Specifications

Glossary–4
concentrator
The FDDI concentrator is a physical layer repeating device that allows the attach-
ment of multiple single attachment stations, dual attachment stations, or other con-
centrators to the FDDI network.
DECnet
Digital networking software that runs on nodes in both local-area and wide-area net-
works.
Data-Set-Ready (DSR)
When set, a control signal that indicates to the data terminal equipment that the local
modem is connected to the channel and is ready to receive data or to accept a request
to transmit.
Data-Terminal-Ready (DTR)
A control signal that enters a modem from the data terminal or communications
device that is using the modem. When the signal is set, it informs the modem that the
data terminal equipment is ready to receive and transmit data.
DECnet address
A series of numbers that identifies a device’s location in the DECnet network.
DECnet name
A unique alphanumeric string that identifies a device on the DECnet network.
device
A network element that is external to the hub or computer equipment (such as a
printer, terminal, or personal computer (PC)) that is attached to an access server port.
double hub
Two DEChub 90 hubs daisy-chained together. A double hub is treated as a single
hardware device and is represented by a single community.
downline load
The process of sending a software image from a load host to the bridge.
dual attachment station (DAS)
An FDDI station that offers two connections to the FDDI dual counter-rotating ring.