SONET/SDH 傳輸架構 : ADM(Add Drop Mux), TM(Terminal Mux)的觀念

N x 155.52 Mbps

(STM-N)

• Point-to-Point

High speed

N x 155.52 Mbps

(STM-N)

TM,

ADM

TM,

ADM

• Linear Structure

Low speed

Low speed

High speed

ADM

ADM

Low speed

N x 155.52 Mbps

(STM-N)

N x 155.52 Mbps

(STM-N)

• Tree Structure

ADM

N x 155.52 Mbps

(STM-N)

M x 155.52 Mbps

(STM-M)

M x 155.52 Mbps

(STM-M)

K x 155.52 Mbps

(STM-K)

1+1 or 1:1 APS

1+1 or

1:1 APS

1+1 or

1:1 APS

Low speed

TM,

ADM

Low speed

TM,

ADM

Low speed

TM,

ADM

Low speed

TM,

ADM

Low speed

TM,

ADM

Low speed

ADM

Low speed

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