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| D |
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| D-PLL |
Digital Phase Lock Loop |
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Phase lock loop technique used in the Oscilloquartz Tracking Oscillator equipment (e.g. 5540, 5542, 5544, 5546, 5548x, ...). |
| D4 |
Also called SF (Super Frame) |
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A frame type belonging to the DS1 signal |
| dB |
Abbreviation for decibel |
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| DCE |
Data Communication Equipment |
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The devices and connections of a communications network that connect the communication circuit between the data source and destination (the Data Terminal Equipment or DTE). A modem is the most common kind of DCE. |
| DDS |
Direct Digital Synthesis |
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| DS1 |
Digital Service level 1 |
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DS1 is the abbreviation for 1544 kbit/s signals |
| DTE |
Data Terminal Equipment |
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A device which acts as the source and/or destination of data and which controls the communication channel. DTE includes terminals, computers, protocol converters, and multiplexers. |
| DTO |
Dual Tracking Oscillator |
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Synchronisation system model OSA 5544 for Level II/Transit Node Clock, using 6U high 19" rack practice. |
| DTR |
Data Terminal Ready |
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The wire in a full RS-232 connection that tells the Data Communication Equipment (DCE, typically a modem) that the Data Terminal Equipment (DTE, typically a computer or terminal) is ready to transmit and receive data. |
| DXC |
Digital Cross-connect |
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| E |
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| E1 |
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E1 is simply an abbreviated form of 2048 kbit/s |
| EMC |
Electro Magnetic Compatibility |
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| EMI |
Electro Magnetic Interference |
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| EMP |
Electro Magnetic Pulse |
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The electromagnetic radiation from a nuclear explosion. The resulting electric and magnetic fields may couple with electrical/electronic systems to produce damaging current and voltage surges. |
| ESD |
ElectroStatic Discharge |
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| ESF |
Extended Super Frame |
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A frame type belonging to the DS1 signal |
| ESM |
Embedded System Manager |
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The ESM ensures effective management of OSA solutions (5548 or 5548B) by providing a gateway to Oscilloquartz' central management system, SyncView™. All functions including its powerful 486 processor, embedded software and communications interfaces are integrated into a compact plug-in module, eliminating the need for additional external hardware. |
| ETSI |
European Telecommunications Standards Institute |
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European standards body that defines the characteristics and guidelines for telecommunications networks. |
| F |
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| F3 |
Frequency, Flexibility, Functions |
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Oscilloquartz' modular equipment architecture, 19" rack standard. |
| Fault management |
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The Facilities that enable the detection, isolation, and correction of abnormal operation of the OSI environment. |
| fc |
Cut-off Frequency |
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| FCC |
Federal Communications Commission |
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| FDL |
Facilities Data Link |
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| fo |
Oscillator Output Frequency |
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| FQL |
Forced Quality Level |
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Forced Quality Level is use to set the assumed quality level of an incoming (Synchronisation) signal when the Quality level can be determined (e.g. by SSM). |
| Free Run |
Clock operating mode |
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A clock is said to be in free run mode when it has never had an external reference or is not operating from stored values acquired from a previously connected external reference. |
| FTP |
File Transfer Protocol |
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Oscilloquartz