Abstract: An in-service line monitoring technique to detect and isolate marginal and failed digital transmission equipment within a digital telecommunication system having at least two end terminals. At selected terminal and repeater locations, a digital error detector monitors the bit error rate for each location. The detected BER is truncated to include at least the most significant digit and the exponent of the BER. The truncated BER is stored and then encoded for transmission back to the command center usually located at an end terminal. At the one end terminal the encoded BER is stored and displayed upon request. By being able to monitor the truncated BER at any location or direction, maintenance personnel are able to determine when a link in the system is beginning to deteriorate well before a complete path failure occurs.

Abstract: In-service line monitoring apparatus to detect and isolate marginal and failed digital transmission equipment within a digital telecommunication system having at least two end terminals. At selected terminal and repeater locations, a digital error detector monitors the bit error rate for each location. The detected BER is truncated to include at least the most significant digit and the exponent of the BER. The truncated BER is stored and then encoded for transmission back to the command center usually located at an end terminal. At the one end terminal the encoded BER is stored and displayed upon request. By being able to monitor the truncated BER at any location or direction, maintenance personnel are able to determine when a link in the system begins to deteriorate well before a complete path failure occurs.

Abstract: A pair of bolts are welded to axially spaced apart points on a base plate in an upright position to provide fixed reference points for supporting a horn antenna. Axially aligned trunnion pipes on the antenna are rotatably attached to an associated tubular enclosure at points corresponding to the locations of the bolts. Each of the bolts extends through an opening in one side of an associated enclosure, with the one side being sandwiched between a pair of nuts. Elevation adjustment of the antenna is accomplished by rotating one of the nuts for raising or lowering one of the enclosures and the associated side of the antenna. The elevation of the antenna is maintained by threading the associated other nut of the pair thereof against the side of the enclosure.

Abstract: A horn antenna is supported by a pair of axially spaced apart trunion assemblies which are rigidly attached to the upper one of a pair of nested ring shaped members, the lower ring member being rigidly attached to a platform. Flat ring shaped flanges on the tops of the members are in contact for rotatably supporting the upper ring member in the lower ring member. Rotation of the antenna is accomplished with a turnbuckle that is connected between the perimeters of the two flanges. Each trunion assembly comprises a bolt that is welded to the top of the upper flange and that has a nut thereon supporting one side of the antenna. Elevation adjustment of the antenna is accomplished by threading the nut on the trunion bolt for raising or lowering the associated side of the antenna.