Conference ozrock::x25_osf

        
>>        1) Is PBXDP supported on AlphaSever 4100 running Digital UNIX?
  
Yes.
      
>>        2) Data communication is based on HDLC protocol, which software 
>>           driver is better for this case?   WAN Support for Digital 
>>           UNIX System V2.0A (SPD 42.47) or DECnet/OSI V4.0 for Digital 
>>           UNIX (SPD 41.92)?  Is there HDLC APIs, which support       
>>           network programming to PBXDP?
  
WAN Support for Digital UNIX System V2.0A is the only software you require
for this.

There are HDLC APIs.  The WDD Programmer's reference contains more details.
      
>>        3) The performance requirements for PBXDP are to receive 1000 
>>           data frame/sec and to send 500 data frame/sec simulatenously,
>>           one data frame is 100 bytes in maximum.  Is the communication 
>>           capacity of PBXDP able to meet these requirments?      
  
This is a definite maybe!  Looking at the numbers your system will be required
to process more than 1500 interrupts per second and run the lines between 1-2 Mb/s.
I don't see any problems with that, as long as your aware of the other activity on
your system.

Naturally, you will need to use V.35 or X.21 type interfaces for these speeds.

Matt.

>>>        1) Is PBXDP supported on AlphaSever 4100 running Digital UNIX?
>  
>Yes.

I have a question about PBXDP too. It isn't support AlphaStation 255/233
but 255/300 (viewing Option Catalog). Why ?

Customer uses PBXDI on AS 255/233. However 255/233 will retire soon, 
customer must shift to 255/300.  Or they must choose PBXDP with AS 500.
(AS500 has no ISA slot!)

Any solutions?

Best regards,

Hiroomi Morishita
OEM Support, Japan

Actually the PBXDP is supported on all systems with a PCI bus.

There is big problem in keeping the documentation up to date.  There is
no process for doing this as new machines are created.

I'm not sure why you customer needs to upgrade when the 255/233 is retired,
it sounds a little unnecessary to me.  But as I say, they can use the PBXDP
on any PCI system, so they won't have a problem.

Cheers,
MAtt.

    One features of PBXDP is provide linde speeds up to 5Mbps.   When 4
    ports or 8 ports used, can every prot support this high speed
    simulatenously?   
    
    Where could I get the PBXDP hardware manual and DEC WAN Device Drivers
    for Digital UNIX--Application Programmer's Guide?  I really need these 
    two documents because my customer has many questions about HDLC
    programming and PBXDP performance.
    
    Thanks & Regards
    
    Sylvia

    > One features of PBXDP is provide linde speeds up to 5Mbps.   When 4
    > ports or 8 ports used, can every prot support this high speed
    > simulatenously?
    	Depends: on frame arrival rate; what else the processor is doing
    etc etc. On VMS on an AlphaStation 400 using X.25 with two PBXDP lines
    connected back-to-backat 2Mbps  and both lines both sending and receiving 
    the same data, the system runs out of CPU power for packet sizes below 
    about 1k but has plenty of available CPU power for packet sizes above
    1k (the larger the packet size the more CPU power available). I
    wouldn't expect a UNIX system to behave markedly differently.
    
    To give some extremes: Can an AlphaStation400 handle 8 PBXDP ports full
    duplex, 32 bytes frames on 5Mbps lines with minimum frame gap? Highly
    unlikely!
    
    Can an AlphaStation 400 handle 8 PBXDP ports full duplex, 4096 byte
    frames on 5Mbps lines with a frame arrival and transmission rate 
    of no more than 100 frames/sec (aggregate)? Shouldn't be any problem.
    
    It highly likely the real traffic will be unlike either of these cases.
    Perhaps a heftier system than an AlphaStation400 is being considered.
    
    If you can give some sort of description of the real application I
    could comment further.
    
    The WANDD Programmers Guide should be included in the doc set. The
    pointers to the kits (see early notes: 2 or 3 or 4) should also
    include (at least for EFT kits) pointers to electronic forms of
    documentation. I can't see that you would need a "PBXDP hardware
    manual" unless you want to write a device driver for it; but maybe I
    have a different concept of "hardware manual".
    
    

    
    
    
    Thanks Arthur.
    
    Before, the product descriptoin for communication card will indicate
    something like the following:
    	1 port used, support speed up to 5Mbps/sec 
    	2 ports used, each support speed up to 2.5Mbps/sec
        4 ports used, each support speed up to 1.25Mbps/sec
        ... 
    
    Now, I just want to know these.  If you happen to know the pointer of
    hardware manual of PBXDP and WAN Device Drivers for Digital UNIX, please 
    tell me.  If possible, I would like to read manual myself firstly and to 
    try to answer my customer's questions.  In addition, I checked the 
    directory OILS::/public/product/x25_for_osf/v1.3/SSB/doc, and didn't find 
    the WAN Device Dirvers for Digital UNIX manual.  
    
    Thanks & Regards
    
    Sylvia 

    The hardware will supposedly support 8 lines full duplex at 5Mbps per
    line. The software may or may not be able to handle such traffic; it
    depends on the frame arrival rate and how long that rate is sustained.