4

MUlTIPROTOCOl XFP OPTICAl TRANSCEIvER

—1550 NM FOR UP TO 40 KM REACH

low-speed Signaling

Low-speed signaling is based on low voltage TTL (LVTTL) operating at a nominal

voltage of 3.3 V.

SCL/SDA: Two-wire serial interface clock and data line. Hosts should use a pull-up

resistor connected to Vcc 3.3 V on the two-wire interface SCL (clock), SDA (data),

and all low speed outputs.

Mod_NR:Outputpin.Whenassertedhighindicatesthatthemodulehasdetecteda

condition that renders Tx and or Rx data invalid.

Mod_DeSel:Inputpin.Whenheldlowbythehostthemodulerespondstotwo-wire

serialcommunicationcommands.Whenhighthemoduledoesnotrespondtoor

acknowledge any two-wire interface communication from the host.

Interrupt:Outputpin.Whenlowindicatespossiblemoduleoperationalfaultora

status critical to the host system.

TX_DIS:Inputpin.Whenassertedhighthetransmitteroutputisturnedoff.

Mod_ABS: Output pin. Asserted high when the XFP module is absent and is pulled

low when the XFP module is inserted.

RX_LOS: Output pin. Asserted high when insufficient optical power for reliable sig-

nal reception is received.

P_Down/RST: Multifunction input pin. The module can be powered down or reset

by pulling the low-speed P-Down pin high. In power down mode no data is trans-

mitted on the optical Tx or the electrical Rx path. The reset pulse is generated on the

falling edge of the P-Down signal. Following reset, the internal PLL’s must reacquire

lock and will temporarily indicate a Mod_NR failure until the PLL’s reacquire lock.

Recommended MSA connections to the JDSU 10 Gbps 1550 nm multiprotocol

XFP optical transceiver are shown in Figure 2 on page 5.

Power supply filtering is recommended for the JDSU 10 Gbps 1550 nm multipro-

tocol XFP optical transceiver. To limit wide band noise power, the host system and

module shall each meet a maximum of 2 percent peak-to-peak noise when mea-

sured with a 1 MHz low pass filter. In addition, the host system and the module

shall each meet a maximum of 3 percent peak-to-peak noise when measured with

a filter from 1 MHz–10 MHz.

Section 2

Application Schematics