If a one BPV has been created, we would see two consecutive pulses of the same polarity. B8ZS is a different line code that intentionally sends and receives BPVs in a specific pattern to carry a special meaning related to 64 kbps Clear Channel unrestricted data. In contrast, most pieces of DS-1 terminal equipment, such as channel banks, are very sensitive to proper framing format. Between these two types of elements, there might be intermediate elements, such as higher order multiplexers and automatic protection switches. These elements may or may not be sensitive to framing format.
Some elements even convert from one framing format to another.
A few also have the ability to auto-configure depending on the signal format that is first received. Voltage and Temperature Factors Normal simplex loop current is 60 mA for modern line repeaters. Occasionally, problems with AC power induction can be overcome by increasing the loop current within the tolerance of the repeaters. Aerial cable is exposed to much hotter temperatures than buried cable, and this must be calculated into the design.