STM-1
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The STM-1 (Synchronous Transport Module level-1) is the SDH ITU-T fiber optic network transmission standard. It has a bit rate of 155.52 Mbit/s. Higher levels go up by a factor of 4 at a time: the other currently supported levels are STM-4, STM-16, STM-64 and STM-256. Above STM-256 wavelength-division multiplexing (WDM) is commonly used in submarine cabling.
In the Vinony graph
Within Vinony's link graph, STM-1 is referenced by 20 other articles, and connects out to synchronous optical networking, optical fiber and data transmission.
It is catalogued under the topic Synchronous optical networking.
Its subject is documented across 10 Wikipedia language editions.
~4 min read
Encyclopedic overview
5 sectionsContents
- Frame structure
- Frame characteristic
- RSOH (regenerator section overhead)
- MSOH (multiplex section overhead)
- References
The STM-1 (Synchronous Transport Module level-1) is the SDH ITU-T fiber optic network transmission standard. It has a bit rate of 155.52 Mbit/s. Higher levels go up by a factor of 4 at a time: the other currently supported levels are STM-4, STM-16, STM-64 and STM-256. Above STM-256 wavelength-division multiplexing (WDM) is commonly used in submarine cabling.
==Frame structure== The STM-1 frame is on the basic transmission format for SDH (Synchronous Digital Hierarchy). An STM-1 frame has a byte-oriented structure with 9 rows and 270 columns of bytes, for a total of 2,430 bytes (9 rows * 270 columns = 2430 bytes). Each byte corresponds to a 64 kbit/s channel.
Excerpted from Wikipedia’s “STM-1” article, available under the CC BY-SA 4.0 licence.