CANOGA PERKINS 9140 Four-Port SNMP Managed Fast Ethernet Switch - Manual (Page 13)

EdgeAccess SNMP Managed Fast Ethernet Switch
Model 9135/9140 1-3
1.2 EdgeAccess 9135/9140 Redundant Switch
Application
The application shown in figure 1-2 represents a carrier style circuit that provides 100Mbps Transparent
LAN Service (TLS) and fiber optic path redundancy between customer or user locations. The design uses a
NEBS Level 3 compliant 9119 media converter and 9140 Four-Port switch at the central location, and
SNMP managed 9140 Fast Ethernet Fiber Optic switches at the edge of the network. This example shows a
centrally located 9119 and 9140 attached to 10/100BASE-TX switch based UTP interfaces and converting
from the received copper signal to the single mode optical waveform. The optical interfaces are in turn
connected to the 9140 at the edge of the network where they terminate the single mode fiber from the
central site and offer UTP or multimode optical interface for connection to the user equipment.
In the circuit with fiber path redundancy, the central 9140 has two 100BASE-FX single mode optical
interfaces configured as a redundant pair, which are then connected by divergent optical paths to the 9140s
at the customer premise. If a loss of light is detected at the receiver due to a fiber cut, the units will switch
to the fallback or redundant pair almost instantaneously.
Figure 1-2. Typical 9140 10/100Mbps UTP/Fiber Application.
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