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Serial Line Internet Protocol. A standard protocols for point-to-point serial connections using a
SLIP
variation of TCP/IP. This protocol is the predecessor of PPP. See PPP and TCP.
A numbered location within a chassis, which is capable of housing a card or module.
slot
single-mode fiber. Fiber-optic cabling with a narrow core that allows light to enter only at a single
SMF
angle. Such cabling has higher bandwidth than multimode fiber, but requires a light source with a
narrow spectral width (for example, a laser). See also MMF.
Simple Network Management Protocol. The network management protocol of choice for
SNMP
TCP/IP-based internets. SNMP provides a means to monitor and control network devices, and to
manage configurations, statistics collection, performance, and security.
signal-to-noise ratio. The usable signal being transmitted divided by the noise or undesired signal.
SNR
SNR is a measure of transmission quality.
Synchronous Optical Network. A standard format for transporting a wide range of digital
SONET
communications services over optical fiber. SONET is characterized by standard line rates, optical
interfaces, and signal formats.
Address of a network device that sends data. See also destination address.
source address
A method of connecting devices in which end points on a network are connected to a common central
star topology
switch by point-to-point links. Compare with bus topology, daisy-chain topology, ring topology, and
tree topology.
Synchronous Transfer Module 1. Synchronous Digital Hierarchy standard for transmission over
STM-1
OC-3c optical fiber at 155.52 Mbps.
Synchronous Transport Signal level 3, concatenated. SONET format that specifies the frame structure
STS-3c
for the 155.52 Mbps-lines used to carry ATM cells. See also SONET.
See xTU-C.
STU-C
See xTU-R.
STU-R
One of a number of virtual interfaces on a single physical interface.
subinterface
For routing purposes, IP networks can be divided into logical subnets by means of a subnet mask.
subnet
Values below those of the mask are valid addresses on the subnet.
Portion of an IP address that is specified as the subnetwork by the subnet mask.
subnet address
The 32-bit address mask used in IP to indicate the bits of an IP address that are being used for the
subnet mask
subnet address.
The process by which a DSLAM node automatically searches through the interfaces and ports within
subrack discovery
that DSLAM and discovers the components that are present within that DSLAM.
A logical entity with attributes identifying the customer that is receiving service on a particular port.
subscriber
Services and aggregates the data from one or more chassis into a subtending host chassis requiring
subtended
configuration
only one connection to the outside network. This reduces the number of ATM edge-switch ports
necessary to terminate multiple chassis.
OL-2365-02
Cisco 6260 Hardware Installation Guide
Glossary
GL-25
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