Alcatel-Lucent 1643 AMS User's Operation Manual page 593

Performance monitoring
Example of near end/far end forward/backward monitoring
The graphic below describes Near End/Far end Forward/Backward monitoring. The
termination point (TP) at network element-A is monitored on the receiving end, or
Near End where the B-bytes are verified for parity. If there is an error, an REI is sent
upstream. The TP at network element-B is monitored on its receiving end, and since it
is distal from NE-A, it is referred to Far end.
Because the path is terminated in NE-A and NE-B these monitoring points are
termination points (TPs). In a TP the BIP value is recalculated and compared to the
value stored in the received B byte. If an error is detected an REI will be sent to its
originating source and the error will be declared as Near End PM data. The REI
received will be declared as Far End PM data.
In network element-I the REI value is read and is declared as Backward or Forward
PM data of the Connection Termination Points. For example in CTP#1 the Forward
PM data consists of the REI transmitted from A to B (and so indicating the quality of
the path in the direction from B to A). The Backward PM data in CTP#1 consists of
REI transmitted from B to A (and so indicating the quality of the path in the direction
from A to B).
LAN/WAN port monitoring
Using the TransLAN
Ethernet LAN ports, or 4 WAN ports per card.
The LAN port maps directly from the Ethernet to SDH, to either:
• 1 or 2 concatenated VC3
• 1 to 63 concatenated VC12
When a LAN connection is set up using the TransLAN
this LAN will be available as long as the counter for an active VC-12 is enabled.
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365-312-807R7.2
Issue 4, May 2007
®
option card, it is possible to monitor up to 4 X 10/100BaseT
Alcatel-Lucent - Proprietary
See notice on first page
Performance measurements
®
option card, PM data about
10-11