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OPERATION
3-33
DTE Code
This sets the Line Code option for the equipment side to A M I (Alternate
Mark Inversion, with no bipolar violations) or B8ZS (Bipolar with 8 Zero
Substitution, with bipolar violations). Which one you choose depends pri-
marily on the design of the T1 link: all equipment must be compatible
with the AMI line code, and some equipment may not be compatible with
the B8ZS line code. The default setting is A M I . When the CSU is config-
ured as a slave CSU, this option cannot be changed via the Supervisory
terminal. (This option, and the NET Code option, are also set via option
switch S5-5. When PMC-100 Operation is disabled, option switch S4-8 is
used to set the Transcoding option, which sets DTE Code to AMI and
NET Code to B8ZS.)
Do not select B8ZS for DTE Code and AMI for NET
Code. This combination causes data errors when the
customer equipment transmits more than 15 consecutive
zeros.
NET Code
This sets the Line Code option for the network side to A M I (Alternate
Mark Inversion, with no bipolar violations) or B8ZS (Bipolar with 8 Zero
Substitution, with bipolar violations). Which one you choose depends pri-
marily on the design of the T1 link: all equipment must be compatible
with the AMI line code, and some equipment may not be compatible with
the B8ZS line code. To implement 64 kbps Clear Channel Capability, you
must choose the B8ZS line code (the CSU automatically sets the Ones Den-
sity option to INHIBIT). The default setting is A M I . When the CSU is
configured as a slave CSU, this option cannot be changed via the Supervi-
sory terminal. (This option, and the DTE Code option, are also set via op-
tion switch S5-5. When PMC-100 Operation is disabled, option switch S4-8
is used to set the Transcoding option, which sets DTE Code to AMI and
NET Code to B8ZS.)
DTE Frame
This sets the Equipment Frame Format option for the equipment side to
AUTO (Auto Framing), M A N (manually-set framing) or NONE (no
framing), and one of the following framing types: D4 (D4 Superframe
Format) or ESF (Extended Superframe Format). With Auto Framing, the
CSU adapts to the received framing: the network side transmitter uses the
framing received from the network, and the equipment side transmitter
uses the framing received from the equipment. When AUTO is selected,
NET Frame is also set to AUTO. Similarly, when M A N is selected, NET
Frame is also set to M A N . When NONE is selected, enabling Unframed
Mode, DTE Frame is also set to NONE. (In Unframed Mode, some
Supervisory terminal screens and front panel LEDs are affected. The dif-
ferences are discussed with the affected items.) The default setting is
AUTO. When the CSU is configured as a slave CSU, this option cannot be
changed via the Supervisory terminal. (This option is also set via option
switches S5-2 and S5-3, and S4-7 when PMC-100 Operation is disabled.)
CAUTION
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