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Chapter 2 23
Networking Concepts
Network Environment Design Considerations
use a Point-to-Point network if the distance between some nodes on the
network will be greater than the maximum distance allowed between
nodes on a LAN. Bridges, hubs and routers are commonly implemented
to extend LANs.
FDDI networks also offer greater distances than LAN, Token Ring,
100VG-AnyLAN, or 100Base-T networks. FDDI networks can be up to
200 kilometers in length, with nodes up to 2 kilometers apart.
If you need to connect nodes that are geographically distant (for
example, HP e3000s located in different cities) you might choose to
connect them via a dial link. For NS dial links, you can use the
Point-to-Point 3000/iX Network Link.
Finally, if you need to use satellite transmission because of the large
geographical distance between nodes, or if you need to have access to
other nodes on a public or private X.25 network, you might wish to use
the DTC/X.25 iX Network Link.
Special Cases
The following sections describe certain design requirements for special
situations, such as shared dial links, personal computers, and using
non-HP e3000 minicomputers on an NS network.
Shared Dial Links
Shared dial links have two limitations that must be considered when
designing a network. First, a shared dial link cannot be used as an
intermediate link in a Point-to-Point network. Any other kind of dial
link can be used for intermediate links, but shared dial links can be
used only to connect leaf nodes (that is, nodes that receive messages
targeted only for themselves, also referred to as end nodes). Second,
cannot dial out on SMUX, shared dial links cannot be used as gateway
halves.
Non-HP e3000 Nodes (Including PCs)
LAN, Token Ring, FDDI, 100VG-AnyLAN, 100Base-T, and X.25
networks can access non-HP e3000 nodes. Point-to-Point networks
must be composed of only HP e3000s.
Applicable SYSGEN Parameters
VT terminals are not physical devices, instead they are virtual devices
created dynamically at remote logon, header entries are created for the
maximum number of VT terminals at system boot time. The exact
number of head entries created for VT terminals will depend on the
value of MAXDYNIO (which is configurable in SYSGEN).
The exact number of remote sessions which can be supported on a given
system will depend on the exact mix of jobs and sessions (remote and
local, active and inactive) on that system.