Conference netcad::hub_mgnt

389.0. "SDLC Transport questions" by NMOSPD::SYSTEM () Thu Sep 16 1993 09:21

	Hi. (yes i know to much questions....please help if you can)

	Four questions about integration of one multipoint connection, 
	in SNA network, with "SDLC Transport function" and "local termination 
	feature", using an IP network and DECBrouter 90.
	
	Following the old configuration, the new suggested configuration 
	and related questions.

			************************
			OLD SAMPLE CONFIGURATION
			************************

		    To Host Processor
			   /\
			  /  \
			   ||
		      ------------------
		      |IBM Comunication|
		      |   Controller   | Primary SDLC station
		      |      3725      |
		      ------------------
			    |
		      (T.L.)|	 ---------- Secondary SDLC station
			    |	 |  IBM   | SDLC addr. C1
			    |----|Terminal| (PU type 2 with LU type 2 and 3)
	|--------------->   |	 | 3274	  | (It's a BANCOMAT)
	= Connect 30-40	    | 	 ----------
	  IBM terminal in   |
	  different sites   |	 ---------- Secondary SDLC station
			    |	 |  IBM	  | SDLC addr. C2
			    |----|Terminal| (PU type 2 with LU type 2 and 3)
			  	 | 3274	  | (It's a BANCOMAT)
			    	 ----------

	Legend:
	=======
		T.L.    Telephone Line (SDLC Multipoint, Full Duplex and NRZI)

			************************
			NEW SAMPLE CONFIGURATION
	    		************************

      To Host Processor
	     /\
	    /  \
	     ||			      Node A
	--------------	    	    |----------|
	|IBM Comunic.|	 (T.L.)	 S0 |DECBrouter|
	|Controller  |-----//-------|   90     |
	|    3725    |		    |----------|
	--------------		         |E0
	(SDLC Primary Stat.)		 |
					 |             Ethernet LAN
	===========================================================
			|
			|
		   -------------		
		   | IP Router |			  
		   -------------			  
			|			
	            	|			 Node B	
		****************************	---------
	        *	                   *  S0|  DEC  |
		*	IP NETWORK 	   *----|Brouter| (M.E.)  ----------
		*			   *    |  90   |---//----|  IBM   |
		****************************	---------S1       |Terminal|
				|			          |  3274  |
				|				  ----------
				|		 	      (SDLC addr C1,
	                  -------------			       Secondary Stat.)
 	                  | IP Router |			
        	          -------------
 				|
				|			    Ethernet LAN
	================================================================
						       |
						       |E0
			----------		--------------
			|  IBM	 |    (M.E.)  S0| DECBrouter |
			|Terminal|-----//-------|    90      |
			|  3274  |		--------------
			----------		   Node C
			(SDLC addr C2,
			 Secondary Stat.)		      


	Legend:
	=======
		M.E.    Modem Eliminator (DCE) 
		T.L.	Telephone Line (SDLC multipoint, Full Duplex and NRZI)
		S0	Interface Serial 0
		S1	Interface Serial 1
		E0	Interface Ethernet 0


			*************
			THE QUESTIONS
			*************

	1- Can I use the DECBrouter-90 like a DCE or is it a DTE device 
	   therefore I must to use Modem Eliminator to connecting IBM 
	   devices (DTE)? (In the CISCO AGS+ interfaces I can buy one DCE
	   aplique which change one DTE interface into DCE)
	2- Is it supported NRZI and NRZ for SDLC Transport Function?
	   (usualy, in italian SNA implementation, we use NRZI)
	3- What is the minimum supported speed for the syncronous
	   interface in the DECBrouter-90? (I suppose maximum speed
	   is up to T1/E1 and up to 64 Kbaud for DECBrouter-90/T2 when the 
	   ports running simultaneously and if i use only one port can be 
	   up to T1/E1) 
	4- How many, reasonably, secondary station can i configure in the
	   DECBrouter-90 "Node A" S0 interface? (because i think to setup one 
	   "STUN ROUTE ADDRESS address-number TCP ip-address LOCAL-ACK" 
	   for each secondary SDLC remote station)       
	   
	
	Many thanks.

	Andrea Mattioli

	P.S. DO YOU THINK IT WORKS?
	     ======================