Specifications

Glossary
GL-9
Cisco ONS 15454 Installation and Operations Guide, R3.2
March 2002
Output contacts (alarms)
Triggers that drive visual or audible devices such as bells and lights. Output contacts can control other devices such as
generators, heaters, and fans.
P
Passive devices
Components that do not require external power to manipulate or react to electronic output. Passive devices include capacitors,
resisters, and coils.
Path Layer
The segment between the originating equipment and the terminating equipment. This path segment may encompass several
consecutive line segments or segments between two SONET devices.
Payload
Portion of a cell, frame, or packet that contains upper-layer information (data).
Ping
Packet internet grouper. ICMP echo message and its reply. Often used in IP networks to test the reachability of a network
device.
PPJC
positive pointer justification count
PPMN
Path Protected Mesh Network. PPMN extends the protection scheme of a unidirectional path switched ring (UPSR) beyond the
basic ring configuration to the meshed architecture of several interconnecting rings.
Priority queuing
Routing feature that divides data packets into two queues: one low-priority and one high-priority.
Provisioning user
A security level that allows the user to access only provisioning and maintenance options in CTC. See also Superuser,
Maintenance user, and Retrieve user.
Q
Queue
In routing, a backlog of packets waiting to be forwarded over a router interface.