ETSI - PRETS 300 300
Broadband Integrated Services Digital Network (B-ISDN); Synchronous Digital Hierarchy (SDH) Based User Network Access Physical Layer Interfaces for B-ISDN Applications
| Organization: | ETSI |
| Publication Date: | 1 January 1994 |
| Status: | inactive |
| Page Count: | 46 |
scope:
This European Telecommunication Standard (ETS) defines the physical layer interface to be applied to the SB and TB reference points of the reference configurations of the Broadband Integrated Services Digital Network (B-ISDN) Synchronous Digital Hierarchy (SDH) based User Network Interface (UNI) at 155 520 kbit/s and 622 080 kbit/s. It addresses separately the physical media and the transmission system used at these interfaces and addresses also the implementation of UNI related Operation And Maintenance (OAM) functions.
The selection of the physical medium for the interfaces at the SB and TB reference points should take into account that optical fibre is agreed as the preferred medium to be used to cable customer equipment. However, in order to accommodate existing cabling of customer equipment, other transmission media (e.g. coaxial cables) should not be precluded. Also, implementations should allow terminal interchangeability.
This ETS reflects in its structure and content the desire to take care of such early configurations and introduces a degree of freedom when choosing a physical medium at the physical layer.
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