Abstract: A system for providing access to subscriber lines includes a plurality of blade test access modules, including: a first blade test access module configured to engage with a first portion of a distribution frame. The first blade test access module includes first substrate, a plurality of first conductors positioned to engage with first terminals of the distribution frame, and one or more switches to control access to a first plurality of subscriber lines connected to the first terminals. The plurality of blade text access modules also includes a second blade test access module configured to engage with a second portion of the distribution frame. The second blade test access module includes a second substrate, a plurality of second conductors positioned to engage with second terminals of the distribution frame, and one or more switches to control access to a second plurality of subscriber lines connected to the second terminals.

Abstract: The apparatus may be implemented in software which performs the following steps: calculating a desired air velocity in the exhaust duct from a first input signal representative of the size of a variable sash opening and a first user defined setpoint representative of a desired face velocity; comparing successive values of the desired air velocity to determine any absolute and percent change therebetween; comparing the absolute change to a user defined reset deadband value; producing output signals, responsive to a second input signal representative of the measured air velocity in the exhaust duct and the second comparing step, for input to the fan so as to force the measured air velocity toward the desired air velocity. The production of the output signal is accomplished by adaptive, feedforward techniques when the absolute change is greater than the reset deadband and is accomplished by proportional/integral techniques when the absolute change is less than the reset deadband.