23
a modem, multiplexer or other DCE device. This cable should be of the
shortest possible length--we recommend 6 feet or less. When purchas-
ing or constructing a null modem interface cable, use the pin diagrams in
Appendix E on page 30, Appendix F on page 31, and Appendix G on
page 32 as guides.
Note
Pin-out requirements for null modem applications vary between
equipment manufacturers. If you have any questions about a
specific installation, please contact Patton Electronics Technical
Support.
4.5 CONNECTING THE E1 INTERFACE
The Network Line Interface is an eight position keyed modular jack con-
figured as a RJ-48C. This interface will need to be configured to match
the line parameters (i.e. framing, line coding, etc.) supplied by the central
office.
Figure 12.
NetLink-E1™ twisted pair line interface.
Note
If the NetLink-E1™ is being used for private short range modem
applications, the twisted pair cable connected to its port will
need to be a cross-over cable. See Appendix D on page 29 for
Interface pin assignments.
4.6 CONNECTING DUAL COAX BNC (75 OHM)
In addition to the 120 Ohm twisted pair connection, the Model 2707RC,
when used with the 1001RCM11575 rear card, is equipped with dual
female BNCs (TX and RX) for connection to a 75 ohm dual coax G.703
network interface.
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
(RX) Receive (Ring)
(RX) Receive (Tip)
Shield
(TX) Transmit (Ring)
(TX) Transmit (Tip)
Shield
No connection
No connection
Signal Name
RJ-48C Jack
