Encyclopedia > Intermediate system to intermediate system
Intermediate system to intermediate system (IS-IS), is an IGP routing protocol originally designed for CLNS as part of the OSIprotocol stack and described in ISO 10589 . It was extended to include support for routing IP. It is now used in large backbone carriers today for delivering IP routing information. It maintains a link state database similar to OSPF. It supports variable length subnet masks. As with all routing protocols it resides at the network layer of the OSI model. IS-IS uses multicast to discover neighbouring routers using hello packets. It supports authentication of routing updates.
The TCP/IP implementation was described in RFC 1195.
Thus, intermediate consumption is an accounting flow which consists of the total monetary value of goods and services consumed or used up as inputs in production by enterprises, including raw materials, services and various other operating expenses.
Intermediate consumption (unlike fixed assets) is not normally classified in national accounts by type of good or service, because the accounts will show net output by sector of activity.
Excluded from intermediate consumption in the UNSNA system are:
The intermediate film system was a television process used in 1932-1937 in which motion picture film was processed almost immediately after it was exposed in a camera, then scanned by a television scanner, and transmitted over the air.
This system was used principally in Britain and Germany where television cameras were not sensitive enough to use natural reflected light in outdoor scenes, but could transmit a suitable image when a bright light was shown through motion picture film or a still transparency directly into the camera lens.
The exposed film, either 35mm or 17.5mm (35mm split in half), travelled in a continuous band from the camera, usually atop a remote broadcast vehicle, into a machine that developed and fixed the image.
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