1.25Gbps Spring-latch SFP Transceiver

22dB/30dB Min. link budget, RoHS compliant

June 13, 2007

Fiberxon Proprietary and Confidential, Do Not Copy or Distribute

Page 9 of 12

Table 8– Pin Function Definitions

Pin No.

Name

Function

Plug Seq.

Notes

1

VeeT

Transmitter Ground

1

2

TX Fault

Transmitter Fault Indication

3

Note 1

3

TX Disable

Transmitter Disable

3

Note 2

4

MOD-DEF2

Module Definition 2

3

Note 3

5

MOD-DEF1

Module Definition 1

3

Note 3

6

MOD-DEF0

Module Definition 0

3

Note 3

7

Rate Select

Not Connected

3

8

LOS

Loss of Signal

3

Note 4

9

VeeR

Receiver Ground

1

10

VeeR

Receiver Ground

1

11

VeeR

Receiver Ground

1

12

RD-

Inv. Received Data Out

3

Note 5

13

RD+

Received Data Out

3

Note 5

14

VeeR

Receiver Ground

1

15

VccR

Receiver Power

2

16

VccT

Transmitter Power

2

17

VeeT

Transmitter Ground

1

18

TD+

Transmit Data In

3

Note 6

19

TD-

Inv. Transmit Data In

3

Note 6

20

VeeT

Transmitter Ground

1

Notes:

1. TX Fault is an open collector output, which should be pulled up with a 4.7k~10k

Ω resistor on the host

board to a voltage between 2.0V and Vcc+0.3V. Logic 0 indicates normal operation; logic 1 indicates a

laser fault of some kind. In the low state, the output will be pulled to less than 0.8V.

2. TX Disable is an input that is used to shut down the transmitter optical output. It is pulled up within the

module with a 4.7k~10k

Ω resistor. Its states are:

Low (0~0.8V):

Transmitter on

(>0.8V, <2.0V):

Undefined

High (2.0~3.465V):

Transmitter Disabled

Open:

Transmitter Disabled

3. MOD-DEF 0,1,2 are the module definition pins. They should be pulled up with a 4.7k~10k

Ω resistor on

the host board. The pull-up voltage shall be VccT or VccR.

MOD-DEF 0 is grounded by the module to indicate that the module is present

MOD-DEF 1 is the clock line of two wires serial interface for serial ID

MOD-DEF 2 is the data line of two wires serial interface for serial ID

4. LOS is an open collector output, which should be pulled up with a 4.7k~10k

Ω resistor on the host board to

a voltage between 2.0V and Vcc+0.3V. Logic 0 indicates normal operation; logic 1 indicates loss of signal.

In the low state, the output will be pulled to less than 0.8V.

5. These are the differential receiver output. They are internally AC-coupled 100Ω differential lines which

should be terminated with 100Ω (differential) at the user SERDES.