Point-To-Point Private Network - Coastcom D/I Mux III System User Manual

Dual 2-Wire Foreign Exchange Subscriber (FXS) line cards connect directly to telephones
to supply standard telephone service. The circuits are assigned numbers at the digital
switch and standard telephones call out or receive calls.
The FXS card can also be used to access the available 800 and Megacom services. A
user with heavy customer service 800 lines has an economical and direct access to the
public networks 800 service switch.
Digital Dataphone Systems (DDS) Compatible Data
Data that is compatible with the DDS standard is distributed by the public digital switching
network. Most DDS data connections are point-to-point connections between two circuits.
The equipment at the far end does not have to be Coastcom equipment. Any equipment
that supports a compatible data rate and DDS type can communicate with Coastcom
equipment.
Office Channel Unit Data Port (OCUDP) line cards support 2.4, 4.8, 9.6, 19.2, 56 and 64
Kbps data rates, and are DS0A DDS type circuits. The public digital switching network
can take data from several OCUDPs, and distribute the data to divergent locations.
The OCUDP also includes an option for Switched 56 operation. In the Switched 56 mode
the data is directed to various locations by the user. A keypad on a Switched 56 Channel
Service Unit/Digital Service Unit (CSU/DSU) (ancillary equipment) can then call up other
Switched 56 locations similar to a standard telephone.
Coastcom's 5-port Subrate Data Multiplexer (SDM) line card offers DS0B DDS data rates
of 2.4, 4.8, 9.6, and 19.2 Kbps. The circuits are set up in a point-to-point configuration
with devices of the same data rate and DDS type. The DS0B DDS format makes efficient
use of bandwidth by placing up to five data circuits onto a single 64 Kbps DS0
transmission channel. In the Proprietary mode, the DS0B can support synchronous and
asynchronous transmission.
Coastcom's single-port SDM line card offers DS0A DDS type data at rates of 2.4, 4.8, and
9.6 Kbps. A single DS0A data circuit takes up all of a 64 Kbps DS0 transmission channel.

Point-to-Point Private Network

In a point-to-point private network, two D/I Mux III systems communicate only with each other, as
depicted in Figure 2-2. The T1 link between the two D/I Mux III systems is dedicated. The link
can be a variety of transmission types, including, microwave, fiber optic, or a leased line.
Communications carriers offer dedicated T1 links so a corporate network can remain private even
though it is being transported by several organizations.
Chapter 2. Applications
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