SWITCH.DOC

	Quick reference  PCA 16/4 Token-Ring Adapter  switches.


         SWITCH 8-1
	Ŀ
	     п            
	        Ŀ   
	   Ŀ       
	                       UTP connector
	            ٳ       (Unshielded Twisted Pair)
	                  ¶
	                	
	             Ŀ
	                          STP connector  
	 Ŀ               (Shielded Twisted Pair)  
	   RPL             
	  SOCKET             
	             
	Ŀ                 ٺ
	      
	      
	                         


Switch #  1         2,3          4,5        6..8       

        Ring      I/O Address  Interrupt  RPL Address  
        Speed     Select       select     select       
		  
	 |	      |		  |	     |	
	 |	      |		  |	  ___|___
	 |	      |		  |	 /       \
	 |	      |		  |     14   15   16
	 |	      |		  |	
	 |	      |		  |	off  off  off   RPL disabled  *
	 |	      |		  |	on   off  off   C6000
	 |	      |		  |	off  on   off   CA000
	 |	      |	       	  |	on   on   off   CE000
	 |	      |	       	  |	off  off  on    D2000
	 |	      |	       	  |	on   off  on    D6000
	 |	      |	       	  |	off  on   on    DA000
	 |	      |	       	  |	on   on   on    DE000
	 |	      |		  |	 
	 |	      |		  |    Location of 8 K address space for RPL
	 |	      |		  |    PROM. The PROM can be placed on any 
	 |	      |		  |    16 K boundary from C6000 to DE000.	 
	 |	      |	       	  |
	 |	      |	       
	 |	      |	       I0   I1	 
	 |            |	       off  off	Interrupt level 9/2  *
	 |	      |	       on   off Interrupt level 3  (Note 1)
	 |            |	       off  on  Interrupt level 5  (Note 2)
	 |	      |	       off  off Interrupt level 7  (Note 3)
	 |	   
	 |	   A0   A1
	 |	   off  off  A20-A23, A30-A3F  *
	 |	   off  on   A24-A27, A40-A4F
	 |	   on   off  A50-A53, A60-A6F
	 |	   on   on   A54-A57, A70-A7F

	SP
	off   4 Mbps  *
	on   16 Mbps


	Notes:
	*	denotes default switch postion

	(1)	COM2 (if present) normally uses interrupt level 3

	(2)	If LPT2 is configured to use interrupts, level 5 will
		normally be in use.

	(3)	If LPT1 is configured to use interrupts, level 7 will
		normally be in use.

