Synchronous Transport Module. STM-1 is the basic building block in European synchronous networks. It corresponds to a data rate of 155.52Mbit or STS-3
synchronous transfer module. an element of the SDH transmission hierarchy; STM–1 is SDH's base-level transmission rate equal to 155 Mbps; higher rates of STM–4, STM–16, and STM–48 are also defined
A basic building block used for a synchronous multiplexing hierarchy defined by the CCITT/ITU-T. STM-1 operates at a rate of 155.52 Mbps (the same as STS-3).
Somm htm Societe de Transport de Montreal
synchronous transport mode
Synchronous Transfer Mode. B-ISDN communications method that transmits a group of several traffic streams synchronized to a single reference clock. This is the standard method carriers currently utilize to assign channels within a T1/E1 line.
Synchronous Transfer Mode. Clocked data transmission, where the receiving device knows when to expect the next unit of data. Synchronous Transport Module. A definition of the electrical level signal rate and frame structure for SDH networks. STM-1 is equivalent to STS-3 for SONET. See also SDH.
Synchronous Transfer Mode STN
In ATM, a method of communications that transmits data streams synchronized to a common clock signal (reference clock).
synchronous transport module; the basic unit of transmission in SDH
Synchronous Transport Module level 1. One of a number of SDH formats that specifies the frame structure for the 155.52-Mbps lines used to carry ATM cells. See also SDH. Stream Jitter Measures the inter-packet gaps for all packets of the data stream for a given transfer direction. See also jitter.
Synchronous Transfer Mode. Aka Broadband Integrated Services Digital Network, enabling the user to have a DS3, POTS line, or ISDN-BRI automatically, depending on the device accessing the line.
Synchronous Transfer Mode. Where the time is assigned to each channel for periodic transmissions.
Synchronous Transport Module, STM-1 is the basic building block in European synchronous networks, corresponding to a data rate of 155.52 Mbps.
Synchronous Transport Module. 155.52 Mbps bandwidth for electrical or optical signals in a SDH.
Synchronous Transfer Mode. New term for traditional TDM switching to distinguish it from ATM.
Synchronous transport module. CCITT specification for SONET at 155.52 Mbps.
The basic building block of SDH. STM-1 consists of 9 rows of 270 bytes each. The first 9 columns contain the section and line overhead for all STS-3s. The remaining 261 columns contain the combined envelope capacity of the component STS-1s. STM levels include STM-0, STM-1, STM-4, STM-16, STM-64, and STM-256.