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Plesiochronous Digital Hierarchy.
プレシオクロナス・デジタル・ハイアラーキ（英語：plesiochronous digital hierarchy、略称：PDH）は、同期デジタル・ハイアラーキ（synchronous digital hierarchy、SDH）によって統一される前の、地域によって異なっていた同期網の構成である。チャネルを段階を踏んで多重化するためハイアラーキと呼ばれる。
| 名称 |
速度Mbps |
Bチャネル数 |
下位群束数
|
| 1次群 |
1.544 |
24 |
-
|
| 2次群 |
6.312 |
96 |
4
|
| 3次群 |
32.067 |
480 |
5
|
| 4次群 |
97.728 |
1440 |
3
|
| 5次群 |
397.200 |
5760 |
4
|
| 名称 |
速度Mbps |
Bチャネル数 |
下位群束数
|
| T1 |
1.544 |
24 |
-
|
| T2 |
6.312 |
96 |
4
|
| T3 |
45 |
672 |
7
|
| T4 |
274.176 |
4032 |
6
|
| 名称 |
速度Mbps |
Bチャネル数 |
下位群束数
|
| E1 |
2 |
30 |
-
|
| E2 |
8 |
120 |
4
|
| E3 |
34 |
480 |
4
|
| E4 |
139 |
1920 |
4
|
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Plesiochronous Digital Hierarchy
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