviceable parts nor maintenance
requirements for the AFBR-57R6APZ. All mechanical
adjustments are made at the factory prior to shipment.
Tampering with, modifying, misusing or improperly han-
dling the AFBR-57R6APZ will void the product warranty.
It may also result in improper operation and possibly
overstress the laser source. Performance degrada tion
or device failure may result. Connection of the AFBR-
57R6APZ to a light source not compliant with ANSI FC-PI
or IEEE 802.3 specications, 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
manufacturing 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 (Sub-
chapter J) and TUV.
Ordering Information
Please contact your local eld sales engineer or one of
Avago Technologies franchised distributors for ordering
information. For technical information, please visit Ava-
go Technologies’ WEB page at www.Avago.com or contact
Avago Technologies Semicon-ductor Products Customer
Response Center at 1-800-235-0312. For information re-
lated to SFF Committee documentation visit www.scom-
mittee.org.
Regulatory Compliance
The AFBR-57R6APZ complies with all applicable laws and
regulations as detailed in Table 1. Certication level is de-
pendent on the overall conguration of the host equip-
ment. The transceiver performance is oered as a gure
of merit to assist the designer.
