
CWDM BIDI SFP Series
Eoptolink Technology Inc., Ltd. V2.d
Page 11 of 16
Pin Function Definitions
Pin
Num.
Name FUNCTION
Plug
Seq.
Notes
1 VeeT Transmitter Ground 1 5)
2 TX Fault
Transmitter Fault
Indication
3 1)
3 TX Disable Transmitter Disable 3
2), Module disables on high or
open
4 MOD-DEF2
Module Definition 2 3 3), Data line for Serial ID.
5 MOD-DEF1
Module Definition 1 3 3), Clock line for Serial ID.
6 MOD-DEF0
Module Definition 0 3
3), Grounded within the
module.
7 Rate Select
Not Connect 3 Function not available
8 LOS Loss of Signal 3 4)
9 VeeR Receiver Ground 1 5)
10 VeeR Receiver Ground 1 5)
11 VeeR Receiver Ground 1 5)
12 RD- Inv. Received Data Out 3 6)
13 RD+ Received Data Out 3 7)
14 VeeR Receiver Ground 1 5)
15 VccR Receiver Power 2 3.3 ± 5%, 7)
16 VccT Transmitter Power 2 3.3 ± 5%, 7)
17 VeeT Transmitter Ground 1 5)
18 TD+ Transmit Data In 3 8)
19 TD- Inv. Transmit Data In 3 8)
20 VeeT Transmitter Ground 1 5)
1) TX Fault is an open collector/drain output, which should be pulled up with a 4.7K – 10KΩ resistor
on the host board. Pull up voltage between 2.0V and VccT, R+0.3V. When high, output indicates a
laser fault of some kind. Low indicates normal operation. In the low state, the output will be pulled
to < 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 4.7 – 10 K Ω resistor. Its states are:
Low (0 – 0.8V): Transmitter on
(>0.8, < 2.0V): Undefined
High (2.0 – 3.465V): Transmitter Disabled
Open: Transmitter Disabled
3) Mod-Def 0,1,2. These are the module definition pins. They should be pulled up with a 4.7K –
10KΩresistor on the host board. The pull-up voltage shall be VccT or VccR (see Section IV for
Notes:
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