Multiplexer
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STM-8, 16, 24HS

Features

• Multiplex statistically 8, 16 or 24 async channels onto a single sync link

• Asynchronous channel data rates up to 19.2 kbps

• Composite link data rate up to 64 kbps

• Composite link interfaces: V.24/RS-232, V.35, X.21 and RS-530

• Independent hard and soft flow control for each channel

• Control signal passed end-to-end, bi-directional

• Menu controlled configuration and diagnostics

• Downloading of system parameters

• Permanent storage for system parameters

• Password secured access

Description

• The STM high speed statistical multiplexers, integrate up to 24 asynchronous channels onto a single synchronous link. Three models are available:

• STM - 8 with 8 asynchronous channels

• STM - 16 with 16 asynchronous channels

• STM - 24 with 24 asynchronous channels.

• The channel data rates are from 75 bps up to 19.2 kbps. The synchronous composite link operates at up to 64 kbps and has four selectable interfaces:

• V.24/RS-232

• V.35

• X.21

• RS-530.

• Powerful error detection and automatic retransmission ensures error free performance.

• The STMs feature independent hard and soft flow control for each channel. End-to-end flow control can be initiated from DTE to DTE or from the STM channel to the remote DTE. Several characters for X-ON and X-OFF are provided, enabling compatibility with most applications.

• Any sub-channel can be used as a command port to configure the entire system or to perform diagnostic tests. Password secured access prevents unauthorized alteration of the system configuration.

• The STMs feature permanent storage of the user-programmed system configuration, using non-volatile memory and downloading of the configuration parameters.

• Comprehensive diagnostic capabilities provide local and remote loopbacks on the sub-channels or on the composite channel, as well as testing of the modems between two STM units.

• The STMs are designed for desktop or 19" rack installation. Sub-channel connections are made via RJ-45 connectors located on the front panel.

• The STMs can be connected to RAD's APS and SPS packet switching products for expanding the number of async channels in PAD/FRAD applications