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

Glossary
Expand Configuration and Management Manual — 529522-013
Glossary - 2
congestion control
congestion control. A feature that allows you to control system resources to avoid network
bottleneck and resource contention situations. You can enable or disable congestion
control using the Expand subsystem SCF ALTER PATH command or the WAN
subsystem SCF ALTER DEVICE command.
control block pool. A portion of the Expand line-handler process data space that contains
control blocks. A control block is allocated for each node in the network.
direct-connect line-handler process. An Expand line-handler process that implements the
High-Level Data Link Control (HDLC) Normal protocol. This type of Expand line-
handler process is provided for use with conventional voice-grade leased and
switched-line facilities, private facilities, and Transmission Group 1 (T1) facilities.
distance vector (DV) message. An Expand network control process ($NCP) message that
gives the time factor (TF) and hop count (HC) from the system originating the distance
vector (DV) message to the node named in the message.
DV message. See distance vector (DV) message.
effective time factor (ETF). An extension of the path time factor (TF) that is used to select
a path in a multi-CPU path. The ETF represents not only the speed of the path, but
also the resources available on the path to accommodate more traffic. The ETF
indicates the inverse proportion of traffic that should be sent over the path compared to
an unloaded path with a TF of 1. Therefore, a path with a TF of 6 reports an ETF of 12
when it is half loaded. See also multipacket frame.
End-to-End protocol. An HP proprietary protocol implemented by the Expand line-handler
process that provides functions similar to some of those defined by the OSI Session
Layer, Transport Layer, and Network Layer.
ETF. See effective time factor (ETF).
Ethernet 4 ServerNet Adapter (E4SA). A ServerNet adapter for Ethernet local area
networks (LANs) that contains four Ethernet ports.
Expand frame. A unit of data, consisting of control information and user data, that is
transmitted by an Expand line-handler process. An Expand line-handler process
fragments application messages into Expand frames. The size of an Expand frame is
determined by the FRAMESIZE modifier. The frame size must be the same for every
Expand line-handler process in the network.
Expand line-handler process. A process pair that handles incoming and outgoing Expand
messages and packets. An Expand line-handler process handles direct links and also
binds to other processes via the network access method (NAM) interface to support
Expand-over-X.25, Expand-over-ServerNet, and Expand-over-SNA links. The Expand-
over-IP line-handler process communicates with a NonStop TCP/IP process through
the shared memory of the QIO subsystem. The Expand-over-ATM line-handler process
communicates with the Asynchronous Transfer Mode (ATM) subsystem through the