Conference netcad::hub_mgnt

3339.0. "DECrepeater 90T+ with VXT" by SAWA::WIECZORKOWSK (Krzysztof WIECZORKOWSKI @RPW) Thu Mar 07 1996 13:58

	Hi, 

	I have a problem with loading image to terminal VXT 
	via DECrepeaters 90T+ which are in DEChub 900.
	The fatal configuration is following:

	 		_________________
			| |9| 	|9|	| <---- HW=F,SW=4.1.1
			| |0|   |0|    	|
			| |T|	|T|	|
			| |+|	|+|	|		
		----------| | 	| |-------------------
		|	| | |	| |	|	     |
		|	| ---	---	|	     |	
		|	|		|	     |
		|	|  DEChub 900	|            |
		|	-----------------            |
		|				     |
		|				     |	
		|				------------
	------------------			|	   |
	|    MicroVAX    |			|   VXT	   |
	------------------			| Terminal |
						------------
					     ==================	

	Configuration with two DR 90T+ in DEChub 900 dosen't work correctly,
	it means VXT terminal is not loaded successfully repeating many times
	loading procedure. After 50% or 70% ( sometimes less ) of loading 
	the procedure stops itself with the following messages on uVAX consol:

		1) Timeout/line open error,
		2) MOP function failed,
		3) Write check error.

	A situation is completly different when one of DR 90T+ is removed from
	DEChub 900 - loading of VXT terminal is operating correctly.
	Generally the same situation is observed when VTX terminal is replaced
	by DECserver 90TL or DECserver 900TM - sometimes loading procedure
	is completed ( let's say 1:20 ).
	The DS 90TL image is smaller then VTX and the procedure gets an end 
	easly.   
	What was done hunting for a fault ?
	
		1) DEChub firmware upgrade --> V 4.1.1 - problems
		2) Replacing DECrepeaters 90T+ by another - problems
		3) Cables was replaced - still problems,
		4) Directly conection uVAX<--->VXT works perfectly,
		5) Using DECrepeater 900TM with one DECrepeater 90T+ works also.
 	
	Before DRs 90T+ were installed in DEChub 90 and there was not troubles.
	
	Besides another protocols (DECnet, TCP/IP) work well without any 
	communications problems.	
	
	Does anybody has an idea what is there ? 

	Krzysztof 

    
    	Wild Wag, Would there be a Nemonix Accelerator in the Microvax?
    
    
    					Bill