
Testing MCE1 and MCT1 Interfaces
114078 Rev. A C-5
MCE1 Lines
By default, the MCE1 interface uses high-density bipolar coding (HDB3) line
coding testing. You can select T34AMI line coding method instead.
AMI line coding is bipolar: a binary 0 is transmitted as zero volts and a binary 1 is
transmitted 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 upon receiving up to 45 consecutive 0s.)
MCT1 Lines
By default, the MCT1 interfaces uses B8ZS (Bipolar with 8-Zero substitution)
line coding. You can select AMI line coding instead.
B8ZS line coding replaces a block of eight consecutive binary 0s with an 8-bit
B8ZS code containing bipolar violations in the fourth and seventh bit positions of
the substituted code. In the receive direction, the B8ZS code is detected and
replaced with eight consecutive binary 0s.
AMI line coding is bipolar: a binary 0 is transmitted as zero volts and a binary 1 is
transmitted as either a positive or negative pulse, opposite in polarity to the
previous pulse. (When configured for AMI line coding, the MCT1 link module
remains synchronized upon receiving up to 45 consecutive 0s.)
Setting the Line Type
How you set line type depends on whether you are testing an MCE1 or MCT1
line.
MCE1 Lines
Select the appropriate frame format for the associated E1 equipment.
•E1
• E1 CRC
• E1 MF
• E1 CRC MF
Note that the router does not support MF framing when you enable BERT mode.
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