Rudderow, Evan ([log in to unmask]) wrote:
: Stephanie Evich <[log in to unmask]> asks:
 
: >transports the telnet packets over tcp/ip transport to the DTC Telnet Card
: >receive over tcp/ip where the DTC will convert transport to AFCP (Avesta
: >Flow Control Protocol) to HP?? Does outbound from HP get sent to DTC as
: >telnet over AFCP and converted at card to Telnet/tcp/ip back to client??
   ^^^^^^^^^^^^^^^^
 
I don't mean to pick on anything or anyone, just a thought to correct this
a tiny bit.  Yes, it's all correct that telnet/tcp/ip packet that arrives
in DTC TAC card, gets sent to "mirror backplane" (as far as I remember it
was called), which just 'reflects' the characters that were in telnet packet
- the user data part only - and it gets re-wrapped but this time in ADCP/AFCP
packet and sent to the hp3000.
 
On the way back, (and the correction part) is that there is no "telnet"
traffic out of the hp3000 - just plain fwrites/freads in ADCP/AFCP packets
to the DTC.  The DTC (based on the connection id's in the AFCP packet)
will figure out that the user data in the packet should be 'mirrored' on
top of telnet/tcp/ip stack and sent out again...  Instead of writing the
data to a serial port, the data gets sent to mirror backplane ...which
passes the data on to telnet/tcp/ip stack for transmission....
 
Since I don't work on DTC's, you're entitled to shoot me down...
I realize that it might not be 100% correct...
 
:-) Eero Laurila - HP CSY Networking lab, NS services.