October 2018
Intermediate to advanced
555 pages
17h 33m
English
Content preview from Principles of Synchronous Digital Hierarchy
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332 Principles of Synchronous Digital Hierarchy
information to the transmitter about the number of block errors received
through the M1 byte (called MS-REI). Now what the transmitter does out of
this information?
The purpose of monitoring the number of errors is twofold:
(i) To check the system for possible faults and initiate corrective action
before the complaint is received from the customer.
(ii) To take the circuit out of service if the quality is very poor and pro-
vide an alternative link to the customer.
Decision (ii) is taken if the number of errors crosses a preset threshold level.
The threshold can be set during or after the installation through themanage-
ment tools. A threshold of 10
−3
, 10
−4
, or 10
−5
is generally set for ...
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