Chapter 1. Introduction
OPTION PORTS
The option ports vary depending on the option modules installed.
Secondary Interfaces (SI)
The secondary interface is an additional interface to a DS1, a DSX1 facility, or some other network service, and it offers a source of timing. The type of interface depends on the option module installed. The interface includes the following:
•DSX1. Passthru for operation with a PBX (Terminal Interface - TI).
•Full Drop and Insert. Permits the dropping of data and insertion of new data into the same DS0 time slot. This SI module includes a long haul DS1 interface. It can also be used as a second DS1 interface to provide an up to 3 Mbit aggregate throughput.
Other Data Interfaces
Additional data interfaces can be installed in the option slot, and include the following:
•Nx56/64 serial interface. This module is the same as the base Nx interface but offers single or dual V.35 ports.
•Voice interface. 2/4 channel FXS/FX0/E&M.
•OCU DP. Interfaces to DDS or
•Dial backup.
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