Notes on Digiboard Terminal Servers TS/8 TS/16
A customer who still used old terminals and DOS PC's wanted to
move away from a Frame Relay setup where two remote offices connect
through Digi C/Con serial boxes. They put in Verizon Business DSL
at each office, and we also installed Multitech VPN Routers at each
location, and Digi
Terminal Servers. Digi has made terminal servers for some time,
but the old product looked like the C/Cons while these are smaller
and look more like a switch. The review of the older portserver still
applies with some small differences.
You connect to these serially at 9600 baud (default is root with
password dbps) on any port to login and set the config:
set config ip=192.168.2.10
set config dhcp=off
set config gateway=192.168.2.1
As dhcp is on by default, you could also just telnet to the
Each box will need the gateway set to its router. So, if we have
a three office vpn, we might have 192.168.1.0 as the main office
network, 192.168.2.0 as one branch, and 192.168.3.0 as the other
(see the Multitech review for specifics on setting up the VPN's).
The TS at the first branch would be 192.168.2.10 and its gateway
might be 192.168.2.1.
In addition, the Unix box needs routing - it needs routes for
192.168.2.0 and 192.168.3.0. Those would point at its router:
192.168.1.1 in this case. If it already has a default route
pointing to the router, you of course don't need these. If you
don't understand routing, see Routing
We installed the Digi "RealPort" software and then used
"drpadmin" to assign tty devices to specific ip addresses. This
then lets you use port 3 on the 192.168.2.10 device as (for
example) /dev/ttyg03. You can use stty and "ditty" commands, add
ttyg03 to inittab, etc. - it just assigns fake tty ports to the
device so that it can all be transparent to your software. We made
the assignments match the existing serial setups, so terminals and
printers just automatically worked without reconfiguring
One thing I noticed is that if the TS is reset, it takes a LONG
time before logins work again. I thought things weren't working
because I had no logins even after the devices responded to pings.
A minute or so later everything was fine, so just have
These provide a simple way to transition old systems to a
network. The cost of the terminal servers is less than replacing
the old equipment with PC's. As old terminals and DOS machines are
replaced with new pc's, the customer can leave them connected
serially or connect them with TCP/IP.
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© 2012-11-18 Tony Lawrence