JPH01238392A - Catv distributing system - Google Patents
Catv distributing systemInfo
- Publication number
- JPH01238392A JPH01238392A JP63065472A JP6547288A JPH01238392A JP H01238392 A JPH01238392 A JP H01238392A JP 63065472 A JP63065472 A JP 63065472A JP 6547288 A JP6547288 A JP 6547288A JP H01238392 A JPH01238392 A JP H01238392A
- Authority
- JP
- Japan
- Prior art keywords
- catv
- subscriber
- equipment
- line
- station
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000013307 optical fiber Substances 0.000 claims abstract description 14
- 238000000926 separation method Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 29
- 238000010586 diagram Methods 0.000 description 4
- 230000008054 signal transmission Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔概 要〕
広帯域交換システムを利用したCATV分配方式に関し
・
広帯域交換システムの遠隔装置と加入者との間の伝送路
をCATVのテレビ信号伝送に兼用し、CATVシステ
ムを低コストで提供することを目的とし、交換を行なう
局と集線/分離を行なう複数の遠隔装置をタイムスロッ
ト方式の光ファイバで結び、各遠隔装置に各加入者をタ
イムスロット方式の光ファイバで結んだ広帯域交換シス
テムを用い、複数チャネルのCATV信号をセンタより
前記遠隔装置の各々へ伝送し、遠隔装置では加入者が要
求したチャネルのCATV信号を、テレビ電話などに使
用していないタイムスロットの1つにのせて該加入者へ
送るよう構成する。[Detailed Description of the Invention] [Summary] Regarding a CATV distribution system using a broadband switching system - The transmission path between the remote device of the broadband switching system and the subscriber is also used for CATV television signal transmission, and the CATV system is Aiming at low cost, it connects the exchange center and multiple remote devices concentrating/separating lines using time-slotted optical fibers, and connects each subscriber to each remote device using time-slotted optical fibers. Using a broadband switching system, multiple channels of CATV signals are transmitted from the center to each of the remote devices, and the remote devices transmit the CATV signals of the channel requested by the subscriber to one of the time slots not used for videophone calls, etc. The system is configured to send the information to the subscriber on the same basis.
本発明は、広帯域交換システムを利用したCATV分配
方式に関する。The present invention relates to a CATV distribution system using a broadband switching system.
CATVはセンタと加入者宅を伝送路で結び、各種テレ
ビ番組をセンタより各加入者宅へ伝送する。CATV connects a center and subscriber's homes through transmission lines, and transmits various television programs from the center to each subscriber's home.
また、回線交換設備は局(交換機)を介して加入者宅を
伝送路で結び、交換機で接続した加入者宅相互で通話さ
せる。In addition, circuit switching equipment connects subscriber's homes via a transmission line through a central office (exchange), and allows the subscriber's homes connected through the exchange to communicate with each other.
テレビ電話とCATVを加入者宅に付設するには、テレ
ビ電話用とCATV用の各伝送路を加入者宅へ引く必要
があるが、共用できれば伝送路は1つで済む。本発明は
広帯域回線交換システムを利用してCATVを伝送し、
伝送路を1つで済ます方式に係るものである。In order to install a videophone and CATV at a subscriber's home, it is necessary to run transmission lines for the videophone and CATV to the subscriber's home, but if they can be shared, only one transmission line is required. The present invention transmits CATV using a broadband circuit switching system,
This relates to a method that requires only one transmission path.
第4図にcaTVt、tilの構成例を示す。10はセ
ンタ設備で、UHF/VHF受信設備10a、衛星受信
設備10b、製作スタジオIQc、および送出設備10
dを備える。12は伝送設備で、信号伝送線12a1中
継増幅器12b1タップオフ12Cを備え、そして14
は加入者設備で、テレビ受像機14aなどを備える。セ
ンタ設備と各加入者を結ぶ伝送路の形態には第4図中)
に示す樹枝状、同図(C)に示すスター状などがある。FIG. 4 shows an example of the configuration of caTVt and til. 10 is center equipment, which includes UHF/VHF reception equipment 10a, satellite reception equipment 10b, production studio IQc, and transmission equipment 10.
d. 12 is a transmission equipment, which includes a signal transmission line 12a1, a relay amplifier 12b1, and a tap-off 12C;
is subscriber equipment, which includes a television receiver 14a and the like. The configuration of the transmission line connecting the center equipment and each subscriber is shown in Figure 4).
There is a dendritic shape shown in the figure, a star shape shown in the same figure (C), etc.
がCATV網には(blの樹枝状が広く使われている。However, the dendritic form of (bl) is widely used in CATV networks.
CATVシステムの伝送信号は現在はアナログ信号が主
流であり、またセンタから供給される番組チャネル数は
100チヤネルにも及ぶ。ディジタル化、伝送路の光フ
アイバ化などの傾向に従って従来の同軸ケーブル使用ア
ナログCATVを光ディジタルCATV化することが考
えられるが、番組チャネル当り150 Mbpsの伝送
路を必要とするから、第4図(blの樹枝状、第4図(
C1のスター状とも、大容量の伝送路(150MX 1
00ch)を加入者宅まで設備する必要があり、コスト
がか\る。Currently, analog signals are the mainstream for CATV system transmission signals, and the number of program channels supplied from the center reaches 100 channels. In line with trends such as digitization and optical fiber transmission lines, it is conceivable to convert conventional analog CATV using coaxial cables to optical digital CATV, but since it requires a transmission line of 150 Mbps per program channel, Dendritic shape of bl, Fig. 4 (
Both the star shape of C1 and the large capacity transmission line (150MX 1
00ch) must be installed at the subscriber's home, which increases costs.
一方、電話交換システムでも、加入者宅まで光フアイバ
化する広帯域交換システムが検討されている。その−例
を第5図に示す。Lは光ケーブルで構成される加入者幹
線ループ、COは交換を行なう局、REは集線・分離を
行なう遠隔装置、14A、14B、・・・・・・はテレ
ビ電話端末などである。On the other hand, in the telephone switching system as well, a broadband switching system that uses optical fibers to connect to subscriber's homes is being considered. An example thereof is shown in FIG. L is a subscriber trunk loop composed of optical cables, CO is a station for switching, RE is a remote device for concentrating and separating lines, and 14A, 14B, . . . are video telephone terminals, etc.
加入者端末と遠隔装置を結ぶ加入者分配伝送路!も60
0Mbpsの光ファイバで、これが遠隔装置REで集線
/分離され、タイムスロット方式の2゜4Gbpsの加
入者幹線ループLに接続する。遠隔装置REは集線/分
離段S I、 S 2、信号処理装置SGU、呼処理
装置CPUを備え、局coは交換機SW、呼処理装置C
PUを備える。Subscriber distribution transmission line connecting subscriber terminals and remote equipment! Also 60
A 0 Mbps optical fiber is condensed/separated at a remote device RE and connected to a time-slotted 2°4 Gbps subscriber trunk loop L. The remote equipment RE includes concentrator/separation stages SI and S2, a signal processing unit SGU, and a call processing unit CPU, and the office CO includes an exchange SW and a call processing unit C.
Equipped with PU.
加入者宅まで光フアイバ化した広帯域交換システムでは
、電話をテレビ電話にしてもまだ伝送容量に余裕がある
。In a broadband switching system that uses optical fiber to reach subscribers' homes, there is still plenty of transmission capacity even if telephone calls are replaced by video calls.
それ数本発明は、広帯域交換システムの遠隔装置と加入
者端末との間の伝送路をCATVのテレビ信号伝送に兼
用し、CATVシステムを低コストで提供することを目
的とするものである。It is an object of the present invention to provide a CATV system at low cost by using a transmission line between a remote device of a broadband switching system and a subscriber terminal for CATV television signal transmission.
第1図に示すように本発明では遠隔装置REにCATV
の信号20をセンタ設備より送り、この遠隔装置より各
加入者端末14A、14B、・・・・・・へ、要求され
たチャネルの信号を送る。As shown in FIG. 1, in the present invention, the remote device RE is connected to a CATV
A signal 20 of the requested channel is sent from the center equipment, and a signal of the requested channel is sent from this remote device to each subscriber terminal 14A, 14B, .
この遠隔装置REは加入者側mチャネル、加入者幹線ル
ープL(lIInチャネルの集線/分離を行なう。Sは
そのための空間スイッチ、Tはタイムスイッチである。This remote equipment RE concentrates/separates the m channels on the subscriber side and the subscriber trunk loop L (lIIn channels. S is a space switch therefor, and T is a time switch.
光ファイバ、タイムスロット方式の加入者分配伝送路l
の伝送容量は本例では600Mbpsで、テレビ電話の
情報伝送には150Mbpsあればよいから、各加入者
分配伝送路は4チヤネル分の伝送容量を持つ。従って第
1チヤネルはテレビ電話に、第2チヤネルはパソコン、
ファックスなどのデジタル端末に、第3.第4チヤネル
はCATVの各チャネル(2チヤネル)に等と割当るこ
とができる。Optical fiber, time slot type subscriber distribution transmission line
In this example, the transmission capacity of is 600 Mbps, and since 150 Mbps is sufficient for videophone information transmission, each subscriber distribution transmission line has a transmission capacity of 4 channels. Therefore, the first channel is for videophone, the second channel is for PC,
A third option is attached to a digital terminal such as a fax machine. The fourth channel can be assigned to each CATV channel (2 channels), etc.
遠隔装置REヘセンタから送られるCATVの情報は本
例では30チヤネルあるとしており、加入者端末から指
定されたチャネルのCATV信号を該加入者端末へ空間
スイッチSおよびタイムスイッチTを介して送る。テレ
ビ電話では1加入者端末と1加入者端末を接続する、つ
まり1対l接続をするが、CATVでは同じチャネルを
複数の加入者が要求することもあるから1対n接続にな
る。遠隔装置REでは、この電話に対する1対1接続と
、CATVに対する1対n接続を行なう。In this example, the CATV information sent from the remote device REHecenter is assumed to have 30 channels, and the CATV signal of the specified channel is sent from the subscriber terminal to the subscriber terminal via the space switch S and the time switch T. In videophone, one subscriber terminal is connected to one subscriber terminal, that is, a one-to-l connection is made, but in CATV, since multiple subscribers may request the same channel, it is a one-to-n connection. The remote device RE makes a one-to-one connection to this telephone and a one-to-n connection to the CATV.
この構成であれば、各加入者は図示しないテレビ電話端
末またはテレビ受像機に設けられている入力装置を操作
して、CATV情報の送出要求およびどのチャネル(番
組)を希望するかの情報を遠隔装置REへ送ると、遠隔
装置では希望のチャネルの情報を当該加入者端末へその
CATV用チャネルにのせて送出する。図示の例では加
入者端末14Aは#lチャネルを要求し、加入者端末1
4Jは#3チャネルを要求したので、本例では第3チヤ
ネルである加入者CATV情報用チャネルに該#1.#
3チャネルのCATV情報をのせて伝送している。With this configuration, each subscriber can remotely request transmission of CATV information and information on which channel (program) he/she desires by operating a videophone terminal (not shown) or an input device provided on the television receiver. When the information is sent to the device RE, the remote device sends information on the desired channel to the subscriber terminal on the CATV channel. In the illustrated example, subscriber terminal 14A requests the #l channel and subscriber terminal 1
Since 4J requested channel #3, in this example, channel #1 is sent to the subscriber CATV information channel, which is the third channel. #
It transmits 3 channels of CATV information.
各加入者は本例では2つのチャネル(番組)まで要求す
ることができ、テレビ電話やデジタル端末とは独立に、
2種のCATV放送を同時に視聴することができる。加
入者分配伝送路lの伝送容量いわば余りを利用してCA
TV放送するので、電話とは異なる料金体系とすること
も可能である。勿論CATV用にテレビ電話とは独立に
伝送線を各加入者宅へ張る必要はなく、低コストのCA
TV放送設備の構築が可能になる。Each subscriber can request up to two channels (programs) in this example, independent of videophones and digital terminals.
You can watch two types of CATV broadcasts at the same time. CA by using the surplus transmission capacity of the subscriber distribution transmission line l.
Since it is broadcast on TV, it is possible to use a different fee structure from that for telephone calls. Of course, there is no need to run a transmission line to each subscriber's home independently of the videophone for CATV, and it is possible to use low-cost CATV.
It becomes possible to construct TV broadcasting equipment.
第2図、第3図に本発明の第1.第2の実施例を示す。 2 and 3 show the first embodiment of the present invention. A second example is shown.
全部を通してそうであるが、同じ部分には同じ符号が付
しである。交換を行なう局COではCATVセンタ10
からCATV番組ソースの供給を受け、加入者幹線ルー
プLのスロットにのせて遠隔装置REへ伝送する。遠隔
装置REでは、テレビ電話については局COから自装置
へのチャネル部分だけ加入者幹線ループLよりドロップ
し、CATVについては全チャネル(本例では30チヤ
ネル)を自装置へ取込むと共にそれを他装置へ向けて送
出する。CATV信号の加入者端末14A、14B。As is the case throughout, the same parts are given the same reference numerals. The station CO that performs the exchange is the CATV center 10.
It receives a CATV program source from the subscriber trunk loop L and transmits it to the remote equipment RE in a slot of the subscriber trunk loop L. The remote device RE drops only the channel portion from the station CO to its own device for videophone calls from the subscriber trunk loop L, and for CATV it takes in all channels (30 channels in this example) to its own device and transfers them to other devices. Send it towards the device. CATV signal subscriber terminals 14A, 14B.
・・・・・・への送出は、加入者からの要求により行な
う。. . . is performed in response to a request from a subscriber.
この要求は信号処理装置SGUで受け、該要求に従って
集線/分離段31.32のマルチ分配パスの切替えが行
なわれる。局CO1遠隔装置RE間のCATV情報の伝
送は、加入者幹線ループLとは別の光ファイバによって
行なってもよい。This request is received by the signal processing unit SGU, and the multi-distribution paths of the concentrator/separator stages 31 and 32 are switched in accordance with the request. The transmission of CATV information between stations CO1 and remote equipment RE may take place by means of optical fibers separate from the subscriber trunk loop L.
第2図では局COと複数の遠隔装置REを結ぶ加入者幹
線ループLはループであるが、これはスター状であって
もよく、第3図にこのスター状の例を示す。なおタイム
スロット方式のループ配線は、物理的にはループでも、
論理的にはスター状である。スター状の場合、各遠隔装
置RE相互を結ぶ方が距離が短くなることがある。この
場合CATV用の光ファイバLaを図示のように、局C
oは通さずに、遠隔装置RE同志を結ぶようにするとよ
い。各遠隔装置ではCATV用伝送線伝送線La岐器3
0で全チャネルを分岐し、当該加入者からの要求により
、指定されたチャネルのCATV情報を集線/分離段を
介して送出する。In FIG. 2, the subscriber trunk loop L connecting the station CO and the remote equipment RE is a loop, but it may also be in the form of a star, an example of which is shown in FIG. Note that time slot method loop wiring is physically a loop, but
Logically, it is star-shaped. In the case of a star shape, the distance between the remote devices REs may be shorter. In this case, the CATV optical fiber La is connected to the station C as shown in the figure.
It is preferable to connect the remote devices RE without passing it through. At each remote device, CATV transmission line La brancher 3
All channels are branched at 0, and upon request from the subscriber, CATV information of the designated channel is sent out via the concentrator/separator stage.
以上説明したことから明らかなように本発明では、広帯
域交換システムの加入者、遠隔装置間加入者線を利用し
てCATV情報を送るので、デジタル回線系サービスと
デジタル回線系サービスを同じ加入者分配伝送路で行な
うことができ、設備の低コスト化を図ることができる。As is clear from the above explanation, in the present invention, since CATV information is sent using subscriber lines between subscribers of a broadband switching system and remote devices, digital line-based services and digital line-based services are distributed to the same subscriber. This can be done through a transmission line, and the cost of equipment can be reduced.
また遠隔装置まではセンタから全ソース番組が送られて
きているので、加入者のCATVチャネルの選択も従来
と同等に可能である。In addition, since all source programs are sent from the center to remote devices, subscribers can select CATV channels in the same way as before.
第1図は本発明の原理説明図、
第2図および第3図は本発明の第1.第2の実施例を示
す説明図、
第4図は従来のCATVシステムの説明図、第5図は広
帯域交換システムの説明図である。
第1図、第2図で10はセンタ、14A、14B、・・
・・・・は加入者、COは交換を行なう局、REは集線
/分離を行なう遠隔装置、Lは局と遠隔装置を結ぶ光フ
ァイバ、lは加入者端末と遠隔装置を結ぶ光ファイバで
ある。FIG. 1 is a diagram explaining the principle of the present invention, and FIGS. 2 and 3 are diagrams explaining the principle of the present invention. FIG. 4 is an explanatory diagram of a conventional CATV system, and FIG. 5 is an explanatory diagram of a broadband switching system. In Figures 1 and 2, 10 is the center, 14A, 14B, etc.
. . . is the subscriber, CO is the station that performs the exchange, RE is the remote device that performs line concentration/separation, L is the optical fiber that connects the station and the remote device, and l is the optical fiber that connects the subscriber terminal and the remote device. .
Claims (1)
の遠隔装置(RE)をタイムスロット方式の光ファイバ
(L)で結び、各遠隔装置に各加入者(14A、14B
、・・・・・・)をタイムスロット方式の光ファイバ(
l)で結んだ広帯域交換システムを用い、 複数チャネルのCATV信号をセンタより前記遠隔装置
の各々へ伝送し、遠隔装置では加入者が要求したチャネ
ルのCATV信号を、テレビ電話などに使用していない
タイムスロットの1つにのせて該加入者へ送ることを特
徴とするCATV分配方式。[Claims] 1. A central office (CO) that performs switching and a plurality of remote equipment (RE) that performs line concentration/separation are connected by a time slot type optical fiber (L), and each remote equipment is connected to each subscriber (14A). , 14B
,...) to a time slot type optical fiber (
Using the broadband switching system connected in step 1), multiple channels of CATV signals are transmitted from the center to each of the remote devices, and the remote devices do not use the CATV signals of the channels requested by the subscriber for videophone calls, etc. A CATV distribution system characterized by transmitting data to the subscriber in one of the time slots.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63065472A JPH01238392A (en) | 1988-03-18 | 1988-03-18 | Catv distributing system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63065472A JPH01238392A (en) | 1988-03-18 | 1988-03-18 | Catv distributing system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH01238392A true JPH01238392A (en) | 1989-09-22 |
Family
ID=13288087
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63065472A Pending JPH01238392A (en) | 1988-03-18 | 1988-03-18 | Catv distributing system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01238392A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5673264A (en) * | 1994-07-21 | 1997-09-30 | Hitachi, Ltd. | Image information distribution system |
US5757798A (en) * | 1994-07-21 | 1998-05-26 | Hitachi, Ltd. | Image information distribution system |
-
1988
- 1988-03-18 JP JP63065472A patent/JPH01238392A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5673264A (en) * | 1994-07-21 | 1997-09-30 | Hitachi, Ltd. | Image information distribution system |
US5757798A (en) * | 1994-07-21 | 1998-05-26 | Hitachi, Ltd. | Image information distribution system |
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