| Title: | FDDI - The Next Generation | 
| Moderator: | NETCAD::STEFANI | 
| Created: | Thu Apr 27 1989 | 
| Last Modified: | Thu Jun 05 1997 | 
| Last Successful Update: | Fri Jun 06 1997 | 
| Number of topics: | 2259 | 
| Total number of notes: | 8590 | 
    
    
    Hi,
    
    The FDDI PID mentioned that the external bypass switch can be ordered
    from AMP and the jack of the switch is MMJ.  However, I have checked
    with AMP that they only provide the following three types of
    interfaces:
    
    1. Modular Plug
    2. DIN
    3. MTE Receptacle
    
    so none of them is MMJ.  So what can we use ?  Does anyone know the AMP
    part no. ?
    
    What patch cable (from AMP to our DECbridge/DECconcentrator) should we
    use ?  Pin-to-Pin or Cross-over (how) ?
    
    Thanks in advance.
    
    
    Kin
    
| T.R | Title | User | Personal Name | Date | Lines | 
|---|---|---|---|---|---|
| 435.1 | DECbridge 620 manual | PRSSOS::GROSSETETE | Thu Jan 02 1992 06:48 | 23 | |
|     	On a DECbridge 620, the Optical Bypass connector is MJ (RJ12)
    not MMJ.
    	You could find the connector pinout in the DECbridge 620
    installation manual. I copied below the pinout from the manual.
    
    			    Pins
    			6 5 4 3 2 1
    		       +-----------+
    		       |           |
    		       |           |
    		       +--+     +--+
    			  |     |
    			  +-----+
    
    	Pin 	Description
    	1,2	Relay drive, +5V @200 mA (max)
    	3,4,6	Return, grounded internally
    	5	Bypass present, must be externally grounded to pin 3,4 or 6
    
    	I don't know any P/N available for a cable
    
    	Patrick
     
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