SDH Insights | Sumble

What is SDH?

Synchronous Digital Hierarchy (SDH) is a standardized digital communication protocol that transmits data over fiber optic cable. It's used primarily to transport large quantities of data, voice, and video traffic in telecommunications networks. SDH defines a hierarchical set of transmission rates, enabling efficient multiplexing and demultiplexing of lower-rate signals. It is the international equivalent of SONET.

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What other technologies are related to SDH?

SDH Competitor Technologies

PDH

PDH is a lower-speed, older technology for digital transmission that SDH replaced.

mentioned alongside SDH in 69% (822) of relevant job posts

OTN

OTN is a more modern technology that can perform similar functions to SDH, and provides improvements in terms of framing, multiplexing, and management capabilities.

mentioned alongside SDH in 22% (622) of relevant job posts

MPLS-TP

MPLS-TP provides connection-oriented transport and can be used as an alternative to SDH in some scenarios.

mentioned alongside SDH in 32% (195) of relevant job posts

PTN

Packet Transport Network. Can be an alternative transport technology to SDH

mentioned alongside SDH in 35% (168) of relevant job posts

SONET

SONET is the North American equivalent of SDH. Both are closely related and provide similar functionality, which means they are competitors in different regions.

mentioned alongside SDH in 9% (525) of relevant job posts

IP/MPLS

IP/MPLS is a packet-based technology that can be used as an alternative to SDH for data transport.

mentioned alongside SDH in 13% (298) of relevant job posts

eLAN-eLine

These are Ethernet services that compete with SDH for data transport.

mentioned alongside SDH in 62% (53) of relevant job posts

IP

IP is a packet-based technology that can be used as an alternative to SDH for data transport.

mentioned alongside SDH in 2% (797) of relevant job posts

SDH Complementary Technologies

DWDM

DWDM increases the capacity of optical fiber, and SDH signals can be transported over DWDM systems. It's complementary because DWDM provides the physical layer transport, and SDH provides the framing and management.

mentioned alongside SDH in 16% (1.9k) of relevant job posts

EoSDH

Ethernet over SDH encapsulates Ethernet frames within SDH for transport, therefore they are complementary.

mentioned alongside SDH in 69% (90) of relevant job posts

SNCP

SNCP (Subnetwork Connection Protection) is a protection mechanism used within SDH networks.

mentioned alongside SDH in 85% (71) of relevant job posts