Avaya Configuring WAN Line Services Bedienungsanleitung Seite 167

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Configuring FT1 Services
117345-B Rev. 00
8-7
SF/D4 -- Transmits superframes, each consisting of 12 individual frames
For more information on these frame formats, “Setting the T1 Frame Type” on
page 6-3
.
See the Line Type parameter on page A-44
for information.
Setting the FT1 Line Coding
T1 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). A long string of zeros 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 FT1 interface uses bipolar with 8 zero substitution (B8ZS) line
coding. You can select AMI line coding instead.
B8ZS line coding replaces a block of eight consecutive binary zeros with an 8-bit
B8ZS code. For more information on B8ZS line coding, see “Enabling or
Disabling Bipolar with 8 Zero Substitution (B8ZS)” on page 6-4
.
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 FT1 link module
remains synchronized upon receiving up to 45 consecutive zeros.)
Set the line coding for this FT1 interface. See the Line Coding parameter on
page A-45
for information.
Setting the Signal Level
The Signal Level parameter specifies the T1 transmit power level in decibels (dB).
Line buildout conditions the signals to mitigate attenuation. Line buildout also
depends on the physical length of the T1 line.
Note:
If the T1 receive path detects a B8ZS code word when the line is
configured for AMI coding, the router generates a log message and an SNMP
trap.
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