
Configuring Dial Services
4-28
Parameter: Line Coding
Default: HDB3
Options: AMI | HDB3
Function: Selects a line coding method.
AMI line coding is bipolar: the router transmits a binary 0 as zero volts
and a binary 1 as either a positive or negative pulse, opposite in polarity to
the previous pulse. (When configured for AMI line coding, the MCE1
Link Module remains synchronized when it receives up to 45 consecutive
zeros.)
HDB3 (High-Density Bipolar Coding) line coding maintains sufficient
ones density within the E1 data stream. It replaces a block of 8
consecutive binary zeros with an 8-bit HDB3 code containing bipolar
violations in the 4th and 7th bit positions of the substituted code. In the
receive direction, the router detects and replaces the HDB3 code with 8
consecutive binary zeros.
Instructions: Specify the line coding method.
MIB Object ID: 1.3.6.1.4.1.18.3.4.9.4.1.7
Parameter: Setup Alarm Threshold
Default: 2 seconds
Range: 2 to 10 seconds
Function: Specifies the time interval (in seconds) during which the router tolerates a
performance defect or anomaly. If the performance defect or anomaly is
still present when the time interval specified by this parameter expires,
MCE1 records a performance failure and logs an event message.
Instructions: Set the timer value.
MIB Object ID: 1.3.6.1.4.1.18.3.4.9.3.1.7
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