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| A |
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| ADM |
Add/Drop Multiplexer |
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| Agent (SNMP) |
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A Software module that performs the network management functions requested by management stations. An agent module may be implemented in a network element that is to be managed, such as network element. Agents and network management stations communicate by means of SNMP. |
| AIS |
Alarm Indication Signal |
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It is a code sent to downstream sites to indicate an upstream failure (used to prevent unnecessary downstream alarms). |
| ANSI |
American National Standards Institute |
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American standards body that defines the characteristics and guidelines for telecommunications networks. |
| ATM |
Asynchronous Transfer Mode |
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| AVAR |
Allan Variance |
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| B |
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| B8ZS |
Bipolar with 8 Zero Substitution |
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Code type belonging to DS1 signal |
| BITS |
Building Integrated Timing Supply |
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Generally, this is the North American term for a SASE. |
| BPV |
BiPolar Violation |
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Two consecutives bits of the same polarity |
| BTS |
Base Transceiver Station |
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| BVA |
Boîtier Vieillissement Amelioré |
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French expression meaning "Enclosure with Improved Ageing". The OSA BVA crystal oscillators employ special techniques to achieve stability performance, unmatched by any other crystal device, i.e. typically 1 x 10-11/day. |
| C |
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| CC |
Composite Clock |
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64/8 kHz signal |
| CCITT |
International Consultative Committee on Telephone and Telegraphy |
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Old name for ITU-T |
| CE |
European Union regulatory community symbol |
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| CRC |
Cyclic Redundancy Check |
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| Cs Clock |
Cesium Clock |
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Primary reference source with a guaranteed accuracy of parts in 10E-12, using the resonance of Cesium atoms at 9.192631770 GHz |
| CTO |
Compact Tracking Oscillator |
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Level III/Local Node Clock - model OSA 5542 |
Oscilloquartz