Abstract: The invention refers to a telecommunications system comprising a module rack that defines a core bay, a service plane and a rack interface plane where the service plane is transverse to the rack interface plane. The core bay is in part bounded by the service plane and the rack interface plane. The telecommunications system also comprises a series of electronics modules each defining an electronics orientation plane where each of the modules includes two opposed cooling surfaces oriented substantially parallel to the electronics orientation plane. Each of the electronics modules is removably secured within the core bay. The series of the electronics modules forms an array such that their electronics orientation planes are substantially perpendicular to both the rack interface plane and the service plane. The array also defines at least one coolant stream passage across each cooling surface.

Abstract: A backplane power landing system having a backplane to which is attached extruded metal mounts on which are mounted compact power filter modules. The mounts are adapted to be conductively sealed, for the purpose of electromagnetic compatibility, to the backplane and have guidance slots to facilitate aligning the power filter modules which extend through openings in the central beam of the mount, to make contact with the backplane. The power filter modules are fastened to the mounts in a manner which maintains a conductive seal so as to deliver inputted power to the backplane filtered of radiated and conducted emission noise.

Abstract: Printed circuit boards with relatively high line speeds (for example, about one giga bit per second and above) are increasingly being developed. However, at these high line speeds problems arise with via-induced spurious modes being generated and propagating and reflecting along power or ground planes within the printed circuit board. This is problematic because any active devices which reference power or ground during the presence of such a spurious mode experience a change in the reference potential. This can lead to incorrect data reception or transmission. A resistive coating is applied to the edge of a printed circuit board, directly connected to the ground planes and capacitively connected to the power planes. This resistive coating acts to absorb spurious modes and prevent these from reflecting. In addition, the capacitive connection between the power planes and the resistive coating is enhanced, for example, using metallic flanges.

Abstract: The invention refers to a telecommunications system comprising a module rack that defines a core bay, a service plane and a rack interface plane where the service plane is transverse to the rack interface plane. The core bay is in part bounded by the service plane and the rack interface plane. The telecommunications system also comprises a series of electronics modules each defining an electronics orientation plane where each of the modules includes two opposed cooling surfaces oriented substantially parallel to the electronics orientation plane. Each of the electronics modules is removably secured within the core bay. The series of the electronics modules forms an array such that their electronics orientation planes are substantially perpendicular to both the rack interface plane and the service plane. The array also defines at least one coolant stream passage across each cooling surface.