202

FIBER OPTIC CABLE LENGTH – km

4

2

0.5

8

1

0

6

02

1.5

1

3

5

7

62.5/125 µm

50/125 µm

Each transmitter and receiver

package includes an internal shield

for the electrical subassembly to

ensure low EMI emissions and high

immunity to external EMI fields.

The outer housing, including the

ST* port, is molded of filled, non-

conductive plastic to provide

mechanical strength and electrical

isolation. For other port styles,

please contact your Hewlett-

Packard Sales Representative.

Each data-link module is attached

to a printed circuit board via the

16-pin DIP interface. Pins 8 and 9

provide mechanical strength for

these plastic-port devices and will

provide port-ground for forthcom-

ing metal-port modules.

Application Information

The Applications Engineering

group of the Optical Communi-

cation Division is available to assist

you with the technical understand-

ing and design tradeoffs associated

with these transmitter and receiver

modules. You can contact them

through your Hewlett-Packard

sales representative.

The following information is

provided to answer some of the

most common questions about the

use of these parts.

Transmitter and Receiver

Optical Power Budget

versus Link Length

The Optical Power Budget (OPB)

is the available optical power for a

fiber-optic link to accommodate

fiber cable losses plus losses due to

in-line connectors, splices, optical

switches, and to provide margin for

link aging and unplanned losses

due to cable plant reconfiguration

or repair.

Figure 4 illustrates the predicted

OPB associated with the trans-

mitter and receiver specified in this

data sheet at the Beginning of Life

(BOL). This curve represents the

attenuation and chromatic plus

modal dispersion losses associated

with 62.5/125

µm and 50/125 µm

fiber cables only. The area under

the curve represents the remaining

OPB at any link length, which is

available for overcoming non-fiber

cable related losses.

Hewlett-Packard LED technology

has produced 1300 nm LED

devices with lower aging character-

istics than normally associated with

these technologies in the industry.

The industry convention is 1.5 dB

aging for 1300 nm LEDs; however,

HP 1300 nm LEDs will experience

less than 1 dB of aging over

normal commercial equipment

mission-life periods. Contact your

Hewlett-Packard sales represen-

tative for additional details.

Figure 4 was generated with a

Hewlett-Packard fiber-optic link

model containing the current

industry conventions for fiber

cable specifications and Fibre

Channel optical parameters. These

parameters are reflected in the

guaranteed performance of the

transmitter and receiver specifica-

tions in this data sheet. This same

model has been used extensively in

the ANSI and IEEE committees,

including the ANSI X3T9.5

committee, to establish the optical

performance requirements for

various fiber-optic interface

standards. The cable parameters

used come from the ISO/IEC JTC1/

*ST is a registered trademark of AT&T Lightguide Cable Connectors.

Figure 3. Pinout Drawing.

Figure 4. Optical Power Budget at

BOL vs. Fiber Optic Cable Length.

NC

8

9NC

GND

7

10

NO PIN

VCC

6

11

GND

VCC

5

12

GND

GND

4

13

GND

DATA

3

14

GND

DATA

2

15

VBB

NC

1

16

NC

OPTICAL PORT

TRANSMITTER

NC

8

9NC

NO PIN

7

10

GND

GND

6

11

VCC

GND

5

12

VCC

GND

4

13

VCC

SD

3

14

DATA

SD

2

15

DATA

NO PIN

1

16

NC

OPTICAL PORT

RECEIVER