User guide

Glossary 465
Local Port
The physical connection through which a DSR switch or CPS appliance can be accessed without
accessing a network connection.
For a DSR switch, the local port is typically the KVM connection at which a keyboard, mouse and
monitor can be connected directly to the DSR switch. An onscreen display may be invoked to
control the DSR switch and access switched KVM ports.
For a CPS appliance, the local port is typically the serial connection at which a terminal can be
connected directly to the CPS appliance. A command line interface (CLI) is used to control the
CPS appliance and access switched serial ports.
Lightweight Directory Access Protocol (LDAP)
A set of protocols for accessing information directories. LDAP is based on standards contained in
the X.500 standard, but is significantly simpler. Unlike X.500, LDAP supports TCP/IP, which is
necessary for Internet access. Because LDAP is a simpler version of X.500, it is sometimes called
X.500-lite.
Managed Appliance
Managed appliances include DSR switches, CPS appliances, EVR1500 environmental monitor and
control appliances and generic appliances (such as routers).
Management Information Base (MIB)
A database of objects that can be monitored by a network management system (NMS). SNMP uses
standardized MIB formats that allow any SNMP tools to monitor any device defined by an MIB.
Network Address Translation (NAT)
An Internet standard that enables a local-area network (LAN) to use one set of IP addresses for
internal traffic and a second set of addresses for external traffic. A NAT box located between the
LAN and Internet makes all necessary IP address translations.
NAT serves three main purposes:
• Provides a type of firewall by hiding internal IP addresses.
• Enables a company to use more internal IP addresses. Since they're used internally only, there's
no possibility of conflict with IP addresses used by other companies and organizations.
• Allows a company to combine multiple ISDN connections into a single Internet connection.
NAT Device
A network address translation (NAT) device enables the use of more internal IP addresses than the
number that are assigned. A NAT device provides IP addresses that are not exposed outside of the
device. The DSView software will not support network configuration where the DSView Server
and CPS appliances or DSR switches are separated by a NAT device.