Avaya Configuring WAN Line Services Bedienungsanleitung PDF herunterladen (Seite 120)

Configuring WAN Line Services

7-8

117345-B Rev. 00

Enabling or Disabling the MCE1 Port

An MCE1 port is enabled by default when you add the circuit. You can disable or

reenable this MCE1 port without moving any cables.

See the Enable/Disable parameter on page A-25

for information.

Setting the MCE1 Line Type

Select one of the following line types to match your E1 equipment:

• E1 (the default)

• E1 CRC

• E1 MF

• E1 CRC MF

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. Bay 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.

HDB3 line coding replaces a block of eight consecutive binary zeros with an 8-bit

HDB3 code containing bipolar violations in the fourth and seventh bit positions of

the substituted code. In the receive direction, the HDB3 code is detected and

replaced with eight consecutive binary zeros.

AMI line coding is also 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 port remains

synchronized upon receiving up to 45 consecutive zeros.

Set the line coding for this MCE1 interface.

See the Line Coding parameter on page A-26

for information.

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Avaya Configuring WAN Line Services Bedienungsanleitung Seite 120