edition - HP Computer Museum

HP 3000 Series
262X 263X 264X
Family Family Family Others
2621AlP 2635B 2644B 2382A
2622A
2642A
2623A 2645A HP 125
2624B
2648A
2626A
Figure 2
HP Terminals supported over X.25 Networks in
character mode.
the volume of data the user transmits
through the network. In addition,
higher communications reliability
results due to the built-in
alternate communication lines
within the PSN.
All the features of DSNIDS for HP
3000 computers are available over
X.25 PDN's, including communication
to HP 1000 computers.
Moreover, DSNIDS networks can
contain both X.25 connections and
point-to-point connections in the
same network requiring no user
programming modifications.
In addition to host-to-host communications
over X.25 Public Data
Networks (PDN's) DSNIDS allows
asynchronous character-mode terminals
to communicate with HP
3000s via the X.3lX.28lX.29 standards
(see figure 2). This allows terminal
users to access any I-IP 3000
over the X.25 network, providing
distant terminals with a cost alternative
to dial-in or leased line access.
The remote terminal connects
first to a PDN facility called a PAD,
(usually by a local phone call) and
then attaches to the desired HP
3000 system across the X.25 network.
These terminal-to-system
connections can take place concurrently
with system-to-system communication
over the same physical
link between the HP 3000 and the
X.25 network.
For additional information regarding
the X.25 capability for the HP
3000 computer family, refer to the
HP 3000 Data Communications
Products Specification Guide, pgs
1 - 10 (PIN 5953-7444) and the DSNI
DS for the HP 3000 Reference Manual
(PIN 32190-90001)
* Operating DSNIDS on a Public
Data Network requires that HP,
and in some cases the PDN administration,
certify the DSNIDS
implementation on that network.
In addition, it is the customer's
responsibility to determine if
gateway services exist between
various PDN's. For status on
certification with PDN's not
listed here, consult your
sales rep.
Multipoint
Enhancements
In the past, many of you have requested
a variety of enhancements
for DSNIMTS. such as: easier cabling
convenience and installation,
more application subsystem support,
less expensive terminals, and
remote spooled printing.
All of these requests reflect customers'
applications where they
would like to set up a work environment
using theAmultipoint protocol.
Typically, multipoint protocol
is utilized when the environment
is physically far removed
from the HP 3000. In many instances,
this is the remote workstation
that consists of terminals
and printers with application subsystem
needs. IND, Grenoble, and
Boise together are introducing software
enhancements and hardware
products that will satisfy these
needs.
Problem: How to access the remote
site while ensuring data integrity
and remaining cost effective.
Solution: DSNlMultipoint
software.
Multipoint software provides a degree
of data integrity that is suitable
for remote configurations. Multipoint
performs error checking on
transmitted data. If the data is corrupted
during transmission, it is
automatically retransmitted. Thus,
customers are ensured the data
they are receiving is correct.
When configuring multipoint,
multiple terminals can be connected
to a single communication
line, whether local or remote.
When configuring at a physically
remote site, the need for more than
one pair of modems is eliminated.
~heie is a great cost savings here
- one pair of modems provides
your customer the connection for
multi~le devices. If there are sev-
1
era1 remote sites, these modems
can be multidropped, creating a
network that would be the most
cost effective for vour customer.
For a local site where terminals are
widely distributed throughout the
facility, DSNlData Link provides a
hardwired connection using the
same multipoint protocol.
Since DSNlMultipoint provides the
access to the remote configuration
(far removed from the system),
how does one configure terminals
Problem: How to configure a remote
site, inexpensive terminals
that provide for cabling convenience,
character and block modes,
and application subsystem support
on the HP 3000.
Solution: The HP 2333A Multipoint
Cluster Controller.
The Multipoint Cluster Controller
is configured using multipoint software.
The HP 2333A provides cluster
control for up to 16 terminals
and these terminals can be inexpensive
point-to-point terminals
that do not require multipoint interfaces
(e.g. 262X, 264X, 238X,
HP 125). The 2333A creates a simulated
point-to-point environment
Computer News OEM Edt~on
1 4 January, 1983