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Port 1 Configuration Switch 3 controls the frame type of both T1 links (Port 1 and Port 2);
frame type for the two links cannot be configured independently.
Table 4. Frame Type Settings
Switch 3
down
up
Line Code – Port 1 Only, Switch 4
Line code is the T1 mode of transmission. The two line code options outlined below fall
within the International Telecommunication Union - Telecommunication Standardization
Sector (ITU-T) G.703 Standards for Transmission Facilities.
Bipolar with 8 Zero Substitution – Bipolar with 8 Zero Substitution (B8ZS) is used to
accommodate the minimum ones density requirement in the North American public
network. B8ZS line encoding helps prevent loss of synchronization between the
TNE1520 and remote T1 equipment by using bipolar violations to guarantee the
presence of pulses in the T1 line.
Alternate Mark Inversion – Alternate Mark Inversion (AMI) alternates positive and
negative pulses.
Port 1 Configuration Switch 4 on the TNE1520-P and the TNE1520-S controls the line
code of both T1 links (Port 1 and Port 2); line code for the two links cannot be configured
independently.
Table 5. Line Code Settings
Switch 4
down
up
Frame Type
Extended Super Frame
Super Frame
Line Code
Bipolar with 8 Zero Substitution
Alternate Mark Inversion
7
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