Rev 2.5
68
Mellanox Technologies
5
SCL
2-wire Serial Interface Clock Line
d
6
MOD_ABS
Module Absent. Grounded within the module
d
7
RS0
No connection required
8
RX_LOS
Loss of Signal indication. Logic 0 indicates normal operation.
e
9
RS1
No connection required
10
VeeR
Receiver Ground (Common with Transmitter Ground)
a
11
VeeR
Receiver Ground (Common with Transmitter Ground)
a
12
RD-
Receiver Inverted DATA out. AC Coupled
13
RD+
Receiver Non-inverted DATA out. AC Coupled
14
VeeR
Receiver Ground (Common with Transmitter Ground)
a
15
VccR
Receiver Power Supply
16
VccT
Transmitter Power Supply
17
VeeT
Transmitter Ground (Common with Receiver Ground)
a
18
TD+
Transmitter Non-Inverted DATA in. AC Coupled.
19
TD-
Transmitter Inverted DATA in. AC Coupled.
20
VeeT
Transmitter Ground (Common with Receiver Ground)
a
a. Circuit ground is internally isolated from chassis ground.
b. T
FAULT
is an open collector/drain output, which should be pulled up with a 4.7k – 10k Ohms resis-
tor on the host board if intended for use. Pull up voltage should be between 2.0V to Vcc + 0.3V. A
high output indicates a transmitter fault caused by either the TX bias current or the TX output power
exceeding the preset alarm thresholds. A low output indicates normal operation. In the low state, the
output is pulled to <0.8V.
c. Laser output disabled on TDIS >2.0V or open, enabled on TDIS <0.8V
d. Should be pulled up with 4.7kΩ – 10kΩ on host board to a voltage between 2.0V and 3.6V.
MOD_ABS pulls line low to indicate module is plugged in.
e. LOS is open collector output. Should be pulled up with 4.7kΩ – 10kΩ on host board to a voltage
between 2.0V and 3.6V. Logic 0 indicates normal operation; logic 1 indicates loss of signal.
Table 16 - SFP28 Connector Pinout
Pin
Symbol Name
Description