AFBR-79E4Z Avago Technologies US Inc., AFBR-79E4Z Datasheet - Page 3

• Manufacturer Part Number: AFBR-79E4Z
• Description: 56T4986
• Manufacturer: Avago Technologies US Inc.

Specifications of AFBR-79E4Z

• Applications: Gigabit Ethernet
• Data Rate Max: 10.3125Gbps
• Supply Voltage: 3.3V
• Wavelength Typ: 850nm
• Lead Free Status / Rohs Status: Compliant

Figure 2. Application Reference Diagram
Control Signal Interface
The module has the following low speed signals for
control and status: ModSelL, LPMode, ResetL, ModPrsL,
IntL. In addition, there is an industry standard two wire
serial interface scaled for 3.3 volt LVTTL. It is implemented
as a slave device. Signals and timing characteristics are
further defined in the Control Interface section. The
registers of the serial interface memory are defined in the
Memory Map section and corresponding Avago Technol-
ogies QSFP+ Memory Map document.
Digital Diagnostic Monitoring
Digital diagnostic monitoring is available for AFBR-79E4Z-D.
The information provides opportunity for predictive failure
identification, compliance prediction, fault isolation and
component monitoring.
Predictive Failure Identification
tion allows the host system to identify potential link
problems. Once identified, a “failover” technique can be
used to isolate and replace suspect devices before system
uptime is impacted.
Compliance Prediction
meters can be monitored to alert the system when
operating limits are exceeded and compliance cannot be
ensured. As an example, the real time average receiver
optical power can be used to assess the compliance of the
cable plant and remote transmitter.
Fault Isolation
the host to pinpoint the location of a link problem and
accelerate system servicing and minimize downtime.
3
– The diagnostic information can allow
ASIC (SerDes)
– The real-time diagnostic para-
(Only one channel shown for simplicity)
– The diagnostic informa-
Host Board
Component Monitoring
cation and verification, real time transceiver diagnostic in-
formation can be combined with system level monitoring
to ensure performance and operating environment are
meeting application requirements.
Digital diagnostic monitoring for the following attributes
is implemented.
Transceiver module temperature
internal temperature (lower page 0 bytes 22-23)
Transceiver module power supply
supply voltage (lower page 0 bytes 26-27)
Transmitter laser bias current
current for each transmitter channel (lower page 0 bytes
42-43 for ch.1, bytes 44-45 for ch.2, bytes 46-47 for ch.3,
bytes 48-49 for ch.4)
Receiver input power
power for each receiver channel (lower page 0 bytes 34-35
for ch.1, bytes 36-37 for ch.2, bytes 38-39 for ch.3, bytes
40-41 for ch.4)
All diagnostic monitor attributes are two-byte fields. To
maintain coherency, the host must access these with
single two-byte read sequences.
For each monitored attribute, alarm and warning thresh-
olds are established. Flags are set and interrupts generated
when the attributes are outside the thresholds. All flags
are latched and will remain set even if the condition initi-
ating the flag clears. A mask bit that can be set to prevent
assertion of interrupt for each individual attribute exists for
every monitor flag. Entries in the mask fields are volatile.
QSFP + Module
Tx In p
Tx In n
Rx Out p
Rx Out n
– reports the average input optical
– As part of host system qualifi-
Tx
Rx
– reports the DC laser bias
– reports the module +3.3V
– represents the module
Rx 1
Rx 2
Rx 3
Rx 4
Tx 4
Tx 3
Tx 2
Tx 1