Digital Stations For Data Communications Only - AT&T Merlin II Feature Module 2 Data Communications Manual

Digital Stations for Data Communications Only

3-6 Digital Stations for Data Communications Only
Your Master Planning Form identifies any stations where personal computers
or data terrninals are connected to digital station jacks on the control unit
through Modular Processor Data Modules (MPDMs) for data communications
only. (The "Person, Location, or Function" column contains the phrase "DO-
MPDM.") An MPDM is a device that converts digital data signals sent
through the control unit to EI.A RS-232-C data signals that the computer can
receive and converts the computer's sending signals back to digital data.
The following equipment is required for a digital station equipped for data
communications only:
• Modular Processor Data Module (MPDM) equipped with an RS-232-C
Interface
• Data terminal or computer
• Cables and connectors for connecting the components
Before you activate these stations, set the switches on the
NOTE:
MPDM faceplate and the RS-232-C Interface (see "MPDM Option
Switches" under "Local Host Computer Access").
Figure 3-4 is a connectivity diagram that shows a typical configuration for data
communications only at a digital station.
FIGURE 3-4 A digital station equipped for data communications only.
Digital
station
module
1 The 4-pair modular cord runs from a jack on the 8-Digital Station (008D)
Module at the control unit to a standard telephone wall jack at the data
terminal location. The maximum cord length for this connection is
1000 feet.
2 A 4-pair modular cord connects the MPDM to the wall jack.
3 Standard RS-232-C connectors and cable connect the MPDM to the data
terminal. The maximum cable length is 17 feet.
If a number of MPDMs are to be connected at a common
NOTE:
location, you can put as many as eight in one multiple mounting
rather than installing each in a stand-alone mounting. A multiple
mounting reduces the number of ac power sockets needed to power
the MPDMs. See the documentation that came with your MPDM for
information on the multiple mounting connections.
Data
terminal