
Configuring MCE1 and MCT1 Services
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7-9
Setting the MCE1 Line Type
Select one of the following line types (frame formats) to match your E1
equipment:
Using the BCC
To change the line type, navigate to the mce1 prompt (for example,
stack
;
mce1/1/2/1
) and type:
port-line-framing
variable
For example:
mce1/1/2/1#
port-line-framing e1-crc
Using Site Manager
See the Line Type parameter on page A-25 for information.
Setting the MCE1 Line Coding
E1 uses bipolar format for signals. In bipolar format, alternating positive and
negative pulses on the digital line signify the number 1, and the absence of a pulse
signifies 0 (see Figure 6-2 in Chapter 6). A long string of zeros on an E1 line
would cause the line to lose synchronization due to lack of pulses. Nortel
Networks provides a line-coding mechanism to maintain synchronization.
By default, the MCE1 interface uses high-density bipolar (HDB3) line coding.
You can select alternate mark inversion (AMI) line coding instead.
Table 7-3. MCE1 Line Type Options
BCC Option Site Manager Option
e1 E1 (the default)
e1-crc E1 CRC
e1-mf E1 MF1
e1-crmf E1 CRC MF
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