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| P |
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| PCM |
Pulse Code Modulation |
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| PDH |
Plesiochronous Digital Hierarchy |
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| PDU |
Protocol Data Unit |
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A data structure containing SNMP message components and used for communication between SNMP entities. |
| ppm |
Parts per million |
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| pps |
Pulse per second |
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| PRC |
Primary Reference Clock |
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| PSTN |
Public Switched Telephone Network |
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| PSU |
Power Supply Unit |
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| Q |
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| Q3 |
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A software agent (or adapter) which provides a standard way to integrate telecommunication equipment in a TMN system. |
| QL |
Quality Level |
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Quality Level is defined by ITU-T to be one of (for SDH network):
PRC = desc. In G.811
SSU-A = desc. In G.812 (I & V)
SSU-B = desc. In G.812 (VI)
SEC = desc. In G.813
DNU = Do Not Use |
| QoS |
Quality of Service |
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| R |
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| RAM |
Remote Access Manager |
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An add-on package allowing remote use of any Oscilloquartz' Local Manager, either through modems and POTS/ISDN connections or through TCP/IP networks. |
| RAN |
Return Authorization Number |
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Also called RMA – Number required to return material for factory repair |
| Rb |
Rubidium |
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Clock oscillator using Rubidium. |
| RFC |
Request For Comment |
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The Requests for Comments (RFCs) form a series of notes, started in 1969, about the Internet (originally the ARPANET).
The notes discuss many aspects of computer communication, focusing on networking protocols, procedures, programs, and concepts but also including meeting notes, opinion, and sometimes humor. The document series edited by the Internet Engineering Task Force (IETF) describes the Internet suite of protocols and related experiments. |
| RJ-45 |
Registered Jack 45 |
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8 pin-connector for data transmission |
| RM |
Regional Manager |
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Regional management level within the SyncView™ hierarchy. |
| RMU |
Remote Management Unit |
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This module is present in 5581C and 5533C equipments. |
| RS422 |
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Specification for electrical parameters of an interface only. RS422 is compatible with V11 and X21. |
| RS449 |
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Specification for mechanical parameters of an interface together with pinout and connector gender (DTE male, DCE female). |
| RTC |
ReTiming Card |
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| RTU |
Re-Timing Unit |
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A plug-in module that re-times traffic signals (i.e. E1/T1 signals) affected by excessive jitter and wander. An RTU physically fits into an OIU slot and needs specifically designed connector tiles. |
Oscilloquartz