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Introduction and Specifications
SC-IP LAN-X Applications
A Network Operations Center (NOC) can extend its LANs via one or more pairs of SC-IPs. The
SC-IPs would be configured for LAN-X mode and connected back-to-back over the WAN. This
configuration provides a NEBS-compliant extension of a Carrier's LAN so that any remote device
may be accessed from the NOC via the SC-IP.
For example, back-to-back SC-IPs can extend the LAN within a building (i.e., between floors) or,
more typically, across a WAN connection.
SC-IP units in a carrier's network. Multiple pairs of SC-IP units can be deployed to fan out the
NOC's reach to additional remote sites.
SC-IP in LAN-X mode disables the unit's IP routing function; thus, management of SC-IP is
conducted in one direction from a specified SC-IP port. While in LAN-X mode, a SC-IP port must
be specified for management.
SC-IP in LAN-X mode also supports spanning tree protocol to detect and eliminate loops and
provide data path redundancy in the in the network topology. If loops are detected, SC-IP in LAN-
X mode will block the paths that have the slowest link rate. Note that all bridges must be enabled
to derive the optimal benefit of spanning tree.
Note
The SC-IP's LAN-X and IP forwarding functions are mutually exclusive; that is, when the SC-IP is placed in
LAN-extension mode, the IP routing functions are not available.
Note
IMPORTANT: It is the responsibility of the network planner to ensure that when SC-IP is in LAN-X mode, a
loop condition must not be in effect.
NOC: IP NETWORK "A"
LAN SEGMENT "X"
NETWORK
MANAGER
LAN
ETHERNET
SC-IP
Figure 1-2
076R200-000
Issue 2
HOST
HOST
HOST
T1
SPECTRACOMM 2000
Typical Deployment of SC-IP in LAN-extension Mode
SpectraComm IP Router Card
Installation and Operation Manual
SpectraComm IP Overview
Figure 1-2
shows a typical deployment of one pair of
REMOTE OFFICE: IP NETWORK "A"
LAN SEGMENT "Y"
HOST
LAN
ETHERNET
SC-IP
T1
TERMINAL
SERVER
HOST
HOST
SPECTRACOMM 2000
MANAGED
CRAFT DEVICES
DEVICE 1
DEVICE 2
.
.
.
DEVICE 8
1-5
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