Digital Ethernet Local Network Interconnect
Encyclopedia
The Digital Ethernet Local Network Interconnect (DELNI) was an Ethernet hub
with nine ports and AUI
connectors, made by Digital Equipment Corporation
(DEC). Ports one to eight had male connectors and are normally used to attach computer interfaces directly. Port number nine (marked by a square instead of a number) had a female connector and was used to attach a media access unit (MAU
), for example a DESTA with a thinwire connector or the H4000 for thickwire Ethernet.
The ninth port could also be used as an input from another DELNI. Cascading was allowed for a maximum of two steps. If the ninth port was used for that purpose, then the switch next to it was set to the upper position (marked by an empty square). This switch was in the lower position (crossed square) when port nine is attached to a computer system.
The DELNI had its own power supply switchable between 120VAC and 240VAC. It had a standard 19" wide rackmount housing and occupied 1.5 rack units. The DELNI was also available as a desktop (or better floor-stand) unit with cosmetic plastic covers.
The DELNI was produced from 1983 until it was replaced by the so-called "Replacement DELNI" in 1994. This replacement DELNI had exactly the same functions but was produced with more modern components and a more stylish cover.
PAIX
, one of the earliest Internet exchange point
s, used a DELNI as its interconnection infrastructure.
Ethernet hub
An Ethernet hub, active hub, network hub, repeater hub or hub is a device for connecting multiple Ethernet devices together and making them act as a single network segment. A hub works at the physical layer of the OSI model. The device is a form of multiport repeater...
with nine ports and AUI
Attachment Unit Interface
An Attachment Unit Interface is a 15 pin connection that provides a path between a node's Ethernet interface and the Medium Attachment Unit , sometimes known as a transceiver. It is the part of the IEEE Ethernet standard located between the Media Access Control , and the MAU...
connectors, made by Digital Equipment Corporation
Digital Equipment Corporation
Digital Equipment Corporation was a major American company in the computer industry and a leading vendor of computer systems, software and peripherals from the 1960s to the 1990s...
(DEC). Ports one to eight had male connectors and are normally used to attach computer interfaces directly. Port number nine (marked by a square instead of a number) had a female connector and was used to attach a media access unit (MAU
Media Access Unit
A Media Access Unit is a device to attach multiple network stations in a star topology in a token ring network, internally wired to connect the stations into a logical ring. The MAU contains relays to short out nonoperating stations...
), for example a DESTA with a thinwire connector or the H4000 for thickwire Ethernet.
The ninth port could also be used as an input from another DELNI. Cascading was allowed for a maximum of two steps. If the ninth port was used for that purpose, then the switch next to it was set to the upper position (marked by an empty square). This switch was in the lower position (crossed square) when port nine is attached to a computer system.
The DELNI had its own power supply switchable between 120VAC and 240VAC. It had a standard 19" wide rackmount housing and occupied 1.5 rack units. The DELNI was also available as a desktop (or better floor-stand) unit with cosmetic plastic covers.
The DELNI was produced from 1983 until it was replaced by the so-called "Replacement DELNI" in 1994. This replacement DELNI had exactly the same functions but was produced with more modern components and a more stylish cover.
PAIX
PAIX
PAIX, the Peering And Internet eXchange, is a neutral Internet exchange point operated by Switch and Data.PAIX began operations in 1996 as Palo Alto Internet Exchange in Palo Alto, California, and was owned and operated by Digital Equipment Corporation, or DEC...
, one of the earliest Internet exchange point
Internet Exchange Point
An Internet exchange point is a physical infrastructure through which Internet service providers exchange Internet traffic between their networks . IXPs reduce the portion of an ISP's traffic which must be delivered via their upstream transit providers, thereby reducing the average per-bit...
s, used a DELNI as its interconnection infrastructure.