Sonet/ATM
Terminal
Ethernet Switch
T1 / Ethernet
Corporate LAN
CO-LAN
Desktop PC
Field Tech
Ethernet
Ethernet
Serial
Typical Network Overview
HS - 251004a
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Holly Street Communications, Inc.
256 Rachael Place
Pleasanton, California 94566
www.hollystreetcomm.net
Site 1
Site 2
Sonet Ring
Point-
to-Point
Data Local Area Networks
There are two typical methods to connect remote
offices to provide data access for PC’s and Network
Elements, a SONET/ATM connection or a point-to-
point connection.
One or two Ethernet networks (LAN’s) can be found
within the remote central office/Remote Terminal:
- The Corporate LAN where the Technician’s
PC’s and printers are connected.
- The CO-LAN where the various Network
Elements are connected.
Note that the actual method of connecting the
Network Elements vary, in some cases the NE’s
are on the Corporate network.
Typically the Network Elements are isolated on
their own LAN, isolated through a router and
firewall. This is to ensure that if there is testing or
other problems, the Corporate LAN is not affected.
HS-9000
NE Access Gateway
Test Center / NOC
xDSL Terminal
Ethernet Switch
Corporate LAN
Desktop PC
Field Tech
Ethernet
Ethernet
Serial
C a m p u s - T 1
HDSL
PAIRGAIN
Site 4
Site 3
Site 5
Access
The term and function labeled “Access” means several things depending to whom
one is talking to. Many times at the NOC level, Access means there is an alarm
connection to a remote network element and when a network element has an
alarm condition that NE has access to an alarm display located in the NOC.
At the field level, Access refers to the process of physically connecting to the
Network Element and performing various activities ranging from provisioning the
device to performing maintenance on that device.
When referring to “Remote Access” this document is describing a method to
access a network element from multiple remote and local locations, to perform
activities ranging from provisioning the device, pulling performance monitoring
data to performing maintenance on that device.
Single LAN at the Remote Location
Separate LAN’s at Remote Location