Local Host Computer Access - AT&T Merlin II Feature Module 2 Data Communications Manual

Local Host Computer Access

Your Master Planning Form identifies the station jacks that should be
connected through MPDMs to a local host computer. (The "Person, Location,
or Function" column contains the phrase " LHCA-MPDM." ) Some or all of
the digital station jacks for the local host computer may be administered as a
data hunt group to provide a common access number.
Setting up local host computer access requires the following:
• Local host computer
• MPDMs equipped with RS-232-C Interfaces
• Cables and connectors for connecting the components
Be sure to set the switches on the MPDM faceplates and the
NOTE:
RS-232-C Interfaces as described in "MPDM Option Switches" before
activating local host computer access. Some computers act as DCE
devices and may require an MTDM or special wiring. If an MTDM can
be used, the switch settings are the same as MPDM but you don't
need to set auto answer.
Figure 3-7 shows the connectivity diagram for a typical local host computer
access configuration.
FIGURE 3-7 Connectivity for local host computer access.
Digital
station
module
1 The 4-pair modular cord running from the jack on the 8-Digital Station
(008D) Module at the control unit terminates at a standard telephone wall
jack at the MPDM location. The maximum cable length is 1000 feet.
2 A 4-pair modular cord connects the MPDM to the wall jack.
3 Standard RS-232-C cables and connectors connect the MPDM to the local
host computer. The maximum cable length is 17 feet.
NOTE: If a number of MPDMs are to be connected at a common
location, you can put as many as eight in one multiple mounting
rather than having 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.
2
1
MPDM
MPDM
MPDM
3
,
Local
host
computer
\
Local Host Computer Access 3-9