Cisco ONS 15327 User Documentation page 537

Glossary
Subnet mask
32-bit address mask used in IP to indicate the bits of an IP address that are used for the subnet address. Sometimes referred to
simply as mask. See also IP address mask and IP address.
Subnetting
A technique used to maximize the number of networks available within a range (class) of addresses. See also Subnetwork.
Subnetwork
In IP networks, a network confined to a particular subnet address. Subnetworks are networks segmented by a network
administrator in order to provide a multilevel, hierarchical routing structure while shielding the subnetwork from the addressing
complexity of attached networks. Sometimes called a subnet.
Subtending rings
SONET rings that incorporate nodes that are also part of an adjacent SONET ring.
Superuser
A security level that can perform all of the functions of the other security levels as well as set names, passwords, and security
levels for other users. A superuser is usually the network element administrator. See also Retrieve user, Maintenance user, and
Provisioning user.
Switch
Network device that filters, forwards, and floods frames based on the destination address of each frame.
T
T1
T1 transmits DS-1-formatted data at 1.544 Mbps through the telephone-switching network using AMI or B8ZS coding. See
also AMI, B8ZS, and DS-1.
Tag
Identification information, including a number plus other information.
TDM
Time Division Multiplexing. Allocates bandwidth on a single wire for information from multiple channels based on
preassigned time slots. Bandwidth is allocated to each channel regardless of whether the station has data to transmit.
Telcordia
Telcordia Technologies, Inc., formerly named Bellcore. Eighty percent of the U.S. telecommunications network depends on
software invented, developed, implemented, or maintained by Telcordia.
TID
Target Identifier. Identifies the particular network element (in this case, the ONS 15327) where each TL1 command is directed.
The TID is a unique name given to each system at installation.
Cisco ONS 15327 User Documentation, R3.3
GL-13
June 2002