TTSA S.A.’s SDH Services provide secure and seamless dedicated leased circuits for carriers and service providers over TTSA S.A.’s world-class network, making it the ideal solution for mission-critical voice or data transmission. TTSA S.A. SDH solution utilizes our high resilient global network to provide connectivity across the world.


We offer total end-to-end solutions in terms of IMBS or IEPL as described below, including network design, provisioning management and local tail arrangement, eliminating the burden of having to deal with many different carriers.


International Managed Bandwidth Service (IMBS)

IMBS is an end-to-end managed bandwidth service that provides customers with dedicated pure Layer-1 International data bandwidth for various types of real-time and mission-critical applications including data, voice and video.


International Ethernet Private Line (IEPL)

IEPL provides customers with dedicated International data connectivity and bandwidth with the same reliability, minimal transmission delay and network security as universally-trusted International Private Leased Circuits (IPLCs).


Synchronous Digital Hierarchy – SDH

SDH originates from Synchronous Optical Network (SONET). SDH circuits provide enterprises with reliable and secure transmissions over their own dedicated connection that is always on.


SDH offer predicted availability targets up to 99.99 percent error-free seconds per year, to ensure that critical data, voice and multimedia transmissions are always delivered, round the clock. SDH ability to carry multiple applications makes SDH suitable for:


  • Constructing voice and data backbone networks
  • Reservation systems
  • Telephone banking and financial transactions
  • Stock control, inventory and order information
  • Linking mainframes for bulk data transfer
  • Inherently flexible


SDH is a self-healing fiber optic technology that can re-route information in milliseconds if a transmission is interrupted. It also enables network configuration and capacity to be controlled by software, so that the customer can ensure service continuity even if they need to increase allocated bandwidth:


  • In response to business developments
  • To prepare for anticipated surges in network traffic


By aggregating circuits, a number of lower bandwidth circuits can be provided on a single aggregated interface. In addition to this multiplexing makes it possible to derive many channels depending on the application from the SDH service, enabling the customer to carry data, voice and multimedia communications securely and reliably.


ITU StandardFramingStructureLine RateTerminationImpedance
G.703 unstructuredE1VC122,048 MbpsElectrical 75/120 Ohm
G.704 structuredE1VC122,048 MbpsElectrical 75 Ohm
G.703E3VC-334 MbpsElectrical 75 Ohm
G.703DS3VC-345 MbpsElectrical 75 Ohm
G.703STM-1VC-4155,52 MbpsElectrical 75 Ohm
G.957STM-1VC-4155,52 MbpsOptical
G.957STM-4VC-4-4c622,02 MbpsOptical
G.957STM-16VC-4-16c2,488 MbpsOptical
G.691STM-64VC-4-64c9,953 MbpsOptical
G.693STM-256VC-4-256c39,813 MbpsOptical

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