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3com S24x Manual De Usuario

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About the PathBuilder S24x, 26x, and 27x switch 
1-29
Hardware Components
Setting Jumpers for DSPM Card with Analog E&M Interface 
Introduction
The DSPM/EM card has a total of 12 jumpers that you can set for various 
applications if required: 
• Ten jumpers for two- or four-wire operation
• Two jumpers for MVIP clock termination (not used at present)
Default Jumper 
Settings
The DSPM/EM card ships from the factory with the ten jumpers for two- or 
four-wire operation set to four-wire.
Jumper Definitions
Jumpers J11 through J15 are associated with Port 1. 
Jumpers J21 through J25 are associated with Port 2.
Jumper 
Number
4-Wire/600
2-Wire/600
2-Wire/UK 
Complex
2-Wire/
Germany 
Complex
J11
600
600
COM
COM
J12
4W
2W
2W
2W
J13
Don’t Care 
(Default 
Germany)
Don’t Care 
(Default 
Germany)
UK
Germany
J14
600
600
COM
COM
J15
4W (removed)
2W (installed)
2W (installed)
2W 
(installed)
Jumper 
Number
4-Wire/600
2-Wire/600
2-Wire/UK 
Complex
2-Wire/
Germany 
Complex
J21
600
600
COM
COM
J22
4W
2W
2W
2W
J23
Don’t Care 
(Default 
Germany)
Don’t Care 
(Default 
Germany)
UK
Germany
J24
600
600
COM
COM
J25
4W (removed)
2W (installed)
2W (installed)
2W 
(installed)