JPH0514396A - Data transmission equipment - Google Patents

Data transmission equipment

Info

Publication number
JPH0514396A
JPH0514396A JP16690491A JP16690491A JPH0514396A JP H0514396 A JPH0514396 A JP H0514396A JP 16690491 A JP16690491 A JP 16690491A JP 16690491 A JP16690491 A JP 16690491A JP H0514396 A JPH0514396 A JP H0514396A
Authority
JP
Japan
Prior art keywords
transfer
time
relay
relay route
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.)
Granted
Application number
JP16690491A
Other languages
Japanese (ja)
Other versions
JP2887952B2 (en
Inventor
Nobuyuki Kobayashi
信之 小林
Masayuki Etsuno
真行 越野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP16690491A priority Critical patent/JP2887952B2/en
Publication of JPH0514396A publication Critical patent/JPH0514396A/en
Application granted granted Critical
Publication of JP2887952B2 publication Critical patent/JP2887952B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Computer And Data Communications (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

PURPOSE:To secure the transfer time of each data and to equalize the load of junction lines and repeating stations by determining a repeating route for call setting in accordance with the repeating route selection probability where contents of transmission data and the actual load state are taken into consideration. CONSTITUTION:Repeating routes 20, 21, and 22 are used to periodically transmit a transfer time measuring packet from an originating station to a terminating station, and the terminating station adds the reception time of each packet to return it. The originating station receives it to calculate the transfer delay time by the difference between the transmission time and the incoming time and sets a transfer margin time to columns 52 and 53 of a pertinent repeating route in a transfer time table 50. The value obtained by dividing the transfer margin time by the total of transfer margin times of all repeating routes is set as a selection probability 54 of the pertinent repeating route. When a new call will be set, a repeating route is determined based on selection probabilities 54. Thus, calls and the load in a network are equalized and the transfer delay time is satisfied.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明はデータ伝送装置、さらに
詳しくはパケット交換網やATM(Asynchronous Transf
er Mode)網のようなデータ伝送網において中継ルートを
決定するデータ伝送装置に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission device, and more particularly to a packet switching network or ATM (Asynchronous Transf
er mode) data transmission network for determining a relay route in a data transmission network.

【0002】[0002]

【従来の技術】パケット交換網やATM網における中継
ルートの選択に関する先行技術としては、種々のものが
存在するが、例えば、特開平2−153695号公報
「迂回接続経路選択方法」がある。図1はパケット交換
網を簡略化した図で、本願発明の一実施例を説明するた
めの図であるが、従来の技術も同様のパケット交換網を
使用しており、図1を用いて従来の技術を説明する。図
において、1は発信局、2は着信局、3,4はそれぞれ
中継局、5は発信局1に接続されている端末、6は着信
局2に接続されている端末、10〜15はそれぞれ各局
1〜4を接続する中継線、20〜22の白抜きの矢印は
発信局1から着信局2までの選択が可能な各中継ルート
を示す。
2. Description of the Related Art There are various prior arts for selecting a relay route in a packet switching network or an ATM network. For example, there is JP-A-2-153695 "Detour connection route selection method". FIG. 1 is a simplified diagram of a packet switching network, and is a diagram for explaining an embodiment of the present invention. The conventional technique also uses the same packet switching network. I will explain the technology. In the figure, 1 is a transmitting station, 2 is a receiving station, 3 and 4 are relay stations, 5 is a terminal connected to the transmitting station 1, 6 is a terminal connected to a receiving station 2, and 10 to 15 are respectively. The relay lines connecting the stations 1 to 4 and the hollow arrows 20 to 22 indicate the respective relay routes that can be selected from the source station 1 to the destination station 2.

【0003】次に動作について説明する。例えば、端末
5から端末6に対して呼を設定し、発信局1から中継局
3を経由して着信局2へ送信する、中継ルート21が選
択される場合、中継局3は中継ルート21の回線である
中継線11,15の回線の空き情報を中継ルート使用情
報として発信局1へ送信する。発信局1は送られてきた
中継ルート使用情報を基に、中継ルート選択確率を記憶
し、発信局1から着信局2への次の呼設定時に各中継ル
ート(図1で言えば中継ルート20〜22)の選択確率
を参照し、実際に中継する中継ルートを決定する。
Next, the operation will be described. For example, when a call is set from the terminal 5 to the terminal 6 and the call is transmitted from the calling station 1 to the called station 2 via the relay station 3, when the relay route 21 is selected, the relay station 3 selects the relay route 21. The vacant information of the trunk lines 11 and 15 which are the lines is transmitted to the transmitting station 1 as the relay route use information. The originating station 1 stores the relay route selection probability on the basis of the relay route use information transmitted, and at the time of the next call setup from the originating station 1 to the terminating station 2, each of the relay routes (the relay route 20 in FIG. 1). 22), the relay route to be actually relayed is determined with reference to the selection probability.

【0004】さらに詳しく言えば、例えば、空き回線の
無い中継ルートに対しては0.1、空き回線が有る中継
ルートに対しては残りの0.9を分配する。発信局1で
は、迂回接続路状態メモリを参照して、選択確率情報の
内容に従って確率的に迂回接続経路を選択する。
More specifically, for example, 0.1 is distributed to a relay route having no empty line, and the remaining 0.9 is distributed to a relay route having an empty line. The originating station 1 refers to the bypass connection path state memory and stochastically selects the bypass connection path according to the content of the selection probability information.

【0005】[0005]

【発明が解決しようとする課題】解決しようとする問題
点は、従来のデータ伝送装置は以上のように回線使用情
報に基づく中継ルート選択確率により、新たな呼の使用
する中継ルートを決定しているため、中継局が増加する
と中継ルート使用情報を監視するための中継回線や中継
ルート使用情報を報告する中継局が増大し、発信局にお
ける各中継ルート選択確率の算出が複雑化し困難になる
点にある。また、回線使用情報に基づく中継ルート選択
確率では、中継局が実際に行っているデータ伝送処理の
負荷状態が反映されていないため、当該発信局および当
該受信局以外の他局同志のデータ伝送処理を行っていて
負荷の高い中継ルートを選択してしまう可能性があり、
中継線や中継局の負荷が不均一になる等の問題点があっ
た。
The problem to be solved is that the conventional data transmission apparatus determines the relay route to be used for a new call by the relay route selection probability based on the line usage information as described above. Therefore, when the number of relay stations increases, the number of relay lines for monitoring relay route usage information and the number of relay stations reporting relay route usage information also increase, and the calculation of each relay route selection probability at the originating station becomes complicated and difficult. It is in. In addition, since the relay route selection probability based on the line usage information does not reflect the load state of the data transmission processing actually performed by the relay station, the data transmission processing of other stations other than the source station and the receiving station is performed. There is a possibility that you will select a relay route with a high load,
There were problems such as uneven load on the relay lines and relay stations.

【0006】本発明はかかる課題を解決するためになさ
れたもので、伝送されるデータの内容や実際の負荷状態
を考慮した中継ルート選択確率により呼設定時の中継ル
ートを決定することで、各データの転送時間を保証しな
がら中継線や中継局の負荷を均等に保ちデータ伝送が行
えるデータ伝送装置を得ることを目的としている。
The present invention has been made to solve the above problems, and determines the relay route at the time of call setting by the relay route selection probability in consideration of the contents of data to be transmitted and the actual load state. It is an object of the present invention to obtain a data transmission device capable of performing data transmission while guaranteeing the data transfer time and keeping the load on the relay lines and relay stations even.

【0007】[0007]

【課題を解決するための手段】本発明に係わるデータ伝
送装置は、全ての中継ルートについて周期的にデータ転
送遅延時間を測定し、伝送データの内容に基づき予め定
めた許容最大転送時間から中継ルート毎のデータ転送遅
延時間を引いて中継ルート毎の転送余裕時間を算出し、
この転送時間の比を中継ルート選択確率とし、新たな呼
を設定する場合はこの中継ルート選択確率に従って中継
ルートを決定することを特徴としている。
A data transmission apparatus according to the present invention periodically measures a data transfer delay time for all relay routes, and determines a relay route from an allowable maximum transfer time predetermined based on the content of transmission data. Calculate the transfer margin time for each relay route by subtracting the data transfer delay time for each
This transfer time ratio is used as a relay route selection probability, and when a new call is set, the relay route is determined according to this relay route selection probability.

【0008】[0008]

【作用】本発明においては、中継ルート毎の転送余裕時
間の比を中継ルート選択確率とし、新たな呼を設定する
場合はこの中継ルート選択確率に従って中継ルートを決
定することにより、伝送データの内容や中継局でのデー
タ転送処理の負荷も含めた中継ルートの決定が可能とな
り、中継線や中継局の負荷を均等に保つことができる。
According to the present invention, the ratio of the transfer margin time for each relay route is used as the relay route selection probability, and when a new call is set, the relay route is determined in accordance with this relay route selection probability, so that the content of the transmission data is determined. It is possible to determine the relay route including the load of data transfer processing at the relay station, and it is possible to keep the load on the relay line and the relay station even.

【0009】なお、この種のデータ伝送装置における中
継ルート決定方法としては、上述の従来例の他に、例え
ば、パケット流のバースト性を考慮した、特開平2−2
90352号公報「パケット交換網における制御方法及
びルート設定方法並びに呼設定方法」などがあり、ま
た、各中継ルートの転送時間測定方法に関する先行技術
としては、例えば、特開平2−189046号公報「パ
ケット交換網における転送遅延時間測定方法」が存在す
る。本願発明は伝送データの内容に基づき定められる許
容最大転送時間から実際のデータ転送遅延時間を引いて
中継ルート毎の転送余裕時間を算出し、この転送余裕時
間の比を中継ルート選択確率とすることを発明の要旨と
している。従って、遅延時間に対する制約の強い伝送デ
ータを統合的に扱う高速データ伝達網に対しても各呼の
データ転送遅延時間を満足させることができる。
Incidentally, as a relay route determination method in this type of data transmission apparatus, in addition to the above-mentioned conventional example, for example, in consideration of the burst property of the packet flow, Japanese Patent Laid-Open No. 2-2
No. 90352, “Control method, route setting method, call setting method in packet switching network” and the like. Further, as a prior art relating to a transfer time measuring method of each relay route, for example, Japanese Unexamined Patent Publication No. 2-189046 “Packet There is a method for measuring transfer delay time in a switching network ”. The present invention calculates the transfer margin time for each relay route by subtracting the actual data transfer delay time from the maximum allowable transfer time determined based on the content of the transmission data, and sets the ratio of this transfer margin time as the relay route selection probability. Is the gist of the invention. Therefore, it is possible to satisfy the data transfer delay time of each call even for a high-speed data transmission network that handles transmission data having a severe restriction on the delay time.

【0010】[0010]

【実施例】以下、本発明の一実施例を図面を用いて説明
する。図1は本発明で実施されるパケット交換網を簡略
化した図で、図1については従来の技術で説明してお
り、ここでは重複した説明は省略する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a simplified diagram of a packet switching network implemented in the present invention. FIG. 1 has been described in the related art, and a duplicate description will be omitted here.

【0011】図2は、発信局1と着信局2との間のデー
タ転送時間を測定するシーケンスを示し、図において、
30は中継ルート20を使った場合のデータ転送時間を
測定する転送時間測定パケット、31は中継局3を経由
する中継ルート21を使った場合のデータ転送時間を測
定する転送時間測定パケット、32は中継局4を経由す
る中継ルート22を使った場合のデータ転送時間を測定
する転送時間測定パケットを示す。また、40,41,
42は、それぞれ転送時間測定パケット、30,31,
32に対する転送時間通知パケット、50は発信局の持
つ転送時間テーブルを示す。
FIG. 2 shows a sequence for measuring the data transfer time between the source station 1 and the destination station 2. In the figure,
30 is a transfer time measurement packet for measuring the data transfer time when the relay route 20 is used, 31 is a transfer time measurement packet for measuring the data transfer time when the relay route 21 passing through the relay station 3 is used, and 32 is 7 shows a transfer time measurement packet for measuring the data transfer time when the relay route 22 passing through the relay station 4 is used. Also, 40, 41,
42 is a transfer time measurement packet, 30, 31,
The transfer time notification packet for 32, and 50 for the transfer time table of the originating station.

【0012】また、図3は転送時間測定パケット33と
転送時間通知パケット43の構成を示すフォーマットで
あり、34,44は指定された中継ルートに基づいて網
内を中継させるための中継ヘッダ、35,45は測定す
る中継ルート番号、36,46は発信局1での転送時間
測定パケット送信時刻、37は転送時間測定パケット3
3の長さを典型的なユーザデータパケット長に合わせる
ためのダミーデータ、47は着信局2における転送時間
測定パケット受信時刻を示す。
FIG. 3 is a format showing the structure of the transfer time measurement packet 33 and the transfer time notification packet 43. 34 and 44 are relay headers for relaying in the network based on a designated relay route, and 35. , 45 is a relay route number to be measured, 36 and 46 are transfer time measurement packet transmission times at the transmitting station 1, and 37 is transfer time measurement packet 3
Dummy data for adjusting the length of 3 to a typical user data packet length, 47 indicates a transfer time measurement packet reception time at the receiving station 2.

【0013】次の図4は、図2の50に示す発信局1の
転送時間テーブルの内容を示す図で、各中継ルート毎
に、中継ルート番号51、各中継ルートを使用して測定
した転送遅延時間52、予め定められた許容最大転送時
間(この実施例では一律500msecとしている)か
ら転送遅延時間52を引いた転送余裕時間53、全ての
中継ルートの転送余裕時間53の合計を1.0とした場
合の各中継ルート毎の転送余裕時間の比である中継ルー
ト選択確立54の各欄が設けられている。
Next, FIG. 4 is a diagram showing the contents of the transfer time table of the transmitting station 1 shown by 50 in FIG. 2, and the transfer route number 51 and the transfer measured using each relay route for each relay route. The total of the delay time 52, the transfer margin time 53 obtained by subtracting the transfer delay time 52 from the predetermined maximum allowable transfer time (500 msec in this embodiment), and the transfer margin time 53 of all relay routes is 1.0. In this case, each column of relay route selection establishment 54, which is the ratio of the transfer margin time for each relay route in the case of, is provided.

【0014】次に動作について説明する。図1に示すよ
うに、発信局1と着信局2との間に、各々中継ルート2
0,21,22が設定されている場合、図2に示すよう
に、発信局1は周期的に着信局2に対して各中継ルート
を使用し転送時間測定パケット30,31,32を送信
する。送信される転送時間測定パケット30〜32は、
それぞれ図3の33に示すように、着信局2に対してパ
ケットを転送するために必要な、中継ヘッダ34,中継
ルート番号35,発信局送信時刻36,ダミーユーザデ
ータ37が設定される。
Next, the operation will be described. As shown in FIG. 1, a relay route 2 is provided between a source station 1 and a destination station 2.
When 0, 21, 22 are set, the originating station 1 periodically uses each relay route to the destination station 2 to transmit transfer time measurement packets 30, 31, 32 as shown in FIG. .. The transfer time measurement packets 30 to 32 transmitted are
As indicated by reference numeral 33 in FIG. 3, a relay header 34, a relay route number 35, a transmission station transmission time 36, and dummy user data 37 required for transferring a packet to the destination station 2 are set.

【0015】転送時間測定パケット30〜32を受信し
た着信局2は、各々の転送時間測定パケット30〜32
について、ダミーユーザデータ37を削除し、着信局2
における各パケット30〜32の着信局受信時刻47を
付加し、転送時間通知パケット40,41,42を返送
する。
The receiving station 2 which has received the transfer time measurement packets 30 to 32 receives the transfer time measurement packets 30 to 32, respectively.
, The dummy user data 37 is deleted, and the receiving station 2
The destination station reception time 47 of each of the packets 30 to 32 is added, and the transfer time notification packets 40, 41, 42 are returned.

【0016】転送時間通知パケット40,41,42を
受信した発信局1は、転送時間通知パケットの中の発信
局送信時刻46と着信局受信時刻47との差により、転
送遅延時間を算出し、着信局2宛の転送時間テーブル5
0の該当する中継ルートの転送遅延時間53の欄に当該
転送遅延時間を設定する。
The transmitting station 1, which has received the transfer time notification packets 40, 41, 42, calculates the transfer delay time from the difference between the transmitting station transmitting time 46 and the receiving station receiving time 47 in the transfer time notifying packet, Transfer time table 5 for destination station 2
The transfer delay time is set in the transfer delay time 53 column of the corresponding relay route of 0.

【0017】また、同時に伝送データが許容できる許容
最大転送時間から転送遅延時間の差を算出し、転送余裕
時間53として転送時間テーブル50に設定し、さら
に、該当中継ルートの転送余裕時間を全中継ルートの転
送余裕時間の合計で割った値を当該中継ルートの選択確
立54として設定する。また、転送遅延時間52が許容
最大転送時間より大きい場合は、転送余裕時間は0と
し、中継ルート選択確立54は0を設定する。そして、
発信局1から着信局2に対して新たな呼を設定する場合
は、転送時間テーブル50の中継ルート選択確立54に
基づき、当該呼の使用する中継ルートを決定する。以上
のように、使用する中継ルートを転送遅延時間に基づく
中継ルートの負荷状態により新たな呼を分散させること
で、網内の中継線や中継局の負荷を均等にでき、各呼に
ついても転送遅延時間を満足させることができる。
At the same time, the difference in transfer delay time is calculated from the maximum allowable transfer time that the transmission data can tolerate, and the transfer allowance time 53 is set in the transfer time table 50. Furthermore, the transfer allowance time of the relay route is relayed. A value divided by the total transfer margin time of the route is set as the selection establishment 54 of the relay route. If the transfer delay time 52 is larger than the maximum allowable transfer time, the transfer margin time is set to 0, and the relay route selection establishment 54 is set to 0. And
When a new call is set from the calling station 1 to the called station 2, the relay route used by the call is determined based on the relay route selection establishment 54 of the transfer time table 50. As described above, by distributing new calls according to the load state of the relay route used based on the transfer delay time, the load on the relay lines and relay stations in the network can be equalized, and each call is also transferred. The delay time can be satisfied.

【0018】なお上記実施例は、伝送データの遅延時間
に対する制約の弱いパケットデータのみを取り扱うパケ
ット交換網を用いているため、各中継ルートの許容最大
転送時間を一律に定めているが、例えば、音声データや
画像データ等の遅延時間に対する制約の強い伝送データ
を統合的に扱う高速データ伝送網に対しては、伝送デー
タの種類に応じて複数の許容最大転送時間を定義すると
共に、転送時間テーブルの転送余裕時間および中継ルー
ト選択確率の欄も各転送データごと複数設けることによ
り、呼設定時に伝送データの種類に応じ転送遅延時間を
満足する中継ルートの選択が可能となる。
In the above embodiment, since the packet switching network that handles only the packet data with a weak restriction on the delay time of the transmission data is used, the maximum allowable transfer time of each relay route is uniformly set. For a high-speed data transmission network that handles transmission data such as voice data and image data that has a strong constraint on the delay time in an integrated manner, define multiple allowable maximum transfer times according to the type of transmission data, and transfer time table. By providing a plurality of transfer margin time and relay route selection probability fields for each transfer data, it becomes possible to select a relay route that satisfies the transfer delay time according to the type of transmission data at the time of call setup.

【0019】[0019]

【発明の効果】以上のように本発明のデータ転送装置
は、実際の負荷状態を考慮した中継ルート選択確率によ
り新たな呼の中継ルートを決定するため、中継ルートの
負荷状態により新たな呼を分散させることができ、中継
線や中継局の負荷を均等に保つことができる。また、遅
延時間に対する制約の強い伝送データに対しても転送遅
延時間を満足する中継ルートの選択が可能となる等の利
点がある。
As described above, since the data transfer apparatus of the present invention determines the relay route of a new call by the relay route selection probability in consideration of the actual load condition, the new call is determined by the load condition of the relay route. It can be distributed, and the load on the trunk line and the relay station can be kept uniform. Further, there is an advantage that it is possible to select a relay route that satisfies the transfer delay time even for transmission data having a strong restriction on the delay time.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明が実施されるパケット交換網を簡略化し
た図である。
FIG. 1 is a simplified diagram of a packet switched network in which the present invention is implemented.

【図2】本発明の一実施例におけるデータ転送時間を測
定するシーケンスを示す図である。
FIG. 2 is a diagram showing a sequence for measuring a data transfer time according to an embodiment of the present invention.

【図3】本発明の一実施例における転送時間測定パケッ
トと転送通知パケットの構成を示すフォーマット図であ
る。
FIG. 3 is a format diagram showing configurations of a transfer time measurement packet and a transfer notification packet according to an embodiment of the present invention.

【図4】本発明の一実施例における転送時間テーブルの
内容を示す図である。
FIG. 4 is a diagram showing the contents of a transfer time table in an embodiment of the present invention.

【符号の説明】 1 発信局 2 着信局 20〜22 中継ルート 50 転送時間テーブル 51 中継ルート番号 52 転送遅延時間 53 転送余裕時間 54 選択確率[Explanation of Codes] 1 Source station 2 Destination station 20-22 Relay route 50 Transfer time table 51 Relay route number 52 Transfer delay time 53 Transfer margin time 54 Selection probability

Claims (1)

【特許請求の範囲】 【請求項1】 パケット交換網やATM(Asynchronous
Transfer Mode)網など発信局から着信局に至る中継ルー
トを複数有するデータ伝送網で呼設定時に複数の中継ル
ートのうち1つの中継ルートを選択してデータ伝送を行
うデータ伝送装置において、 伝送データの内容に基づき予め許容最大転送時間を定め
る手段、 全ての中継ルートについて、データ転送遅延時間を周期
的に計測し、更新する手段、 伝送データの内容により定められた許容最大転送時間か
ら各中継ルート毎のデータ転送遅延時間を引いて各中継
ルート毎の転送余裕時間を算出し、それぞれの転送余裕
時間の比をそれぞれ中継ルート選択確率として上記発信
局の転送時間テーブルに保持し、更新する手段、 上記発信局で新たな呼を設定する場合には上記転送時間
テーブルを検索し、その時の各中継ルート選択確率に従
って中継ルートを決定する手段、 を備えたことを特徴とするデータ伝送装置。
Claims: 1. A packet switching network or an ATM (Asynchronous)
Transfer Mode) In a data transmission system that has multiple relay routes from the source station to the destination station, such as a data transmission device that selects one relay route from among multiple relay routes at the time of call setup and performs data transmission. Means to predetermine the maximum allowable transfer time based on the contents, Means to periodically measure and update the data transfer delay time for all relay routes, From the maximum allowable transfer time defined by the contents of the transmission data to each relay route Means for calculating the transfer margin time for each relay route by subtracting the data transfer delay time, and holding and updating the ratio of each transfer margin time as the relay route selection probability in the transfer time table of the transmitting station, When setting a new call at the calling station, the transfer time table is searched and the relay route is selected according to the relay route selection probability at that time. Determining means, the data transmission apparatus characterized by comprising a.
JP16690491A 1991-07-08 1991-07-08 Data transmission equipment Expired - Lifetime JP2887952B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16690491A JP2887952B2 (en) 1991-07-08 1991-07-08 Data transmission equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16690491A JP2887952B2 (en) 1991-07-08 1991-07-08 Data transmission equipment

Publications (2)

Publication Number Publication Date
JPH0514396A true JPH0514396A (en) 1993-01-22
JP2887952B2 JP2887952B2 (en) 1999-05-10

Family

ID=15839794

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16690491A Expired - Lifetime JP2887952B2 (en) 1991-07-08 1991-07-08 Data transmission equipment

Country Status (1)

Country Link
JP (1) JP2887952B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07154397A (en) * 1993-11-26 1995-06-16 Nec Corp Method and device for reducing cell abandonment
US6154444A (en) * 1996-10-25 2000-11-28 Nec Corporation Source routing method for fast connection re-establishment in response to early-arriving trouble report messages
JP2012075072A (en) * 2009-12-25 2012-04-12 Ricoh Co Ltd Transmission terminal, program for transmission terminal, program provision system, and maintenance system
US8885008B2 (en) 2009-12-25 2014-11-11 Ricoh Company, Limited Transmission management system, transmission system, computer program product, program providing system, and maintenance system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61239748A (en) * 1985-04-17 1986-10-25 Hitachi Ltd Diagnostic system for packet exchange network
JPH02153695A (en) * 1988-12-05 1990-06-13 Nippon Telegr & Teleph Corp <Ntt> Bypass connection path selecting method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61239748A (en) * 1985-04-17 1986-10-25 Hitachi Ltd Diagnostic system for packet exchange network
JPH02153695A (en) * 1988-12-05 1990-06-13 Nippon Telegr & Teleph Corp <Ntt> Bypass connection path selecting method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07154397A (en) * 1993-11-26 1995-06-16 Nec Corp Method and device for reducing cell abandonment
US6154444A (en) * 1996-10-25 2000-11-28 Nec Corporation Source routing method for fast connection re-establishment in response to early-arriving trouble report messages
JP2012075072A (en) * 2009-12-25 2012-04-12 Ricoh Co Ltd Transmission terminal, program for transmission terminal, program provision system, and maintenance system
US8885008B2 (en) 2009-12-25 2014-11-11 Ricoh Company, Limited Transmission management system, transmission system, computer program product, program providing system, and maintenance system
US9253438B2 (en) 2009-12-25 2016-02-02 Ricoh Company, Limited Transmission management system, transmission system, computer program product, program providing system, and maintenance system

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Publication number Publication date
JP2887952B2 (en) 1999-05-10

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