MITSUBISHI (OPTICAL DEVICES)

MF-2500DS-T12-18x/19x/20x/21x

MF-2500DS-R13-18x

MF-2500DS-R14-19x/20x/21x

SONET/SDH TRANSMITTER & RECIEVER

PIN ALLOCATION

Transmitter pin allocation

No.

Symbol

Description

No.

Symbol

Description

1

VEE

Negative power supply ****

24

VCC

Positive power supply ****

2

BACK(+)

Monitoring for back fact current

23

GND

Ground

3

BIAS(+)

Monitoring for LD current

22

Cki-

False clock input

4

SDC

Shut Down Command ***

21

GND

Ground

5

SELC

Clock mode select **

20

Cki+

True clock input *

6

GND

Ground

19

GND

Ground

7

NUC

No user connection

18

Di-

False data input

8

LDA

Laser Degrade Alarm *****

17

GND

Ground

9

NUC

No user connection

16

Di+

True data input

10

NUC

No user connection

15

GND

Ground

11

GND

Ground

14

NUC

No user connection

12

VEE

Negative power supply ****

13

VCC

Positive power supply ****

*: The falling edge of Cki clock input signal is at the Di data eye pattern crossing point.

**: When open (or low) the module is in the operating mode. When high the module operates in non

clocked mode.

***: When high the module in the shut down mode (no optical output power).

When open (or low) the module is in the operating mode.

****: Vcc-Vee; with Vcc at +5V Vee must be at 0V; with Vee at -5.5V Vcc must be at 0V

*****: When provided a digital alarm indicates that the laser is degraded.

The active level is a low level.

This pin must be teidto Vcc through a 100k ohm resistor when the digital alarm is not proved

Receiver pin allocation

No.

Symbol

Description

No.

Symbol

Description

1

HV / NIC

High Voltage *

24

NUC

No user connection

2

NUC

No user connection

23

OILV / NIC

Optical Input Light Voltage ##

3

LPA

Loss of Power Alarm ***

22

VCC

Positive power supply

4

GND

Ground **

21

NUC

No user connection

5

Cko-

False clock output

20

GND

Ground **

6

Cko+

True clock output

19

GND

Ground **

7

GND

Ground **

18

VEE

Negative power supply

8

VCC

Positive power supply

17

GND

Ground **

9

GND

Ground

16

GND

Ground **

10

Do+

True data output

15

GND

Ground **

11

Do-

False data output

14

GND

Ground **

12

GND

Ground **

13

DTV / NIC

Decision Threshold Voltage #

*: This pin is Not Internally Connected(NIC) in case of the high voltage generator is inside the module.

**: Package is at same potential as GND .

***: LPA output is a logic level that indicates the presence or absence of a sufficient optical input level.

A logical high level indicates an input optical level too low.

#: This pen is not internally connected if the amplitude decision threshold is not made adjustable.

##: This pen is not internally connected if the Optical Input Light Voltage functionality is not provided.