Troubleshooting guide

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Abbreviations used in the manual
AC Alternating Current
ACK ACKnowledge
ADSL Asymmetric Digital Subscriber Line
ALG Application Level Gateway
ANSI American National Standards Institute
ARP Address Resolution Protocol
AS Autonomous System
AUX Auxiliary
BCU Basic Control Unit
BGP Border Gateway Protocol
BGP4 Border Gateway Protocol - version 4
BGP4+ Multiprotocol Extensions for Border Gateway Protocol - version 4
bit/s bits per second (can also appear as bps)
BPDU Bridge Protocol Data Unit
BRI Basic Rate Interface
BSU Basic Switching Unit
CC Continuity Check
CDP Cisco Discovery Protocol
CFM Connectivity Fault Management
CIDR Classless Inter-Domain Routing
CIR Committed Information Rate
CIST Common and Internal Spanning Tree
CLNP ConnectionLess Network Protocol
CLNS ConnectionLess Network System
CONS Connection Oriented Network System
CRC Cyclic Redundancy Check
CSMA/CD Carrier Sense Multiple Access with Collision Detection
CSNP Complete Sequence Numbers PDU
CST Common Spanning Tree
CSU Control and Switching Unit
DA Destination Address
DC Direct Current
DCE Data Circuit terminating Equipment
DHCP Dynamic Host Configuration Protocol
DIS Draft International Standard/Designated Intermediate System
DNS Domain Name System
DR Designated Router
DSAP Destination Service Access Point
DSCP Differentiated Services Code Point
DTE Data Terminal Equipment
DVMRP Distance Vector Multicast Routing Protocol
E-Mail Electronic Mail
EAP Extensible Authentication Protocol
EAPOL EAP Over LAN
EFM Ethernet in the First Mile
ES End System
FAN Fan Unit
FCS Frame Check Sequence
FDB Filtering DataBase
FQDN Fully Qualified Domain Name
FTTH Fiber To The Home
GBIC GigaBit Interface Converter
GSRP Gigabit Switch Redundancy Protocol
HMAC Keyed-Hashing for Message Authentication
IANA Internet Assigned Numbers Authority
ICMP Internet Control Message Protocol
ICMPv6 Internet Control Message Protocol version 6
ID Identifier
IEC International Electrotechnical Commission
IEEE Institute of Electrical and Electronics Engineers, Inc.
IETF the Internet Engineering Task Force
IGMP Internet Group Management Protocol
IP Internet Protocol
IPCP IP Control Protocol
IPv4 Internet Protocol version 4