||The MP917 will operate with synchronous/isochronous data rates of 37.5, 75, 150, 300, 600, 1200, 2400, 4800, 9600 bps; 19.2, or 38.4 kbps. It will also operate with asynchronous data up to 38.4 kbaud.
||The MP917 multiplexes 6 different control signals along with the clock and data. These are the RS, CS, TR, DM, RR, and the IC control signals.
||Signal levels and format conform to the requirements of EIA RS-449 or MIL-STD-188-114, balanced or unbalanced. Two digital connectors are provided. The DCE (female) connector is used for connecting a terminal or computer; the DTE (male) connector is used when interfacing with a modem.
||Operating temperature is 0 degrees C to +50 degrees C, relative humidity up to 95% (non-condensing), altitude up to 10,000 feet.
The MP917 operates as a buffer between the external interface and the CAM-1 (channel allocation master) card in Versimux. It combines the interface and test control signals into a master control signal. It then passes this signal, along with the transmit data and clock signals, to the CAM-1 card. The CAM-1 card combines the three signals from each of the port cards into a master aggregate signal. The master signal is used to turn the light source on and off, generating a series of light pulses which are sent over the fiber optic cable. At the remote end the process is reversed. The three main signals are recovered from the CAM-1 card and supplied to the appropriate port card. The master control signal is then demultiplexed and applied to the interface along with the data and clock signals.
The MP917 port may be operated as a modem link or as an interface extender, as shown in the diagrams below. When the MP917 is used as a modem link both ends of the link appear as modems. When it is used as an interface extender, the link appears as a modem to the terminal and as a terminal to the modem.
In either configurations, the MP917 will supply both transmit and receive clocks or operate with an external transmit clock, as required.
The status indicators on the MP917 are color coded to simplify operation. A green lamp provides positive indication of normal operation. Red lamps are used to indicate an alarm condition or an interruption in data traffic. Red lamps should be off for normal operation. Yellow lamps are used to indicate that the associated interface signals are present at the connector.
The following paragraphs describe the different indicator lamps used on the MP917.
|PWR 917 (green)
||An on condition indicates that both positive and negative operating voltages are present.
|OUT SYN (red)
||An on condition indicates that the local receiver has lost synchronization.
|RS, CS, TR, DM, RR, SD, RD (yellow)
||These lamps will be on when the associated interface signals are present at the connector.
|TEST ERR, TEST, REM IN TEST (red)
||These lamps are used to indicate the status of a diagnostic test.
The MP917 port card is installed in the Model OMC-14 Versimux chassis. This chassis holds a total of 14 multiplexer port cards and mounts into a standard 19" rack. Data port cards and telephone port cards may be combined in the same chassis. Power supplies and channel allocation master cards are also required in each Versimux chassis.
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