4
October
2003
8400-A2-GZ40-10
Installing Two SCP Cards in the Same DSLAM
Two SCP cards may be installed in one DSLAM to provide redundancy or load
sharing. There are three basic configurations for paired SCP cards:
Y-Cable
– The OC3 ports of the two SCP cards are connected to the same
uplink device. If the active SCP card fails, the backup SCP card automatically
becomes the uplink. See
Equipment List
on page 15 for available Y-cables.
Dual Link
– Automatic switching occurs in the event of failure, but the SCP
cards are connected to different uplink devices.
Load Sharing
– Both SCP cards are active, and connected to different uplink
devices. In the event of the failure of one of the cards, Dual Link redundancy
must be manually enabled.
If you use two SCP cards configured for redundancy, and intend to manage the
chassis through the active card’s Ethernet port, each card must have its own
connection to your hub (through the connector marked LAN Slot A or B). The cable
cannot be switched after the backup SCP card becomes the active card. Also,
since the two SCP cards share the same MAC address, they cannot both be
connected to switch ports on your Ethernet switch.
