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•
LPA (S12/P12x_A_Sk): It extracts the VC12–POH and processes the TU12 pointer.
•
V5[5–7]: Signal label detection in the byte V5[5–7] ––> Signal label Mismatch
detection
•
AIS or SSF is applied if Signal label Mismatch is detected
If the signal is unstructured the incoming signal (L Link) is sent through the SWITCH to the HPT block.
HPT (Sn_TT_Sk) : path trace information is recovered, REI information is recovered, HP–RDI
and UNEQ are detected, VC4 BIP–8 errored count block. TSF is applied if SSF or UNEQ or TIM
or AIS is detected.
TSD is applied if a condition of signal degrade is detected.
N1 byte extraction (Rx side): for the network Tandem Connection Termination & Monitoring
function (TCT/TCM).
Tx side: from LPA or HPT to matrix on MATRIXE
The task of the SWITCH block is to sent the signal coming from HPT or LPT block towards the matrices
on the MATRIXE. The selection is made according to the type of signal to be connected ( L if is structured
or X if unstructured).
If the signal is structured the datas coming from ATM MAPPING block are sent through the LPT and LPA
blocks towards the SWITCH block.
•
LPA (S12/P12x_A_So) :
domain. For asynchronous user data, lower order path adaptation involves bit justification. The
2.048 Mbit/s is inserted into a C–12 container (by means of asynchronous mapping), which is
synchronized (stuffing) with the correspondent TU–12.
•
V5[5–7]: Signal label insertion in the byte V5[5–7].
•
LPT (S12_TT_So) : The LPT function creates a VC–12 by generating and adding POH to a
C–12. The POH formats are defined in Recommendations G.708 and G.709.
•
J2:
•
V5[1,2]: BIP–2 is calculated and transmitted.
•
V5[3]:
•
V5[8]:
If the signal is unstructured the datas coming from ATM MAPPING block are sent through the HPT block
to the SWITCH block.
HPT (Sn_TT_So) : path trace identification insertion, RDI and REI indications insertion, VC–4
BIP–8 calculation and insertion, signal label insertion.
N1 byte insertion (Tx side): for the network Tandem Connection Termination & Monitoring
function (TCT/TCM).
HPOM, HSUT BLOCK (HSUT is not operative in this release)
HPOM performs the monitoring of an equipped path while HSUT performs the termination of an
unequipped path.
From HPOM and HSUT are recovered :
•
the primitives used for Performance Monitoring (Errored block count, Defect seconds)
•
switching criteria for SNCP/N protection
The two functions are alternative.
ED
02
This block adapts user data for transport in the synchronous
trail trace identifier is generated.
the number of errors is encoded in REI.
RDI indication is inserted.
3AL 91669 AA AA
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