PM8621-BI PMC-Sierra, Inc., PM8621-BI Datasheet - Page 30

• Manufacturer Part Number: PM8621-BI
• Description: Driver, NSE/SBS Narrowband Chipset Driver
• Manufacturer: PMC-Sierra, Inc.

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2021248, Issue 1
Figure 6: NSE/SBS Switching Fabric – Default vs. Custom LVDS Wiring
1+1 and 1:N Port Protection
Figure 7: 1+1 Port Protection Before and After a Switchover
The chipset driver supports 1+1 and 1:N port protection. A 1+1 port protection (Figure 7)
involves a pair of logical ports. One port is labeled as the working and the other as protection.
These labels are arbitrary and active traffic could pass through either port after a switchover.
Traffic is multicast to both the working and protection egress ports at all times. Functions are
available to group/ungroup logical ports and perform switchovers for the 1+1 port protection.
Transmit
Transmit
Transmit
SBS #0
SBS #1
SBS #7
PMC-standard SBS/NSE
Other Ingress
Other Ingress
0
1
7
Ingress Port
Ingress Port
Ingress Port
Ingress Port
Protection
Protection
Working
Working
NSE-8G
Wiring
Port
Port
0
1
7
Receive
Receive
Receive
SBS #0
SBS #1
SBS #7
Other Egress
Other Egress
Egress Port
Egress Port
Egress Port
Egress Port
Transmit
Transmit
Transmit
Protection
Protection
SBS #0
SBS #1
SBS #7
Working
Working
Port
Port
Custom SBS/NSE Wiring
Narrowband Chipset Device Driver Manual
0
1
7
NSE-8G
Narrowband Chipset Overview
Before Switchover
1
0
7
After Switchover
Receive
Receive
Receive
SBS #0
SBS #1
SBS #7
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