This is accomplished by multiplexing the control signals along with the digitized voice signals.
As show in the diagram on the right , the MP9701 is used with the MP9711, which provides a dual channel subscriber interface.
SPECIFICATIONS
| Electrical Interface: |
Two RJ11C telephone connectors are provided. A separate 25-pin connector is wired in parallel with the phone jacks for convenience in large installations. Interface signals include Tip and Ring plus four control signals. |
| Frequency Response: |
Input filter limits the passband to 300-4000 Hz. |
| Operating Mode: |
The MP9701 will operate with either single line telephones or 5-button keysets. Either dial pulse or multitone signaling (DTMF) may be used. |
| Environmental: |
Operating temperature is 0 degress C to +50 degrees C. Relative humidity up to 95% (non-condensing), altitude up to 10,000 feet. |
OPERATING FEATURES
The figure on the right illustrates the principal circuits contained in the MP9701. The control signals from both exchanges, ringing and lamp control, are detected and multiplexed along with internal controls and applied to the CAM-1 card. The audio signal is brought through a bridge and applied to the CVSD (continuously variable sloped delta) circuit where it is converted to an equivalent digital signal and then sent to the CAM-1 card. The CAM-1 card multiplexes all of the signals from all of the port cards into one aggregate signal, which is sent through the fiber optic cable to the remote end.
At the remote end the CAM-1 card recovers the light pulses, demultiplexes the aggregate signal, and supplies the receive signals to the respective port cards. On the MP9701 card the digital audio signal is brough through a second CVSD circuit to recover the audio. The control signals, A and off-hook, are demultiplexed and applied to the exchange interface.
STATUS INDICATORS
The status indicators on the MP9701 are color coded to simplify operation. A green lamp provides positive indication of normal operation. Red lamps are used to indicate a loss of traffic or an alarm indication. Yellow lamps are used to indicate that the associated signal is present at the interface.
The following paragraphs describe the different indicator lamps used on the MP9701.
| PWR 9701 (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. |
CHI RING
CHI OFF HOOK CH2 RING
CH2 OFF HOOK
(yellow) |
An on condition indicates that the associated interface signals are present. |
INSTALLATION (CHASSIS)
The MP9701 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.
