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| S |
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| SASE |
Stand-alone Synchronisation Equipment |
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OSA model 5548 or 5548B synchronisation system for SONET/SDH or PDH, Transit or Local Node Clock. |
| SCI |
Standard Control Interface |
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SCI is the standard software embedded in the Oscilloquartz SSU MAC processor card. |
| SDA |
Synchronisation Data Acquisition |
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Oscilloquartz' data acquisition software utility for use with TTS, T/O, CTO, DTO & SSU. Normally incorporated in SDR & SMA (see below). |
| SDH |
Synchronous Digital Hierarchy |
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| SDR |
Synchronisation Data Reduction |
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Oscilloquartz' post processing software designed for use with OSA Tracking Oscillators or TIE Test Sets for analysis of timing signals with respect to ITU-T (CCITT) and other parameters (e.g. TIE, MTIE, AVAR, TVAR). |
| SDU |
Synchronisation Distribution Unit |
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| SEC |
Synchronous (SDH) Equipment Clock |
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| SGC |
Signal Generator Card |
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| SMA |
Software Management |
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Oscilloquartz craft terminal utility for local control and maintenance of CTO, DTO, SSU or other equipment fitted with MAC. |
| SMC |
SONET Minimum Clock |
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| SNMP |
Simple Network Management Protocol |
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The application protocol offering network management service in the Internet suite of protocols. Abbreviation used for both SNMP v1 and SNMP v2. |
| SONET |
Synchronous Optical Network |
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| SQL |
Structured Query Language |
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A standard interactive and programming language for getting information from and updating a database. Queries take the form of a command language that lets the user select, insert, update, find out the location of data, and so forth. |
| SSM |
Synchronisation Status Message |
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| SSMB |
Synchronisation Status Message Byte |
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| SSU |
Synchronisation Supply Unit or Synchronisation Source Utility |
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| ST2 |
Stratum 2 clock |
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| ST3 |
Stratum 3 clock |
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| ST3E |
Stratum 3E clock |
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| STM-N |
Synchronous Transport Module of level N |
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| STS |
Synchronisation Test Set |
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High-resolution phase/frequency measurement equipment for analysis of timing signals with respect to ITU-T and other parameters (e.g. TIE, MTIE, AVAR, TVAR). |
| SyncView™ |
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Oscilloquartz’ network management system (NMS). SyncView™ offers considerable savings by rationalising operation and maintenance tasks. It manages the Oscilloquartz synchronisation network from a single point and optionally enables control at regional level. |
| T |
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| T1 |
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T1 is simply an abbreviated form of 1544 kbit/s |
| tau or t |
Loop Time Constant |
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t is the TOM loop time constant which can be programmed by the user to a value between 100 and 100,000 seconds. Appropriate setting of t optimises TOM's jitter and wander filtering characteristics. |
| TCP / IP |
Transmission Control Protocol / Internet Protocol |
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| TCU |
Timecode Unit |
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The NTP (Network Time Protocol) provides a standard timing protocol for computer systems (e.g. any IP-based networks). Time synchronisation is important for the accuracy of system logs and for correct time stamps on files that may be accessed by more than one computer via NFS (Network File System). The NTP server implemented in this module provides a GPS-derived time reference to all system clocks on individual machines in the associated network. |
| TDEV |
Time Deviation |
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Square root of TVAR, expressed in nano seconds. |
| TEX-P |
Passive Time Extraction |
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Passive in-line device normally mounted external to the equipment, used to couple 64 or 1544 or 2048 kbit/s links to the equipment. |
| THC |
Tracking & Holdover Card |
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| TIE |
Time Interval Error |
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Variation in time delay of a given timing signal with respect to an ideal timing signals over a particular time period. Time interval error over an observation time S (seconds). |
| TL1 |
Transaction Language 1 |
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TL1 was defined in the 80's by Bellcore (now Telcordia) and is the dominant management protocol for controlling telecommunications networks in North America, China and other parts of the world. |
| TMN |
Telecommunications Management Network |
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| TNC |
Transit Node traCeable |
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| TOM |
Tracking Oscillator Module |
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TOM and its associated VCO (e.g. OCXO or BVA) form the core of OSA's synchronisation solutions. TOM phase locks the VCO to the selected input, effectively filtering and regenerating the timing signal. This combination also provides highly stable outputs in holdover mode. |
| TS0 |
Time Slot 0 (Zero) |
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| TU-12 |
Tributary Unit 12 |
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| TVAR |
Time Variance |
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Measure of the expected time variation of signal as a function of integration time. See also TDEV. |
| U |
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| UL |
Underwriter’s Laboratories, Inc |
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Oscilloquartz