Справочник Пользователя для Siemens 500 NIM

 

PM550 CIM Requirements

2.

If more than one CIM is attached to a Local Line, place CIMs at the
extreme ends of the Local Line trunk.  Install the jumpers provided
with the outermost CIMs in accordance with the instructions in the
PM550 CIM User’s Manual, Manual Number PM550–1101154–4. This
will apply the correct bias to the Local Line to prevent oscillations of
the CIM receivers.

To terminate the Local Line, replace the existing terminating resistors
inside the outermost CIM tap housings with 150-ohm resistors between
the LLM+ and the cable shield, and also between LLM– and the cable
shield. This resistance value is 150 ohms in each instance, and the
connection is in accordance with instructions inside the tap housing.
The combination of termination resistors in the CIM together with
these 150-ohm resistors, provides the correct Local Line termination.

Figure A-1 illustrates the proper placement of the CIMs and the
termination resistors for networks having CIMs and NIMs without the Bias
Switch.

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