HP 3000 Manuals HP 3000 Manuals
Modem Type Selection on the DTC
by Bob Potterveld--Information Networks Division
The DTC offers two types of modem control logic on MPE XL systems. One
for the needs of U.S. based customers and one for the needs of
Europe/International customers. The two available modem types are
called:
US modem type and European modem type
The modem type is an option configurable in each DTC profile. The
choices for this option are: zero (0) for no modem control; one (1) for
the US modem type; and two (2) for the European modem type.
Each modem type provides functionality that is available on MPE V
systems. The US modem type is functionally equivalent to SUBTYPE 1 ATP
connections. The European modem type is functionally equivalent to
SUBTYPE 9 ATP connections.
The difference between these two types is in their use of the
clear-to-send (CTS) RS232 signal. DTC ports defined as US modem types do
not monitor CTS. These ports do not need CTS to be present from a modem
device for the port to be active.
The European modem type requires CTS to be present before the DTC port
can become active. Also, if CTS ever drops, the session associated with
that port will be aborted. Most European PTTs require CTS to be
monitored, hence, the need for the European modem type.
Which modem type do you choose? The following table defines MPE V
subtypes and migration of these subtypes to MPE XL. Find the subtype that
is currently used on MPE V and configure DTC profiles to use the
appropriate modem type. Two sample profiles are provided that use the US
modem type and the European modem type. These are called TR10U12 and
TR10E12. The 'U' stands for US modem type and the 'E' stands for
European modem type. These two profiles use terminal type 10 and operate
at 1200 baud. On the HP 3000 Series 930, you can find the profiles
in the sample configuration files called NMSAMPXL.PUB.SYS and
NMSAMPDT.PUB.SYS; on the HP 3000 Series 950, you can find the profiles
in the sample configuration files called NM950XL.PUB.SYS and
NM950DT.PUB.SYS.
MPE V to MPE XL Subtype Migration Table
MPE V Subtype MPE XL Modem Type
1,5,10,11,15 1 - US modem type
9,13 2 - European modem type
all others 0 - No modem control