System Manager Controller II Module Set
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Features
- Internal Stratum 3 Clock with Holdover
- Hitless Switchover between Online and Standby Module
- Ability to Accept Multiple BITS Clock inputs
- Alarm Contact Closures
- Support for 8 Concurrent Users
Introduction
The System Manager Controller IIA (SMC-IIA) controls operation of the DNX system and the adjunct PSX-5300 Protection Switch, and replaces the previous SMC-II (which is still available). The SMC-IIA consists of a controller (front) module and an interface (rear) module, which are both single slot cards. The controller module is half height, and the interface module is a full slot height. The SMC-II and SMC-IIA both use the same controller (front) module.
Capabilities and Features
The SMC-II utilizes the dual communication busses on the DNX midplane to control modules within the nest and provide several methods for communicating with and controlling the DNX system. The intuitive VT100 terminal interface offers direct or remote connectivity. Remote connections to the System Manager are made using the internal modem or by Telnet. Additionally, system devices and ports can be configured, monitored, diagnosed, and provisioned using Simple Network Management Protocol (SNMP).
The DNX supports up to three user-defined clock sources. These sources are derived from Network Synchronized Timing or Internal Timing. Network Synchronized Timing includes line timing provided by DNX channel cards or timing provided by a stand-alone source, such as a Timing Signal Generator. The internal timing source is a Stratum 3 clock, which is used as a reference to generate system-clocking signals. In the event of a reference clock failing, the DNX automatically selects an alternate input based on the source clock configuration setting. Port timing is provided by any of the following optional channel cards: Octal T1/E1 (ports 1-8), Octal High Speed (ports 1-8), T3 (T1 ports 1-28), and Quad T1 (ports 1-4).
When the Internal timing source is used to deliver a timing reference to the DNX, the state of operation is called Free Run Mode. As with the requirements of Stratum 3 clock sources, there is a back up mode for use in the event all defined clock locations are lost. This back up mode is derived from Hold Over timing, which facilitates redundancy switching and allows maintenance actions to be performed on the SMC-II without affecting service. External timing is provided via two source connectors on the SMC-II rear card. These inputs allow the DNX to use a 64 Kbps composite clock from a stand-alone reference.