American Telecom AM64/128A - Manual (Page 46)

AM 64/128A User Manual Appendix B – Internal Link Settings
A-7
Interface Modules:
RS530 Interface Module:
J1 – V36 and RS530 Circuit 103 (Transmit data) Circuit Termination – This link connects a 120 ohm load
resistor across the 103 circuit in position 1-3. This helps maintain signal rise times and minimises reflections
at greater than 9.6 kbps over long lines. At lower rates and over short lines the termination resistor may
be omitted, (link set position 1-2).
J2 – V36 and RS530 Circuit 113 (External Signal Element Timing) Circuit Termination – This link connects
a 120 ohm resistor across the 113 circuit in position 1-3. This helps maintain signal rise times and minimises
reflections at rates greater than 9.6 kbps over long lines. At lower rates and over short lines the termination
resistor may be omitted, (link set position 1-2).
X.21bis Interface Module;
There are no links on the X.21BIS Interface module
G.703 Interface Module;
There are no links on the G.703 interface module.
WARNING
Only authorised personnel can be allowed to open the Line Terminating Unit case to change the
link settings. Misuse or any modifications carried out to this unit other than in accordance with
the instructions supplied, will invalidate the guarantee CE approval.
J1 – Circuit 103 Termination.
J2 – Circuit 113 Termination.