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2 IQ Probe User Manual 61200214L1-1
Chapter 1. Introduction
information rates (CIRs), and excess burst rates on each PVC
• True non-intrusive, in-band transmission of statistics
• Embedded SNMP and TELNET through the DTE, DCE, or
SLIP/PPP port
• Embedded SNMP and TELNET access available through the
integrated 10baseT ethernet port
• Control port provides SLIP and async PPP access to SNMP or
VT 100 terminal configuration
• Dial backup (DBU) available with ESP DBU cards; options
include 4-wire Switched 56 (SW56), V.34, ISDN, and external
DCE card
• End-to-end network round trip delay measurements for
network optimization
• Frame IQ MIB is standard ASN.1 format compatible with
popular enterprise reporting systems
• Optional IQ View™ software system provides a cost-effective,
easy-to-use GUI (graphical user interface) for performance
management
• DTE (data terminal equipment) and DCE (data communica-
tions equipment) interfaces support interface standards of
EIA-232, V.35, X.21, and EIA-530
UNDERSTANDING FRAME RELAY
Frame relay is a wide area network (WAN) service designed to
minimize physical connections. This is accomplished by using
virtual connections within the frame relay cloud and accessing
these virtual circuits with normally one physical connection at
each location to the frame relay service. Virtual circuits are
addressed using header information at the beginning of each
frame. These frames are formatted by a device such as a router
or FRAD (frame relay access device) and monitored by the IQ
Probe.
ANSI (American National Standards Institute) standards de-
scribe how each frame must be constructed to provide interoper-
ability between CPE equipment and frame relay switching
equipment. Each frame must contain a header, at least one byte
of information data, two bytes of CRC16, and a trailing flag
0x7E.