CANOGA PERKINS 2461 E1 Modem - Manual (Page 60)

EdgeAccess Universal Chassis System
2461 Modem User Manual 7-4
Important: Remember that the rack mounted modems must be placed in a special
slot configuration, as follows:
• The primary modem must be placed in an odd-numbered slot
• The secondary modem must be placed in the even-numbered slot to its
immediate right.
Example: Slot 3 must be paired with slot 4, and slot 7 must be paired with slot 8. In
such a configuration, the modems in slot 3 and 7 would be primary, and the modems
in slot 4 and 8 would be secondary.
7.1.1 Special Redundancy ELIMs and Cables
1. Redundant configurations require that the modems have special Redundant ELIM cards.
Once in use, these Redundant ELIM cards do not have to be replaced if the modems are
returned to non-redundant configuration.
2. Y-cables are required to duplicate (not split) the data coming from the data source. One
Y-cable is required at each end, handling the customer data.
3. A redundancy cable is required between two stand alone modems. One cable end is marked
as "Primary," and should be inserted into the primary modem (the modem connected to the
far end modem in the odd-numbered UCS slot). The other end is marked "Secondary," and
must be inserted into the secondary modem.
7.2 Setting Up Redundancy
To set up redundancy, first set up the hardware as displayed in the above diagram, including the
required Y-cable and redundancy cable. Then:
Figure 44. The Functional Configuration Screen
1. From the 2461 Modem Main Menu, type "1." The System Configuration Screen appears.
2. Type "2" to access the Functional Configuration menu.
3. From that menu, type "4" to access Redundancy Mode options.