Specifications

Wide Area Time Slot Configuration Windows
QuickSET Configuration Guide 101
Line Coding
Clicking the Line Coding button on any wide area time slot configuration window displays the
Line Coding window shown in Figure 109 below. Clicking the Automatically Match Line
Coding for each Interface check box sets all time slots assigned to a specific interface number to
the selected coding simultaneously.
Note that the Line Coding window for E1 contains 32 interfaces vs. 24 for T1, and DI.
The Line Coding window lets you select one of three coding setups:
None — No Line Coding is applied to the selected interface the (the interface’s time slots are
displayed in this window), and the full 64Kbps channel bandwidth is available.
JBZS — Jam Bit - Zero Suppression, a form of zero suppression that places a one in the seventh
bit of a timeslot. This coding reduces the effective throughput to 56K bps.
IHDLC — Inverse High-Level Data Link Control - a form of zero suppression in which all zeros
in the HDLC packet are changed to ones, and all ones are changed to zeros.
Figure 109 Line Coding Window