serving area interface
The serving area interface or service area interface (SAI) is an outdoor enclosure or metal box that allows access to telecommunications wiring. • Illustration — SAI in New Jersey
Also recorded as telecoms cabinet · access point · B-box · breakout box
serving area interface
Berthold Werner · CC BY-SA 3.0
- Field
- street cabinet
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Documentary evidence
Documentary basis
Authority files
wikidata · Q1719654 · wikipedia · Serving area interface
In this article
Alternate names
Alternate names
• Access point (AP) • Cabinet (cab) • B-box (breakout box) • Cross box • Cross-connect box • Jumper wire interface (JWI) • Outside plant interface (OPI) • Pedestal (ped) • Primary cross-connection point (PCP) (UK) • Secondary cross-connection point (SCP) (UK) • Telecom cabinet
Function
Function
The SAI provides the termination of individual twisted pairs of a telephony local loop for onward connection back to the nearest telephone exchange (US: "central office" (CO)) or remote switch, or first to transmission equipment such as a subscriber loop carrier multiplexer and then to the exchange main distribution frame (MDF). In the United Kingdom, the components from the PCP onwards to the customer are known as "D-side" (distribution side), and from the PCP back to the MDF as the "E-side" (exchange side). In the United States, the connection back to the MDF is known as the F2 (secondary distribution cable) and/or the F1 (main feeder cable) pairs. SAIs are used in suburban and low-density urban areas, serving some of the same purposes that manholes do in high-density urban areas. Besides a cross connect point, they sometimes contain a DSLAM or more rarely a remote concentrator or both.
Text attribution
Licensing
Text attribution
Part of the biographical narrative on this page reuses licensed material. Its origin, revision and licence are recorded here.
The biographical narrative on this page is based on the Wikipedia article Serving area interface, revision 1340180104 (EN edition), by its contributors. VALÉORINE has edited that text and built its own documentary record around it. The reused material is available under CC BY-SA 4.0, and this page's reuse of it is offered under the same licence. Everything else on this page — the chronology, the holdings, the evidence, the plates and the connections — is VALÉORINE's own record. Sources and licences.
References
Citations
References
Each reference names the institution holding it, so a reader may go to the document itself.
reference work
Secondary witnessreference work
Secondary witness
The Encyclopedia exists whether or not anything is for sale. Corrections are recorded rather than overwritten, and every version of this record is kept. Published 14 August 2026.
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