TeleCom Glossary

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Glossary: R
RACF Resource Access Control Facility
RAI Remote Alarm Indication
RAI-CI Remote Alarm Indication–Customer Installation
Random access memory (RAM) A solid-state memory device used for transient memory storage. Allows you to enter and retrieve information from any storage position.
RAS Remote Access Server
RAU See Relay Access Unit.
RBOC Regional Bell Operating Company
RCA See Root Cause Analysis.
RDBMS See Relational Database Management System.
RDL Remote Digital Loop
RDLI Remote Digital Loop Intermediate
RDT Remote Digital Terminal
RDTA Remote Digital Test Access
Read-only memory (ROM) A solid-state memory device which has information permanently written into the memory during manufacture.
Real time A transmission or data processing operating mode by which data is entered in an interactive session; pertaining to an application whereby response to input is fast enough to affect subsequent input such as a process-control system; describing processing in which the results are used to influence an ongoing process.
Red alarm A red alarm is caused by a locally detected facility failure. A red alarm sends a remote alarm back towards the transmit end of the circuit.
Relational Database Management System (RDBMS) A structured computer information storage and retrieval system where the basic unit is a Table with Rows and Columns (See Relation). Data is defined accessed and modified with SQL statements.
Relay Access Unit (RAU) This unit performs metallic circuit accesses in DTAU or Mini-DTAU.
Remote alarm An alarm received at the transmit end of the circuit to indicate that a failure has occurred in the receive direction (formerly yellow alarm).
Resynchronization (framing) A signal correction performed because two frame synchronization errors were detected. These errors were in four consecutive frame synchronization bits and there was no frame slip. As a result the signal is reframed and the pattern is resynchronized.
Resynchronization (pattern) A signal correction performed due to a disruptive or out-of-service test with a known pattern more than 307 bit errors occurred in a 10-ms interval. (This rate corresponds to a 1- in-50 error rate.) When this happens pattern synchronization loss occurs and both the framing and the pattern are resynchronized.
Ringing The process of alerting the called party by the application of an intermittent ac signal (typically 20 Hz) to the appropriate line. When you apply the ringing signal to the called line you send an audible ringback tone to the calling telephone to show that ringing is occurring.
RIP Routing Information Protocol
RISC Reduced Instruction Set Computer
RML Remote Maintenance Loopback
RMR Retransmitted Message Ratio
Root Cause Analysis (RCA) A Telcordia standard for Telecommunications Management Network (TMN) architectures. The objective of RCA is to reduce the amount of analysis time spent determining why multiple alarms occur. It is expected that network management of a large-scale data network may receive up to 700 alarm messages per second during peak operating periods. To handle this level of alarm traffic RCA automatically processes certain alarm messages in predetermined ways one of them being automatic generation of a trouble ticket for the root cause of a problem that generated multiple alarm messages.
Router A sophisticated protocol-sensitive device that examines data packets and finds the best route for them between sender and receiver. Selects the cheapest fastest or least busy of all available routes. Routers operate at Layer 3 of the OSI reference model and forward information based on Layer 3 addresses which have networkwide significance. For example Internet routers forward datagrams based on the IP address of the destination host (cf. bridges which operate at Layer 2).
RSA Repair Service Attendant
RTOS Real-time Operating System
RTP Remote Test Port
RTPP Remote Test Port Panel
RTS-5A Remote Test System 5A
 

 

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