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ACM
The ACM (ADPCM Compression Module) provides the means for a single DS1 (CEPT) line,
containing 24 (30) PCM voice circuits, to be brought into the TMS-3000 node and compressed via
GDC proprietary ADPCM compression techniques. The compressed signal is then transported
across a trunk.
ADPCM
Adaptive Differential Pulse Code Modulation (See ACM)
Aggregate
A connection between two TMS nodes where the entire trunk carries a single bundle carrying the
data originating from the TMS channels. This term has conventionally been used to define the
Aggregate Control Card trunk of the TMS. Also, see Subaggregate.
Aggregate Control Cards (ACC / ACC-Plus)
These TMS modules interface the 16.896 MHz Fast Bus with a full duplex aggregate trunk
connected to a remote node. It buffers data from the Fast Bus and reforms it according to the
transmit frame by adding overhead and frame sync bits. Piggyback cards on the Aggregate Control
Card then prepare the data to comply with transmission standards (EIA or ITU-T). The receive
section locates the frame sync bits in the receive aggregate data stream, and, using these bits as a
reference, disassembles the remainder of the data stream into channel data, channel controls, and
overhead bits. See TMS-3000 Plus.
Aggregate Trunk
A full duplex communication line which transports data between two nodes.
Alarms
These are raised when a malfunction is detected in the system. Major alarms need immediate
attention. Minor alarms are not immediately detrimental to the working of the system. Major alarms
indicate that hardware on a Common Module is malfunctioning. Minor alarms indicate that the
malfunction is in one of the Data or Voice Channel Cards.
Anisochronous
The essential characteristic of a time-scale or a signal such that the time intervals between
significant instants do not necessarily have the same duration or durations that are integral multiples
of the shortest duration.
Asynchronous
Refers to operations that do not have a common clock.
036R340-000
Issue 16
Appendix A:
Office Connunications Manager OCM-1000/OCM-2000
Installation & Operation
Glossary of Terms
A-1
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