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EMC Connectrix DS-32B2 and ED-12000B Fabric OS Reference Manual
g-19
Glossary
Terminal Serial Port The lower serial port on the CP card. Receives error messages. Can be
used to connect the CP card to a computer terminal. Has a DB-9
connector wires as a ttyS0 DTE device, and can be connected by serial
cable to a DCE device. The connector has pins two and three
swapped so that a straight-through cable can be used to connected to
a terminal. See also DB-9 Connector, DCE Port, and Modem Serial Port.
Throughput The rate of data flow achieved within a cable, link, or system. Usually
measured in bps (bits per second). See also Bandwidth.
Topology As applies to Fibre Channel, the configuration of the Fibre Channel
network and the resulting communication paths allowed. There are
three possible topologies:
• Point-to-point — A direct link between two communication ports.
• Switched fabric — Multiple N_Ports linked to a switch by
F_Ports.
• Arbitrated loop — Multiple NL_Ports connected in a loop.
Transceiver Device that converts one form of signaling to another for
transmission and reception. In fiber optics, it refers to optical and
electrical.
Transmission
Character
A 10-bit character encoded according to the rules of the 8b/10b
algorithm.
Transmission Word A group of four transmission characters.
Trap (SNMP) The message sent by an SNMP agent to inform the SNMP
management station of a critical error. See also SNMP.
Tunneling A technique for enabling two networks to communicate when the
source and destination hosts are both on the same type of network,
but are connected by a different type of network.
U
U_Port Universal port. A switch port that can operate as a G_Port, E_Port,
F_Port, or FL_Port. A port is defined as a U_Port when it is not
connected or has not yet assumed a specific function in the fabric.
UDP User Datagram Protocol. A protocol that runs on top of IP and
provides port multiplexing for upper-level protocols.