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Datex-M was Deutsche Telekom's SMDS product, Switched Multimegabit Data Service (SMDS). The "M" stood for multimegabit/s and multimedia capability of the MAN technology used for this purpose.

The Datex-M network can be characterized by the transmission properties connectionless, packet-oriented and broadcast- or multicast-capable. The Datex-M connection was assigned an individual, globally unique singlecast address and this was assigned a multicast address, based on ITU-T RecommendationE.164.

Datex-M was a broadband, multi-site public network ideally suited for LAN-to-LAN connections. It could be used both for point-to-point connections between singlecast addresses and for point-to-multipoint connections within a multicast group. Connections with transmission rates of 2 Mbit/s, 4 Mbit/s, 6 Mbit/s, 8 Mbit/s, 34 Mbit/s and 140 Mbit/s were provided for this purpose. Two network access points were available: The Customer Network Interface (CNIU) and the Digital Service Unit( DSU). The CNIU was provided by the network operator, it contained interfaces with speeds of 34 Mbit/s and 140 Mbit/s and could be connected directly to Ethernet and Token Ring via routing functions.

Datex-M was based on SMDS and had as its transport mechanism the international Distributed Queue Dual Bus( DQDB) standard according to IEEE 802.6. The network could also be used for voice and video communications. The service was offered on demand in economic centers at individual rates.

Englisch: Datex-M
Updated at: 10.04.2019
#Words: 213
Links: switched multimegabit data service (WAN) (SMDS), multimedia (MM), metropolitan area network (MAN), network, transmission
Translations: DE

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