Sdh Transmission Architecture; Figure 27. Sdh Payload Functional Architecture - Alcatel 1850 TSS-320 Technical Handbook

3.2.1 SDH transmission architecture

The overall functional architecture for SDH traffic is depicted in Figure 27. on page 60.
The description of SDH architecture is based on SDH terminologies, taking ITU-T standards (mainly
G.783) as a reference for the functional model description.
When dealing with SDH traffic, the functions of MSPC and HVC, foreseen by the standard functional
model, collapse in one single entity implemented in the central switching element.
SDH LO traffic switching is managed in a different separated device (not available in current release)
SDH functional architecture can be further divided into different subsystems dedicated respectively to the
management of:
– SDH HO traffic (i.e. VC-4 for SDH) (refer to paragraph 3.2.1.1 on page 61);
– SDH/Sonet LO traffic (i.e. VC-3, VC-12 for SDH) (refer to paragraph 3.2.1.2 on page 61);
– PDH access and mapping (refer to paragraph 3.2.1.3 on page 62);
STM - N - TTF
TTF
Sk
Sk
140Mb/s 140Mb/s
PDH
PDH
PDH PDH
PPI
PPI
proc
map
proc
map
E1, T1, E3, T3
Alcatel 1850 TSS-320 Rel. 1.1
60/270 8DG 07734 AAAA Edition 01
HVC
HVC
before
before
HPT
HVC
HPT
HVC
So
before
So
before
UNIVERSAL
HPT LVC
HVC
HPT LVC
HVC
Sk RX
after
Sk RX
after
LPT LVC
PDH
PDH LPT LVC
PDH PDH
PPI
PPI
proc So RX
proc map So RX
map

Figure 27. SDH payload functional architecture

HVC
HVC
after
after
HPT
HVC
HPT
HVC
Sk
after
Sk
after
MSPC MSPC
MSPC MSPC
HPC HPC
HPC HPC
MATRIX
LVC
HPT HVC
LVC
HPT HVC
TX
TX before before
before before
LVC LPT
PDH
LVC LPT PDH
PDH PDH
TX Sk proc
TX Sk demap proc
demap
LPC LPC
LPC LPC
TTF
TTF
So
So
PDH
PDH
PDH PDH
PPI
PPI
proc
demap
proc
demap
PPI
PPI
Technical Handbook Common
Functional Description