V23818-K305-Lxx

Application Notes

Data Sheet

11

2003-01-22

Application Notes

Small Form Factor Pinning Comparison

The drawing below gives you a comparison between the different pinnings 2x5, 2x6,

2x10. Dimension for diameter and distance of additional pins is similar to the existing

dimensions of the other pins.

Figure 5

Pin Description

RS pin - The RS (Rate Select) is not connected.

LF pin - The LF pin (Laser Fault) is an LVTTL output of the Laser Driver Supervisor

Circuit. A Logic 1 level can be measured in case of a laser fault. It will not show

a fault if the laser is being disabled using the TxDis input, since this is not a fault

condition.

EMI-Recommendations

To avoid electromagnetic radiation exceeding the required limits please take note of the

following recommendations.

When Gigabit switching components are found on a PCB (multiplexers, clock recoveries

etc.) any opening of the chassis may produce radiation also at chassis slots other than

that of the device itself. Thus every mechanical opening or aperture should be as small

as possible.

On the board itself every data connection should be an impedance matched line (e.g.

strip line, coplanar strip line). Data, Datanot should be routed symmetrically, vias should

be avoided. A terminating resistor of 100

W should be placed at the end of each matched

Top view

Rx

Tx

RxCLK

− 4

RxCLK+ 5

SD 8

RxD

− 9

RxD+ 10

RS 1

SD 4

RxD

− 5

RxD+ 6

SD 3

RxD

− 4

RxD+ 5

20 PMON+

19 PMON

−

18 BIASMON+

17 BIASMON

−

15 TxD

−

14 TxD+

13 TxDis

12 Laser Fault

11 TxD

−

10 TxD+

9 TxDis

10 TxD

−

9 TxD+

8 TxDis

2 x 5

2 x 6

2 x 10

File: 1506