GarrettCom DS60s Manual De Usuario

Magnum DS50 / DS60s Dual Speed Hubs                  Installation and User Guide (06/02)

 

5. 

The LINK LED for the fiber connector will illuminate when a proper connection has 
been established at both ends (and when power is ON in the unit). If LINK is not lit 
after cable connection, the normal cause is improper cable polarity.  Swap the fiber 
cables at the fiber connector to remedy this situation. 

When using single-mode fiber cable, be sure to use single-mode fiber port 

connectors.  Single-mode fiber cable has a smaller diameter than multi-mode fiber cable (9/125 

microns for single-mode, 50/125 or 62.5/125 microns for multi-mode where xx/xx are the 

diameters of the core and the core plus the cladding respectively). Single-mode fiber allows full 

bandwidth at longer distances, about 20Km with the single-mode SC. 

The same procedures as for multi-mode fiber apply to single-mode fiber connectors.  

Follow the steps listed in Section 3.2.2 above. 

Receiver Sensitivity and Transmitter Power are the parameters necessary to compute 

the power budget. To calculate the power budget of different fiber media installations using 
Magnum products, the following equations should be used: 
OPB (Optical Power Budget) = P

T

(min) - P

R

(min) 

          

 where P

T 

 = Transmitter Output Power, and P

R

 =  Receiver Sensitivity 

 
     Worst case OPB = OPB - 1dB(for LED aging) - 1dB(for insertion loss) 
     Worst case distance = {Worst case OPB, in dB} / [Cable Loss, in dB/Km] 
where the “Cable Loss” for 62.5/125 and 50/125

µm

 (m.m.) is 2.8 dB/km,   

 

and the “Cable Loss” for 100/140 (Multi-mode) is 3.3 dB/km, 

 

and the “Cable Loss” for 9/125 (Single-mode) is 0.5 dB/km 

 
The following data has been collected from component manufacturer’s (HP’s and Siemens’) 
web sites and catalogs to provide guidance to network designers and installers. 
 

µm 

DS60F- 

xMSC 

FX 

Multi-

mode 

2 

(0.4) 

1300

62.5/125

50/125 

-20 

-23.5 

-31 

-31 

9.0 

5.5 

2.5 

2.0 

14 

12 

5 

4 

DS60F- 

xSSC 

FX 

Single-

mode 

20 

(0.4) 

1300

9/125 

 

   

 

 

-15

-31

14

28

17.5

35 

“Long  

Reach” 

FX 

Single-

mode 

40   

(0.4) 

1300

9/125   

   

 

 

 

-5

-34

27

54

32.5

65

• 

• 

21 

.

.