Expand Configuration and Management Manual (H06.21+, J06.10+)

Glossary
Expand Configuration and Management Manual — 529522-013
Glossary - 9
packet
packet. A block of information that contains fields for addressing, sequencing of information,
priority indicators, and a portion of a message or an entire message. See also Expand
frame.
packet header. The portion of an Expand frame that contains control information added by
the Expand line-handler process. By default, D20 and later Expand frames use an
extended packet header format of 64 bytes.
passive connect request. A connect method that can be used by an Expand line-handler
process when it tries to establish an end-to-end connection. When an Expand-over-
NAM line-handler process issues a passive connect request, the network access
method (NAM) waits for an incoming connect request. When an Expand-over-IP or
Expand-over-ATM line-handler process issues a passive connect request, it waits for
an incoming Connect Command frame from the remote Expand-over-IP or Expand-
over-ATM line-handler process. See also active connect request and network access
method (NAM).
passthrough routing. A routing scheme used by the Expand subsystem that permits
intermediate nodes to route, or passthrough, data packets to the destination system.
This scheme reduces the number of lines required between systems because systems
do not have to be directly connected.
passthrough traffic. Packets received from a remote node that are destined for another
remote node. See also passthrough routing.
path. One or more lines between two adjacent nodes. See also route and best-path route.
path function. One of the two functions of an Expand line-handler process. A single-line
Expand line-handler process performs both path and line functions with a single logical
device. A multi-line path requires a logical device to manage the path function and a
separate logical device for each line in the path.
path logical device. A logical device that manages the path function for a multi-line path.
persistence. The capability of a generic process to restart automatically if it was stopped
abnormally.
persistence manager. A process named $ZPM that starts generic processes and manages
their persistence.
physical unit (PU). In the Systems Network Architecture (SNA), the component that
manages and monitors the resources of a node.
profile. A disk file containing modifiers and default values. On NonStop NS-series servers, a
profile is required when configuring a device. HP provides profiles for the different
types of Expand line-handler processes. You can create your own customized profile
using the SCF interface to the WAN subsystem (ADD PROFILE command). You can
also alter profile modifier values for a particular device using the SCF interface to the