Delta Electronics Network Device LCP-1250 Specification page 5

Pin Function Definitions
Pin Num. Name
1 VeeT
2 TX Fault
3 TX Disable
4 MOD-DEF2
5 MOD-DEF1
6 MOD-DEF0
7 Rate Select
8 LOS
9 VeeR
10 VeeR
11 VeeR
12 RD-
13 RD+
14 VeeR
15 VccR
16 VccT
17 VeeT
18 TD+
19 TD-
20 VeeT
Plug Seq.: Pin engagement sequence during hot plugging.
Notes:
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):
(>0.8, < 2.0V):
High (2.0 – 3.465V):
Open:
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 further
details). Mod-Def 0 is grounded by the module to indicate that the module is present Mod-Def 1 is the
clock line of two wire serial interface for serial ID Mod-Def 2 is the data line of two wire serial interface
for serial ID
4) LOS (Loss of Signal) is an open collector/drain output, which should be pulled up with a 4.7K – 10KΩ
resistor. Pull up voltage between 2.0V and VccT, R+0.3V. When high, this output indicates the
received optical power is below the worst-case receiver sensitivity (as defined by the standard in use).
Low indicates normal operation. In the low state, the output will be pulled to < 0.8V.
5) VeeR and VeeT may be internally connected within the SFP module.
6) RD-/+: These are the differential receiver outputs. They are AC coupled 100Ω differential lines which
should be terminated with 100Ω (differential) at the user SERDES. The AC coupling is done inside the
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Function
Transmitter Ground
Transmitter Fault Indication
Transmitter Disable
Module Definition 2
Module Definition 1
Module Definition 0
Not Connect
Loss of Signal
Receiver Ground
Receiver Ground
Receiver Ground
Inv. Received Data Out
Received Data Out
Receiver Ground
Receiver Power
Transmitter Power
Transmitter Ground
Transmit Data In
Inv. Transmit Data In
Transmitter Ground
Transmitter on
Undefined
Transmitter Disabled
Transmitter Disabled
Plug Seq.
1
3 Note 1
Note 2
3
Module disables on high or open
3 Note 3, 2 wire serial ID interface
3 Note 3, 2 wire serial ID interface
3 Note 3, Grounded in Module
3 Function not available
3 Note 4
1 Note 5
1 Note 5
1 Note 5
3 Note 6
3 Note 7
1 Note 5
2 3.3 ± 5%, Note 7
2 3.3 ± 5%, Note 7
1 Note 5
3 Note 8
3 Note 8
1 Note 5
5
Notes
Nov., 2006
Rev. 6B
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