Fc-Al Transmitters And Receivers; Power; Fault Led Out; Figure 17. Fc-Al Transmitters And Receivers - Seagate Savvio 10K Product Manual

9.5.5

FC-AL transmitters and receivers

A typical FC-AL differential copper transmitter and receiver pair is shown in Figure 17. The receiver is required
to provide the AC coupling to eliminate ground shift noise.
TX
Transmitter 100
TY

Figure 17. FC-AL transmitters and receivers

Savvio drives use 100 ohm termination which makes it compatible with backplanes designed for 1, 2, or 4 Gbit
Fibre Channel transfer rates. Previous generations of Seagate FC products used 150 ohm impedance for
operation in host systems designed to operate in 1 or 2 Gbit transfer rate environments.
9.5.6

Power

Power is supplied through the FC-SCA with support for +5 volts and +12 volts. All of the voltage pins in the
drive connector are the same length.
Four 12 volt pins provide +12 volt power to the drive. The current return for the +12 volt power supply is
through the common ground pins. The supply current and return current must be distributed as evenly as pos-
sible among the pins. The maximum current typically occurs while the drive motor is starting.
Three 5 volt pins provide logic power to the drive. The current return for the +5 volt power supply is through the
common ground pins. Distribute supply and return current as evenly as possible among the voltage and
ground pins.
The mating connector pins use shorter contacts to achieve power surge reductions and to aid in "hot plugging"
the drives. There are longer voltage contacts in the connector to enable the drive filter capacitors to charge.
Current to the drive through the long charge pins is limited by the system in which the drive operates. Three of
the +12 volt pins are shorter to allow capacitive pre-charging through the longer +12 volt charge pin. Two of the
+5 volt pins are shorter to allow capacitive precharging through the longer +5 volt charge pin.
9.5.7

Fault LED Out

The Fault LED Out signal is driven by the drive when:
• the drive detects failure of both ports
• the drive detects an internal failure
• the drive receives the appropriate fault LED command from the host
The Fault LED Out signal is designed to pull down the cathode of an LED. The anode is attached to the proper
+5 volt supply through an appropriate current-limiting resistor. The LED and the current-limiting resistor are
external to the drive.
Savvio FC Product Manual, Rev. D
.01
100 Differential
Transfer Medium
.01
RX
100 Receiver
RY
63