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PDH/SDH Channelization

 

PDH Channelization

 

Digital Hierarchy
Bit Rate
Typical Structure
Usual notation
Exact value
E0
64 Kbps
64 kbit/s
1 voice channel
E1
2 Mbps
2 048 kbit/s

30 channels

of 64 kbit/s
E2
8 Mbps
8 448 kbit/s
4 E1
E3
34 Mbps
34 368 kbit/s
16 E1
E4
140 Mbps
139 264 Kbit/s
64 E1 or 4 E3

 

Source: G.702 (UIT)

 

 

SDH Channelization

 

Digital
Hierarchy
Bit Rate
Typical tributary
structure
Usual notation
Exact
value
STM1
155 Mbps
155 520 kbit/s

63 E1 or 3 E3
STM4
622 Mbps
622 080 kbit/s
4 STM1
STM16
2.5 Gbps
2 488 320 kbit/s

16 STM1 or 4 STM4
STM64
10 Gbps
9 953 280 kbit/s

64 STM1, 16 STM4

or 4 STM16

 

Source: G.707 (UIT)

 

The channels of the PDH and SDH digital hierarchies might be used in a non-structured configuration, with the same bit rates of the full channels.

 

 

SONET x SDH Compatibility

 

Nomenclature
SONET
SDH
Tributary
VT: Virtual Tributary
VC: Virtual Container
Electric Signal
STS: Synchronous Transport Signal
STM: Synchronous Transport Module
Optic Signal
OC: Optical Carrier

 

 

 

SONET
Bit Rate
(Kbit/s)
SDH
VT1.5
1 544
VC-11
VT2.0
2 048
VC-12
VT3.0
3 152
-
VT6.0
6 312
VC-21
-
8 448
VC-22
-
34 368
VC-31
-
44 736
VC-32
-
139 264
VC-4
STS-1 (OC-1)
51 840
STM-0
STS-3 (OC-3)
155 520
STM-1
STS-6 (OC-6)
311 040
-
STS-9 (OC-9)
466 560
-
STS-12 (OC-12)
622 080
STM-4
STS-18 (OC-18)
933 120
-
STS-24 (OC-24)
1 244 160
-
STS-36 (OC-36)
1 866 240
-
STS-48 (OC-48)
2 488 320
STM-16
STS-96 (OC-96)
4 976 640
-
STS-192 (OC-192)
9 953 280
STM-64

 

 

 

 

 

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