JSH-42L3AD3-5G JDSU [JDS Uniphase Corporation], JSH-42L3AD3-5G Datasheet - Page 7

• Manufacturer Part Number: JSH-42L3AD3-5G
• Description: LW 4x/2x/1x FC SFP with DDM
• Manufacturer: JDSU [JDS Uniphase Corporation]

Output Signal Timings
Output Signal Definitions
Levels for the signals described in this section are listed in Receive Signal Interface (from transceiver to host)
on page 17 and Control Electrical Interface on page 17.
Rx_DAT
The incoming optical signal is converted and repowered as a differential serial data stream. The Receive Sig-
nal Interface (from transceiver to host) table on page 17 gives the voltage levels and timing characteristics for
the Rx_DAT signals.
Rx_LOS
The Receive Loss of Signal line is high (logic one) when the incoming modulated light intensity is below that
required to guarantee the correct operation of the link. Normally, this only occurs when either the link is
unplugged or the companion transceiver is turned off. This signal is normally used by the system for diagnos-
tic purposes.
This signal has an open drain TTL driver. A pull up resistor is required on the host side of the SFF connector.
The recommended value for this resistor is 10 kΩ.
Tx_Fault
Upon sensing an improper power level in the laser or any other potentially unsafe condition, the SFF sets this
signal high and turns off the laser. The Tx_Fault signal can be reset with the Tx_Disable line.
The laser is turned off within 100 μs as shown in the Transmitter Fault Detection timing diagram below.
This signal has an open drain TTL driver. A pull up resistor is required on the host side of the SFF connector.
The recommended value for this resistor is 10 kΩ.
Tx_Fault can also become active if the alarm/warning enable control bits are set within the 0xA2page. For a
complete description see section “Vendor Specific Digital Diagnostic Monitor TX_FAULT Alarm/Warning
Interrupt” on page 37.
OCTOBER 2008
Optical Signal
Rx_LOS
Receive Loss of Signal Detection
t_loss_on
<100μs
Signal Removed
t_loss_off
<100μs
Occurrence of
safety fault
transmitter
Tx_Fault
Optical
Power
Transmitter Fault Detection
JDSU Product Specification 21111542-001
JSH-42L3AD3-5, JSH-42L3AD3-5G
LW 4x/2x/1x FC SFP with DDM
<100μs
t_fault
JSH-42L3AD3-20
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