short-haul physical (electrical) delivery of DS1 and DS3 signals --
usually for cross-connect purposes -- known as DSX-1 and DSX-3.
These specifications, while predominantly composed of general signal
specifications, also concretely reference the electrical characteristics
of metallic interconnection points, so these are not entirely
"abstract" specifications for a "different type" of DS1 signal. Thus,
they fail to conserve the DSn vs. (Tn, OCn, etc.) conceptual distinction
entirely.
There also dwell, in considerably greater obscurity, standards for
electrically cross-connecting (relatively) low-speed SONET carrier
signals - STSX-1, STSX-3.
--
Alex Balashov
Evariste Systems
Web : http://www.evaristesys.com/
Tel : (+1) (678) 954-0670
Direct : (+1) (678) 954-0671
Mobile : (+1) (706) 338-8599
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