Serving area interface: Difference between revisions

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The serving area interface or service area interface (SAI) is an outdoor enclosure or metal box that allows access to telecommunications wiring.

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)^[1]
Secondary cross-connection point (SCP) (UK)^[1]
Telecom cabinet

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.

References

^ ^a ^b "Multimedia Telecommunications" (BT Telecommunications Series), B. Whyte (Ed.), Springer 1997

This article related to telecommunications is a stub. You can help Wikipedia by expanding it.

[Whyte-1] "Multimedia Telecommunications" (BT Telecommunications Series), B. Whyte (Ed.), Springer 1997

[1]

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+{{refimprove|date=April 2014}}
-<gallery>
+[[File:VZ SAI workers Secaucus jeh.JPG|thumb|SAI in New Jersey]]
-Image:5400_pair_SAI.jpg|SAI containing 5400 pair splicing
+The '''serving area interface''' or '''service area interface''' ('''SAI''') is an outdoor [[Enclosure (electrical)|enclosure]] or metal box that allows access to telecommunications wiring.
-Image:1200_pair_SAI.jpg|SAI containing 1200 pair splicing
-</gallery>The '''serving area interface''' or '''service area interface''' ('''SAI''') often called '''B-box''', '''cross-connect box''', '''cross box''', or '''access point''' (AP) is an outdoor [[telecommunications]] [[cabinet]] usually mounted on the ground on cable [[easement|right-of-way]]s, but sometimes also on [[telephone pole]]s. It is here that the individual [[twisted pair]]s of a telephone [[local loop]] are [[Point of appearance|terminated]]. SAI are often recognizable as ubiquitous gray-green cabinets seen next to [[street]]s. Here the individual twisted pair wires interface with F2 ( or Secondary Feeder Cable ) pairs and connect with F1 ( or Main Feeder Cable ) pairs at this point. F1 cables then go underground in conduit or along poles, usually to the nearest [[central office]] (CO) or remote switch, or first to transmission equipment such as a [[Subscriber Loop Carrier]] multiplexer and then to the CO.
+==Alternate names==
-SAI are used in [[suburb]]an and low density urban areas, serving some of the same purposes that [[Maintenance hole|manhole]]s do in high density urban areas.  Besides a cross connect point, they sometimes contain a [[DSLAM]] or more rarely a [[remote concentrator]] or both.
+*'''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)<ref name="Whyte">"Multimedia Telecommunications" (BT Telecommunications Series), B. Whyte (Ed.), Springer 1997</ref>
+*'''Secondary cross-connection point''' ('''SCP''') (UK)<ref name="Whyte"/>
+*'''Telecom cabinet'''
-==See also==
+== Function ==
+The SAI provides the [[point of appearance|termination]] of individual [[twisted pair]]s of a telephony [[local loop]] for onward connection back to the nearest [[telephone exchange]] (US: "[[telephone exchange|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 (UK telephone cabling)|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 [[maintenance hole|manhole]]s do in high-density urban areas.  Besides a cross connect point, they sometimes contain a [[DSLAM]] or more rarely a [[remote concentrator]] or both.
+==See also==
+*[[Demarcation point]]
 *[[Enclosure (electrical)]]
-*[[Fiber to the Telecom Enclosure]]
+*[[Fiber to the telecom enclosure]]
 *[[Sub-loop unbundling]]
-*[[Telco can]]
+==References==
+{{Commons category|Serving area interface}}
+{{Reflist}}
 [[Category:Local loop]]
 [[Category:Street furniture]]
-[[de:Kabelverzweiger]]
+{{telecommunications-stub}}