bridge tap
A bridge tap is an extraneous length of dangling, unterminated cable on a communications line, usually left over from an earlier configuration, that can cause impedance mismatches and other undesired effects in transmissions. In a given cabling arrangement, allowance is usually made for a certain length of bridge taps.
ISDN uses the standard line code, 2B1Q, because it has the ability to handle the incidence of bridge taps well.
This was last updated in April 2007