Figure 46. Pdh Mapping Into Lo Sdh (Loi) Card Implementation And Itu-T Functional Model - Alcatel 1850 TSS-320 Technical Handbook

3.4.4.2 LOI card
The Lower Order Interface card manage the mapping of PDH clients into Lower Order SDH tributaries
(e.g. E2 over VC-12).
The card is interfaced with the payload UNIVERSAL MATRIX device, but, differently from HOI, the matrix
is only used for HO tributaries aggregation, in order to present traffic to the LOA boards, as above
described.
The generic card block diagram, with its atomic functions representation is depicted in Figure 46. on page
87
In LOI card representation, the LPT and LVC functional blocks are depicted with a dotted box, due to the
fact that the physical implementation is not in the LOI card, but in the LOA cards managing the LPC
interfacing (the diagrams shows the logical implementation of the LOI card): LOI cards should generate
a LO VC with a meaningless path OH, mapped into an HO VC needed for intrashelf interconnection.
The LO tributaries are then processed as described in section 3.4.2.1 on page 79.
Non intrusive monitoring of the PDH signals is performed before their mapping into SDH payload in one
direction, after the demapping in the other one.
For E2 client signals is also possible to terminate the PDH frames, managing PRA functionalities

Figure 46. PDH mapping into LO SDH (LOI) card implementation and ITU-T functional model

Technical Handbook Common
Functional Description
LVC
RX
LPT
So
LPAm
So
PDH
proc
PPI
Sk
LOI card
Pqe
Eq/Pqe Eq/Pqx Sm/Pqx
Eq Sm
Sm/SmD
SmD
LVC
TX
LPT
Sk
LPAm
Sk
PDH
proc
PPI
So
Sm/Pqx Eq/Pqx
Sm Eq
Sm/SmD
SmD
LOI card
8DG 07734 AAAA Edition 01
Pqe
Eq/Pqe
Alcatel 1850 TSS-320 Rel. 1.1
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