Chapter 2. Applications
42
Figure 2-2. Point-to-Point Private Network
4-Wire Trunks
Private Branch Exchanges (PBXs) distribute calls from a local telephone central office.
PBXs are an economical way to minimize the connections, and cost, of doing business
with the local telephone company. The connections to the telephone company are
trunked (shared). Historically, the common connection between PBXs and local central
offices has been 4-Wire Earth and Magnet (E&M) trunks.
Coastcom offers 4-Wire E&M line cards for connection of PBXs within a private T1
network. Corporations that conduct a large amount of communication between their
various facilities can benefit by dedicating a T1 network to internal communications.
High-Speed Data
A Dual Synchronous Data Channel Unit (DSDCU) can transfer data many times faster
than an analog modem. The point-to-point network is required because the DSDCU
requires more than one channel. High-speed data links can be used to transfer or backup
data.
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