Master Controller Module (MCU)

The MCU module controls the operation of all other modules in the system, allocating them time slots on the backplane and sending configuration information. It enables: 

• Status Monitoring - The processor constantly polls the status of individual transport modules and makes failsafe decisions based on this status. The module also monitors the frame temperature and the power supplies of the system.
• Hardware Alarms - The alarm port on the MCU module provides seven GPIO relay contact closures in order to indicate critical status and alarm conditions.
• Hot-Swappable Operation - Once a Multi-Channel Frame is configured, it is able to continue to operate in the event of an MCU card failure as each card will hold its local settings. The MCU can then be “hot swapped” and will recover the current system settings from the individual modules.
• Configuration Pre-sets - The MCU can store pre-defined configurations as pre-sets. A pre-set can also be used by the alarm system and for backup scenarios. Also, a pre-set can be loaded manually from the NMS GUI or external switch inputs

E1/T1 Transport Module

The T1/E1 module is one of the most common choices for audio transport due to the reliability and widespread availability of T1 and E1 circuits.

Key advantages include:

• Line Redundancy - Each module comprises two T1/E1 framer devices and two line interfaces enabling line redundancy.
• Drop & Insert  - The T1/E1 module provides a failsafe circuit that, in the event of totalfailure of the module, connects the upstream T1/E1 circuit to the downstream T1/E1 circuit, thereby preserving the integrity of the data path to any other devices on the network ring.
• Contribution Data & Clocking - Any data received by the X.21 port is then placed onto the T1/E1 transport link. In combination with the external clock input, this module provides versatile system timing options to connect to almost any network.

Universal Audio Module

The slimline universal audio module for the APT E1/T1 MULTI-CHANNEL CODEC offers a 37-way D Type connection. Four physical slots on the 1U chassis allow the population of up to three payload modules (Audio or Aux) and one T1/E1 transport card.

This results in 12 simplex and 6 duplex channels. Each module offers four audio channels which can be either four encode, four decode or two encode and two decode.

Offering a high level of flexibility and channel density, the universal audio card can provide either dual stereo or quad mono channels in simplex mode. Individual channels can be enabled and disabled or routed to different destinations. For example, on a T1/E1 link, stereo A can go to the main T1/E1 link and stereo B on the secondary, the drop and insert circuit.

The E1 module is available with both RJ45 and BNC connectors.