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metal housings for electronic components

asymmetric digital subscriber line components, namely, central office and remote terminal telecommunications hardware modules, access concentrators, test sets, and central office data collection interfaces, all with electronic mountings therefor; network channel termination equipment, namely, tie trunk interface module, dial long line module, data station terminations module, all with electronic mountings therefor, repeaters, and power supplies; access multiplex components, namely, electronic mountings for central office units, ATM interface modules and associated digital subscriber line modules; intelligent envelope delay equalizers; 4-wire tandem D-4 channel units; intelligent equalized transmission only channel units; T1 station products, namely, network interface unit modules, network interface units with performance monitoring modules all with electronic mountings therefore, and T1 repeaters; T1 test units, namely, looping sets and performance monitoring data retrieval sets; T1 maintenance switch systems, namely, common control units, line cards and electronic mountings therefor, DS3 products, namely, network interface units, and electronic mountings therefor; high-bit-rate digital subscriber line components, namely, central office and remote terminal units, and central office maintenance units, all with electronic mountings therefor; litejacks and quadjacks