System 25 Description
System 25 (Figure
System 25 uses intelligent port circuits equipped with distributed network processor elements to provide (essentially) nonblocking voice and data switching.
Voice communications features combine traditional telephone features, such as Call Transfer and Hold, with advanced features, such as Individual and Group Call Coverage,
Data communications | features | provide switched data | connections | supporting transmission of |
voice and data over | Premises Distribution System wiring. Data connections can be made | |||
between two digital data modules (asynchronous data | units), two | analog modems, or between | ||
an analog modem and a digital | data module. Release | 1 Version 2 | (R1V2) also provides access | |
to STARLAN NETWORKs. |
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The system has data modules that provide an
System 25 supports the following:
●Trunk and Network
Signaling on incoming and outgoing trunks (dial pulse only on DID trunks).
—Loop Start (LS)
— Ground Start (GS) (Strongly Preferred over Loop Start in most installations)
— Tie Trunks (Type I and Type I Compatible E&M, Type V Simplex)
—Direct Inward Dialing (DID)
●Voice Terminals –
MERLIN®
● Data | Facilities |
— Digital Data End Points –
—Analog Data End Points —
—STARLAN NETWORK Access (V2 only).
●Networking Capability
—Tie Trunks
—Tandem Trunking
— Endpoint in Electronic Tandem Network (Tributary only, not Satellite)
— Endpoint of Enhanced Private Switched Communications Services (EPSCS)
—Endpoint of Tandem Tie Trunk Network (TTTN)
—Endpoint of Common Control Switching Arrangement (CCSA).