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DS1 Facility Options
A Digital Signal Level 1 (DS1) facility is a transmission system that transports digital signals in the DS1 format. The interface that allows the connection of DS1 facilities to the system is the 100D, 100R INA, and 100DCD modules. Through these modules, voice and data calls can be made or received using a DS1 facility.
Twenty-four Digital Signal Level 0 (DS0) channels, each operating at 64 kbps, plus framing bits, are multiplexed, forming a DS1 signal of 1.544 mbps. Each DS0 channel within the DS1 signal corresponds to a logical port. Although there is only one physical jack, each 100D, 100R INA, or 100DCD module supports up to 24 logical ports (one for each channel).
In DS1 format, calls to other digital PBXs or telephone company foreign exchanges (FXs) remain digital. Signals do not need to be converted to analog for acceptance by the connecting trunk, except for networked applications such as off-premises extensions or situations where your communications equipment does not allow a DS1 digital interface. In addition, the 100D, 100R INA, or 100DCD module can be configured to work with T1 or PRI service.
To connect the 100D module to an outside DS1 facility, a channel service unit (CSU) is used. The CSU regulates the transmission into and out of the 100D, 100R INA, or 100DCD module so that the module matches the transmission of the outside facility.
Both ends of the DS1 facility must be able to communicate. To ensure this, the following options are set during system programming to match the transmission of the outside DS1 facility:
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