Multitech CC1600-11L User Manual page 11

9. Firmly seat the modem card into the backplane connector.
10. Repeat steps 7 through 9 for the remaining modems.
11. Connect an RS232C cable to the DB25 connector (25-pin female connector) on the backplane of the
rack. Start by connecting the RS232C cable to the right-most channel (slot 1) as viewed from the back of
the rack.
Note: Any cables connected to the computer should be shielded to reduce radio frequency interference.
Keep track of which computer channel belongs to which modem in the rack. Most computer interface buses
are grouped in sixteens, which enables you to match modem and computer channel numbers.
12. If you are connecting your phone line directly to an RJ11 jack on the backplane of the rack, plug the
telephone cord into the RJ11 jack on the appropriate modem.
If you are connecting a -11L rack to leased lines or leased lines with dial back-up, a Dial/Leased Splitter
is required between the leased line jack and the RJ11 jack on the backpanel of the rack. The single
RJ11 plug connects to the RJ11 jackon the backpanel of the rack. The RJ11 jack labeled Leased
connects to the leased line connector. If dial-back up is used, the RJ11 jack labeled dial should be
connected to the dial-back up line.
Note: The Dial/Leased Splitter is a custom part (a "Y" cable) which includes an RJ11 plug that plugs into the
RJ11 jack on the backplane of the rack and is a 5-inch-long six-conductor cable terminated at two RJ11
jacks. One jack is labeled Leased and the other Dial.
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48 Volt Power Supply
Figure 2-2. Cable Connections
Chapter 2 - Installation
Slot Number
DB25 Connector
(SELV Circuit)
RJ11 Connector
(TN Circuit)
Positive
Lead
Negative
Lead
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