Time Division Multiplexing TDM Hierarchy

North America and Canada identify the digital time division multiplexing (TDM) hierarchy as "T," as in T1, T3, and so on. Japan identifies the digital TDM hierarchy as "J," as in J1, J3, and so on. International identification of the digital TDM hierarchy is "E," as in E1, E3, and so on.

Table 13-1 details the number of [DS0] channels and data rates for each TDM hierarchy level.

Table 13-1. North American, Canadian, Japanese, and International TDM Carrier Standardsm

North America (Canada, Japan)

International (ITU-T)

Designation

Number of Channels (DS0s)

Data Rate (Mbps)

Level

Number of Channels (DS0s)

Data Rate (Mbps)

DS-1

24

1.544

1

30

2.048

DS-1C

48

3.152

2

120

8.448

DS-2

96

6.312

3

480

34.368

DS-3

672

44.736

4

1920

139.264

DS-4111

4032

274.176

5

7680

565.148

[1] At the time AT&T BellLabs introduced the DS-4, the Optical Carrier (OC) was developed, which enabled the bundling of several DS-3s to be transmitted via fiber-optic cable.

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