PM550 CIM Requirements
A-1
TIWAY 1 TI505 NIM User Manual
Appendix A
PM550 CIM Requirements
A.1
INTRODUCTION
This appendix discusses biasing and terminating the TIWAY I Local Line for network
installations containing CIMs in addition to self-biased and switch-biased devices.
A.2
LOCAL LINE LENGTH
The PM550 CIM supports operation over the Local Line at distances up to 10,000 feet
and 9600 baud.
Advances in technology have provided line drivers and receivers that support Local Line
operation up to 25,000 feet. These new drivers have been incorporated in TIWAY I
compatible devices to support the extended operation. However, in networks containing
the PM550 CIM, the Local Line length is restricted to 10,000 feet and 9600 baud.
A.3
LOCAL LINE BIAS AND TERMINATION
For TIWAY I networks using the Local Line, some devices are provided with a toggle
switch to allow selection of bias or no bias for the Local Line. Other devices have
self-biasing built in and therefore have no bias switch. The CIM is provided with a
jumper which allows selection of bias or no bias.
The Siemens’ Local Line must be properly terminated at both ends of the trunk to
prevent a possible impedance mismatch that could result in signal reflections back along
the line.
Termination is required regardless of the numbers or types of devices attached to the
network.
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