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edge switch 2/16 service manual Glossary–45
Glossary
SFP transceivers
See small form factor pluggable transceivers.
shortwave
Lasers or light-emitting diodes (LEDs) that emit light with wavelengths around 780 nm or 850
nm. When using multimode fiber (50 nm) shortwave lasers can be used with Fibre Channel
links less than 500 m. To achieve longer lengths, single-mode fiber is required. The preferred
fiber core size is 50 micron as this fiber has large bandwidth so that the distance is limited by
the fiber attenuation. A 62.5 micron core size is also supported for compatibility with existing
FDDI installations. Fiber of this type has smaller bandwidth and, in this case, the distance is
limited by the fiber bandwidth.
simple mail transfer protocol
SMTP. A transmission control protocol/Internet protocol (TCP/IP) protocol that allows the
user to create, send, and receive text messages. SMTP protocols specify how messages are
passed across a link from one system to another. They do not specify how the mail application
accepts, presents, or stores the mail.
simple network management protocol
SNMP. A transmission control protocol/Internet protocol (TCP/IP)-derived protocol
governing network management and monitoring of network devices.
simple network management protocol community
SNMP community. Also known as SNMP community string. SNMP community is a cluster of
managed products (in SNMP terminology, hosts) to which the server or managed product
running the SNMP agent belongs.
simple network management protocol community name
SNMP community name. The name assigned to a given SNMP community. Queries from an
SNMP management station to a device running an SNMP agent will only elicit a response if
those queries are addressed with the correct SNMP community name.
simple network management protocol management station
SNMP management station. An SNMP workstation personal computer (PC) used to oversee
the SNMP network.
simple network management protocol version 1
SNMP v1. The original standard for SNMP is now referred to as SNMP v1. The Sphereon
3216 and Sphereon 3232 use SNMP v1.
simple network management protocol version 2
SNMP v2. The second version of the SNMP standard. This version expands the functionality
of SNMP and broadens its ability to include OSI-based, as well as TCP/IP-based, networks as
specified in RFC 1441 through 1452.