MT90840

Preliminary Information

an address-value in the path’s Data Memory. A given output time slot is controlled by programming the Connection Memory control-address with the address-value of the source input time slot. At the same control-address the output time slot is enabled or tri-stated and other per-channel functions set up. Thus each output time slot is individually controlled, and any given input time slot might be copied to one, several, or none of the output time slots.

Transmit Path

The Transmit Path is from the serial inputs, through the Transmit (Tx) Path Data Memory, to the parallel outputs (PDo0-7). This path is controlled by the contents of the Tx Connection Memory. The Tx Connection Memory is programmed, for each output time slot, with the address-value of the source channel to be read out of the Tx Data Memory. Up to 512 channels of serial input can be switched to up to 2430 channels of parallel output.

Transmit Path Connection Memory

The Tx Path Connection Memory is structured as 2430 words of 16 bits. This supports up to 2430 DS0 channels for parallel rates up to 19.44 Mbyte/s (155 Mbps). The Tx Path Connection Memory is accessed as two-sub memories: High and Low. The Connection Memory Low (2430 X 8) is the low byte of the word, and is programmed with the address-value of the serial-input source channel. The Connection Memory High (2430 x 8) is the high byte of the word. Connection Memory High holds the high-order bit(s) of the source address-value, and is also programmed to control per-channel functions such as output driver-enable and programmable control outputs.

Transmit Path Data Memory

The Tx Path Data Memory is structured as 512 words of 8 bits. Serial input time slots are converted to parallel bytes and copied to the Tx Path Data Memory sequentially, serial-stream by serial-stream. The lowest address of the Tx Path Data Memory is STi0-channel0, the next is STi0-channel1, and so on. At 2 Mbps, with 32 channels per STi pin, STi1-channel0 would be 32 addresses higher than STi0-channel0. The Tx Path Data Memory is read out to the parallel outputs by the Tx Connection Memory.

Receive Path

The Receive Path is from the parallel inputs (PDi0-7), through the Receive (Rx) Path Data Memory, to the serial outputs. This path is controlled by the contents of the Rx Path Connection Memory.

The Rx Path Connection Memory is programmed, for each output time slot, with the address-value of the source channel to be read out of the Rx Path Data Memory. Up to 2430 channels of parallel input can be switched to up to 512 channels of serial output. Each output byte, whether switched data or message mode data, is read from memory and passed to the parallel-to-serial converters, and then driven out the serial port.

Receive Path Connection Memory

The Rx Path Connection Memory is structured as 512 words of 16 bits. This supports up to 512 DS0 channels. The Rx Path Connection Memory is accessed as two sub-memories: High and Low. The Connection Memory Low (512 x 8) is the low byte of the word, and is programmed with the address-value of the parallel-input source channel. The Connection Memory High (512 x 8) is the high byte of the word. Connection Memory High holds the high-order bits of the source address-value, and is also programmed to control per-channel functions such as output driver-enable and direction-control.

Receive Path Data Memory

The Rx Path Data Memory is structured as 2430 words of 8 bits (1 byte). Parallel input time slots are copied to the Rx Path Data Memory sequentially. The Rx Path Data Memory is read out to the serial port by the Rx Path Connection Memory.

Bypass/Parallel-Switching Path

The Bypass/Parallel Switching path is from parallel input to parallel output. Data received at the parallel inputs (PDi0-7) is copied to the Rx Path Receive Memory, and may be passed to the parallel outputs (PDo0-7) under control of the Tx Path Connection Memory.

Bypass

In ring timing modes (TM1 and TM2) this is a bypass path. When the Bypass bit (PPBY) for a given parallel output channel is set in the Tx Path Connection Memory, the same-address parallel input channel is copied (bypassed) to that parallel output channel. This allows data channels not destined for the local node to be bypassed to the output port and down the ring. “Broadcast” channels destined for every node can also be bypassed, since PPBY is an output control, and it does not affect the availability of the Receive Parallel data for switching to the serial port or monitoring through the CPU interface.

Parallel Switching

In Parallel Switching Mode (TM4) this is a switching path, and the Tx Path Connection Memory is

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Mitel MT90840 manual Transmit Path, Receive Path, Bypass/Parallel-Switching Path
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MT90840 specifications

The Mitel MT90840 is an advanced telecommunications device designed to enhance connectivity and communication capabilities for various applications. With its robust array of features and technologies, the MT90840 is well-suited for businesses looking to improve their communications infrastructure.

One of the standout features of the Mitel MT90840 is its integration of voice and data services. This allows users to manage their communications more efficiently, streamlining operations and reducing costs. The device supports a wide range of voice codecs, ensuring high-quality audio during calls and providing flexibility for users who may require different standards for different applications.

Another key characteristic of the MT90840 is its scalability. The device is designed to grow with the needs of a business. It supports multiple lines and can be configured to handle an increasing number of users without compromising performance. This scalability is particularly advantageous for organizations that may undergo growth or changes in their communication needs over time.

The Mitel MT90840 also incorporates advanced networking technologies, such as VoIP (Voice over Internet Protocol). This allows users to make voice calls using the internet rather than traditional phone lines, reducing costs for long-distance calls and improving overall communication efficiency. The device is equipped with features that support secure, encrypted communication, further protecting sensitive data and conversations from potential breaches.

Additionally, the MT90840 is designed with user-friendliness in mind. It features an intuitive interface that simplifies operation, making it accessible even for those who may not be tech-savvy. The device is compatible with various peripherals, such as headsets and conferencing equipment, further enhancing its usability in diverse settings, from small offices to large conference rooms.

Moreover, the Mitel MT90840 offers excellent interoperability with a variety of third-party applications. This flexibility enables organizations to integrate the device into their existing systems seamlessly, thereby enhancing productivity without requiring a complete technological overhaul.

In conclusion, the Mitel MT90840 stands out as a versatile and reliable telecommunications solution. Its rich feature set, including voice and data integration, scalability, VoIP capabilities, user-friendly interface, and interoperability, makes it an ideal choice for businesses looking to elevate their communications strategy.
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