| Part No. TEL–09949, Rev A |
Pre-Installation Information and Activities | June 2001 |
Page 24 of 34 |
If the application requires more NC slaves than the larger backplanes have groups, connect multiple backplanes in the enclosure using the 1-card backplane.
When combining backplanes in an enclosure, one modem card slot is lost for each type of backplane that is used. For example, two 9-modem card backplanes in an enclosure occupy 19 slots. Therefore, two 9-modem card backplanes and one 1- modem card backplane results in the use of only 19 326Xs in a 21-modem card enclosure. The maximum number of backplanes that can be combined in a 21- modem card enclosure is 11 1-modem card backplanes.
Daisy-Chaining NC Ports: Card Modems to Stand-alone Modems
When daisy-chaining NC ports between a modem card and a stand-alone modem, be aware of the following condition.
If a 326X Series Modem card is located between a Network Manager and a stand-alone modem, the modem must have software revision level 3.0 or higher (Figure 12).
326X Series Modem Card in Enclosure
(Must Have Revision 3.0 Software or Higher)
326X Series
Stand-alone Modem
NC
OUT IN
Figure 12. Daisy-Chaining NC Ports: Enclosure Between Network Manager and Stand-Alone