Local area network system

• US 4,807,961 A
• Filed: 04/08/1987
• Issued: 02/28/1989
• Est. Priority Date: 04/08/1987
• Status: Expired due to Term

• Current Assignee: AT&T Technologies Inc (Nokia Corporation), Bell Telephone Laboratories, Inc. (Nokia Corporation)
• Original Assignee: AT&T BELL LABORATORIES, AT&T TECHNOLOGIES, INC., American Telephone & Telegraph Company (AT&T, Inc.)
• Inventors: Reed, William C., Scholly, Christian, Mullin, Francis J.
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): Ullah, Akm E.
• Application Number:
  US07/035,953
• Time in Patent Office: 692 Days
• Field of Search: 350/96.16, 350/96.23, 455/610, 455/612
• US Class Current: 385/102
• CPC Class Codes: G02B 6/4401 Optical cables glass fibres with a protective coating G02B6/02395
• CPC Class Codes: G02B 6/443 Protective covering
• CPC Class Codes: G02B 6/4434 Central member to take up tensile loads
• CPC Class Codes: G02B 6/475 Mechanical aspects of installing cables in ducts or the like for buildings
• CPC Class Codes: H04H 20/69 Optical systems

Abstract

A communications distribution system (20) provides service for local business and residential premises with fewer splice points required and less waste than encountered in prior art systems. The system includes a feeder distribution interface (60) which is served by a feeder cable or by a carrier system and at least one group interface (61) which is disposed to serve customers'"'"' premises. A backbone cable segment (62) extends from the feeder distribution interface to a single group interface and is capable of providing service to a plurality of customer premises. Each customer'"'"'s premises is served by a single distribution service cable (66) which is connected to a backbone cable segment at a group interface. The single distribution service cables for an area may extend radially or laterally from a group interface.

Claims

1. A communications distribution system, which comprises:

a feeder distribution interface which is served by a feeder cable;

at least one group interface which is adapted to serve a plurality of customer premises;

a backbone cable which is adapted to provide communications service for a plurality of customer premises from said feeder distribution interface for said group interface; and

a distribution service cable which is provided for and associated with each customer premises of said plurality of customer premises, each said distribution service cable being connected at said group interface to said backbone cable and extending from said group interface to a single customer premises of said plurality of customer premises.

2. A communications distribution system for local business and residential service, said system comprising:

a feeder distribution interface which is served by a feeder cable;

at least one group interface which is disposed to serve a plurality of customer premises;

a backbone cable segment which is adapted to provide communications service for plurality of customer premises from said feeder distribution interface to a single group interface; and

a distribution service cable which is provided for and associated with each customer premises of said plurality of customer premises, each said distribution service cable being connected to said backbone cable segment at said group interface and extending to provide service to a single customer premises of said plurality of customer premises.

3. The system of claim 2, wherein a purality of distribution service cables extend radially from each said group interface.

4. The system of claim 2, wherein a plurality of distribution cables extend laterally from each said group interface.

5. The system of claim 2, wherein a plurality of backbone cable segments extend from said feeder distribution cable interface along a common path with a plurality of distribution service cables extending from each of said backbone cables at predetermined locations to serve a plurality of customer premises.

6. The system of claim 2, wherein said at least one distribution service cable includes

a core which comprises:

at least one reinforced optical fiber unit, which comprises;

at least one optical fiber;

a plurality of discrete impregnated fibrous strength members which cooperate to enclose said at least one optical fiber and being decoupled therefrom to provide tensile strength and to provide columnar strength which resists compression; and

a jacket which is made of plastic material and which encloses said strength members; and

at least one metallic conductor; and

a sheath system which encloses said at least one optical fiber unit and said at least one metallic conductor and which includes an outer plastic jacket.

7. The system of claim 6, wherein said core includes at least one twisted pair of insulated metallic conductors.

8. The system of claim 6, wherein said strength members include three impregnated fiber glass strength members each having a cross section which includes two generally parallel sides which are joined at their ends by arcuate portions, each strength member being adjacent to said optical fiber to form a triangular array and wherein said jacket touches generally the apices of the triangular array.

9. The system of claim 6, wherein said at least one optical fiber is provided with a coating of plastic material and with a buffer layer of a plastic material.

10. The system of claim 6, which also includes a waterblocking material which is disposed within said jacket of said optical fiber unit to fill interstices between said jacket of said optical fiber unit and said strength members and between the strength members and said optical fiber.

11. The system of claim 10, wherein said waterblocking material is a composition of matter which comprises about 91.4 to 94% by weight of an oil selected from the group consisting of:

(a) paraffinic oil having a minimum specific of;

of about 0.86 and a pour point less than -4°

C. and being of ASTM type 103, 104A or 104B;

(b) naphthenic oil having a minimum specific gravity of about 0.86 and a pour point less than -4°

C. and being of ASTM type 103, 104A or 104B;

(c) polybutene oil having a minimum specific gravity of about 0.83 and a pour point less than 18°

C.; and

(d) any mixture thereof.

12. The system of claim 11, wherein said composition of matter also includes about 6 to 8.5% by weight colloidal particles selected from the group consisting of hydrophobic fumed silica, hydrophilic fumed silica, precipitated silica and clay, the colloidal particles having a BET surface area in the range from about 50 to about 400 m² /g.

13. The system of claim 11, which also includes not more than about 8% by weight of a bleed inhibitor selected from the group consisting of styrene-rubber-styrene block copolymers having a styrene/rubber ratio between about 0.1 and about 0.8, semiliquid rubber having a Flory molecular weight between 20,000 and 70,000, butyl rubber, ethylene-propylene rubber, ethylene-propylene dimer rubber, chlorinated butyl rubber having a Mooney viscosity at 100°

C. between about 20 and 90, and depolymerized rubber having a viscosity at 38°

C. between about 40,000 and 400,000 cps.

14. The system of claim 10, wherein said waterblocking material is a composition of matter which comprises:

(a) about 92.8 to 83% by weight of an oil selected from the group consisting of;

i. paraffinic oil having a minimum specific gravity of about 0.86 and a pour point of less than -4°

C. and being of ASTM type 103, 104A, or 104B;

ii. naphthenic oil having a minimum specific gravity of about 0.86 and a pour point less than -4°

C. and being of ASTM type 103, 104A or 104B;

iii. polybutene oil having a minimum specific gravity of about 0.83 and a pour point of less than 18°

C.;

iv. triglyceride-based vegetable oil;

v. polypropylene oil;

vi. chlorinated paraffin oil having a chlorine content between about 30 and 75% by weight and a viscosity at 25°

C. of between 100 and 10,000 cps;

vii. polymerized esters, and

viii. any mixture thereof; and

(b) about 0.1% by weight of an antioxidant stabilizer.

15. The system of claim 14, wherein said composition also includes about 6.9 to 7.1% by weight by hydrophobic fumed silica colloidal particles.