JP2602356B2 - ISDN remote subscriber line accommodation equipment test method - Google Patents
ISDN remote subscriber line accommodation equipment test methodInfo
- Publication number
- JP2602356B2 JP2602356B2 JP2288847A JP28884790A JP2602356B2 JP 2602356 B2 JP2602356 B2 JP 2602356B2 JP 2288847 A JP2288847 A JP 2288847A JP 28884790 A JP28884790 A JP 28884790A JP 2602356 B2 JP2602356 B2 JP 2602356B2
- Authority
- JP
- Japan
- Prior art keywords
- isdn
- subscriber line
- test
- circuit
- remote
- 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.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/22—Arrangements for supervision, monitoring or testing
- H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
- H04M3/28—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor
- H04M3/30—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop
- H04M3/301—Circuit arrangements at the subscriber's side of the line
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明はISDN遠隔加入者収容装置試験方式に関し、特
に試験用チャネルに直接接続した信号変換回路を使用し
て試験用呼制御情報の送受を行い試験実行するISDN遠隔
加入者線収容装置試験方式に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ISDN remote subscriber accommodating apparatus test system, and more particularly to transmitting and receiving test call control information using a signal conversion circuit directly connected to a test channel. The present invention relates to an ISDN remote subscriber line accommodating equipment test method for performing a test.
従来のISDN遠隔加入者収容装置試験方式は、第２図の
ブロック図に示すように、遠隔地のISDN加入者23,24をI
SDN入者線を介して収容するISDN遠隔加入者線収容装置3
1と、ISDN遠隔加入者線収容装置31を、多重化された伝
送路を介して収容する多重化伝送路収容装置34とで構成
するISDN交換システムのISDN遠隔加入者線収容装置31内
に、ISDN加入者線と接続するISDN加入者線終端回路３を
ISDN加入者線から切替えて引込む試験用引込みリレー２
と、試験用引込みリレー２で引込んだISDN加入者線終端
回路３とISDN加入者線インタフェース回路17とを試験用
引込みリンク４を介して接続し、ISDN加入者線終端回路
３とISDN加入者線インタフェース回路17とISDN交換機制
御リンク送受信ポート33とを収容し分離および挿入する
多重分離回路５と、多重分離回路５と多重化伝送路20と
を接続する多重化伝送路インタフェース９と、ISDN遠隔
加入者線収容装置31内の各装置を制御する遠隔装置制御
プロセッサ32とを設け、多重化伝送路収容装置34内に、
多重化伝送路20と接続する多重化伝送路インタフェース
11と、ISDN交換機制御リンク送受信ポート33との間で制
御信号の送受を行う遠隔装置制御リンク送受信ポート36
と、遠隔試験を行うための試験端末25を接続する機能を
持つ試験端末インタフェース回路16と、多重化伝送路イ
ンタフェース11と遠隔装置制御リンク送受信ポート36と
試験端末インタフェース回路16とを収容し挿入および分
離する多重分離回路12と、多重化伝送路収容装置34内の
各装置を制御する多重化伝送路制御プロセッサ35とを設
けてある。As shown in the block diagram of FIG. 2, the conventional ISDN remote subscriber accommodating equipment test method uses the ISDN subscribers 23 and 24 at remote locations as I
ISDN remote subscriber line accommodation device 3 accommodated via SDN subscriber line
1 and an ISDN remote subscriber line accommodating device 31 of an ISDN switching system comprising an ISDN remote subscriber line accommodating device 31 for accommodating the ISDN remote subscriber line accommodating device via a multiplexed transmission line. ISDN subscriber line termination circuit 3 for connecting to ISDN subscriber line
Test drop relay 2 for switching from ISDN subscriber line
The ISDN subscriber line terminating circuit 3 and the ISDN subscriber line interface circuit 17 which are pulled in by the test drop relay 2 are connected via the test drop link 4, and the ISDN subscriber line terminating circuit 3 and the ISDN subscriber are connected. Demultiplexing circuit 5 for accommodating and demultiplexing and inserting line interface circuit 17 and ISDN exchange control link transmission / reception port 33, multiplex transmission line interface 9 connecting demultiplexing circuit 5 and multiplex transmission line 20, and ISDN remote A remote device control processor 32 for controlling each device in the subscriber line accommodation device 31 is provided, and in the multiplex transmission line accommodation device 34,
Multiplexed transmission line interface connected to multiplexed transmission line 20
11 and a remote device control link transmission / reception port 36 for transmitting and receiving control signals between the ISDN exchange control link transmission / reception port 33
And a test terminal interface circuit 16 having a function of connecting a test terminal 25 for performing a remote test, and a multiplex transmission line interface 11, a remote device control link transmission / reception port 36, and a test terminal interface circuit 16, A demultiplexing circuit 12 for demultiplexing and a multiplex transmission line control processor 35 for controlling each device in the multiplex transmission line accommodation device 34 are provided.
次に動作について説明する。 Next, the operation will be described.
遠隔試験は、ISDN交換機制御リンク送受信ポート33と
遠隔装置制御リンク送受信ポート36とが、それぞれ遠隔
装置制御プロセッサ32と多重化伝送路制御プロセッサ35
との制御の下で、ISDN遠隔加入者線収容装置31と多重化
伝送路収容装置34との間で予め定められた通信規約に従
って試験用制御情報の送受を行い、これらの試験用制御
情報と加入者線で使用する信号との変換を、ISDN加入者
線インタフェース回路17および試験端末インタフェース
回路16により行うことで実行するものであった。In the remote test, the ISDN exchange control link transmission / reception port 33 and the remote device control link transmission / reception port 36 are connected to the remote device control processor 32 and the multiplexed transmission line control processor 35, respectively.
Under the control of, the ISDN remote subscriber line accommodating device 31 and the multiplex transmission line accommodating device 34 transmit and receive test control information according to a predetermined communication protocol, and these test control information and The conversion to the signal used in the subscriber line is performed by performing the conversion by the ISDN subscriber line interface circuit 17 and the test terminal interface circuit 16.
上述した従来のISDN遠隔加入者線収容装置試験方式
は、ISDN遠隔加入者線収容装置31と多重化伝送路収容装
置34との間で予め定められた通信規約に従って試験用制
御情報の送受を行うため、ISDN−Ｄチャネル・プロトコ
ルの追加あるいは変更、さらに上位レイヤ・プロトコル
の変更が生じると、試験端末25に対してのみならず、多
重化伝送路制御プロセッサ35および遠隔装置制御プロセ
ッサ32の該当する試験に関する個所も変更しなくてはな
らないので、迅速な対応ができず非能率であるという問
題点と、変更個所が多く不経済であるという問題点とが
ある。The conventional ISDN remote subscriber line accommodating apparatus test method described above transmits and receives test control information between the ISDN remote subscriber line accommodating apparatus 31 and the multiplex transmission path accommodating apparatus 34 according to a predetermined communication protocol. Therefore, when the addition or change of the ISDN-D channel protocol or the change of the upper layer protocol occurs, not only the test terminal 25 but also the multiplex transmission path control processor 35 and the remote device control processor 32 Since the parts related to the test must also be changed, there is a problem that it is not possible to respond quickly and it is inefficient, and there is a problem that many changed parts are uneconomical.
本発明の目的は、ISDN−Ｄチャネル・プロトコルの追
加あるいは変更や上位レイヤ・プロトコルの変更が生じ
ても、試験端末のみの変更ですべての処置が可能な経済
的で能率の良いISDN遠隔加入者線収容装置試験方式を提
供することによる。SUMMARY OF THE INVENTION It is an object of the present invention to provide an economical and efficient ISDN remote subscriber capable of performing all measures by changing only a test terminal even if an addition or change of an ISDN-D channel protocol or a change of a higher layer protocol occurs. By providing a line containment equipment test scheme.
本発明のISDN遠隔加入者線収容装置試験方式は、遠隔
地のISDN加入者をISDN入者線を介して収容するISDN遠隔
加入者線収容装置と前記ISDN遠隔加入者線収容装置を多
重化された伝送路を介して収容する多重化伝送路収容装
置とを有するISDN交換システムのISDN遠隔加入者線収容
装置試験方式において、前記ISDN遠隔加入者線収容装置
は前記ISDN加入者線と接続するISDN加入者線終端回路を
前記ISDN加入者線から切替えて引込む引込み手段と、前
記引込み手段で引込んだ前記ISDN加入者線終端回路の信
号を受信し変換する第１の信号変換回路と、前記第１の
信号変換回路と接続し前記多重化された伝送路の任意の
チャネルを試験用チャネルとして分離および挿入する第
１の多重分離回路とを含み、前記多重化伝送路収容装置
は前記第１の多重分離回路と接続し前記多重化された伝
送路の任意のチャネルを試験用チャネルとして挿入およ
び分離する第２の多重分離回路と、前記第２の多重分離
回路が挿入および分離する試験用チャネルを加入者端末
を擬似する試験端末に適合するように信号変換する第２
の信号変換回路とを含み、前記引込み手段で引込んだ前
記ISDN加入者線終端回路と前記試験端末とを前記第１の
信号変換回路と前記第１の多重分離回路と前記多重化さ
れた伝送路と前記第２の多重分離回路と前記第２の信号
変換回路とを介して接続し試験を実行するための前記多
重化された伝送路を経由する試験用呼制御情報の送受を
前記第１の信号変換回路と前記第２の信号変換回路との
間で行う構成である。The ISDN remote subscriber line accommodating apparatus test system of the present invention comprises a multiplexing of an ISDN remote subscriber line accommodating apparatus accommodating a remote ISDN subscriber via an ISDN subscriber line and the ISDN remote subscriber line accommodating apparatus. In the ISDN remote subscriber line accommodating apparatus test method of the ISDN switching system having the multiplex transmission line accommodating apparatus accommodated via the transmission line, the ISDN remote subscriber line accommodating apparatus is connected to the ISDN subscriber line. A drop-in means for switching a subscriber line termination circuit from the ISDN subscriber line for pull-in; a first signal conversion circuit for receiving and converting a signal of the ISDN subscriber line termination circuit pulled in by the drop-in means; A first multiplexing / demultiplexing circuit connected to the first multiplexing transmission line and separating and inserting an arbitrary channel of the multiplexed transmission line as a test channel. Before connecting with demultiplexing circuit A second demultiplexing circuit for inserting and separating an arbitrary channel of the multiplexed transmission path as a test channel, and a test for simulating a subscriber terminal with a test channel inserted and separated by the second demultiplexing circuit 2nd signal conversion to fit terminal
The ISDN subscriber line terminating circuit and the test terminal pulled in by the pull-in means are transmitted to the first signal converting circuit, the first demultiplexing circuit, and the multiplexed transmission. The first and second multiplexing / demultiplexing circuits and the second signal conversion circuit for transmitting and receiving the test call control information via the multiplexed transmission line for executing a test. And the second signal conversion circuit.
次に、本発明の実施例について図面を参照して説明す
る。Next, embodiments of the present invention will be described with reference to the drawings.
第１図は本発明の一実施例のブロック図である。以下
従来と同一のものには同一名称同一符号を付与する。FIG. 1 is a block diagram of one embodiment of the present invention. Hereinafter, the same components as those in the related art are given the same reference numerals.
遠隔地のISDN加入者23,24をISDN加入者線を介して収
容するISDN遠隔加入者線収容装置１と、ISDN遠隔加入者
収容装置１を多重化された伝送路を介して収容する多重
化伝送路収容装置10とで構成するISDN交換システムのIS
DN遠隔加入者線収容装置１内には、ISDN加入者線と接続
するISDN加入者線終端回路３をISDN加入者線から切替え
て引込む試験用引込みリレー２と、試験用引込みリレー
２で引込んだISDN加入者線終端回路３を試験用引込みリ
ンク４を介して接続するISDNベーシックアクセス加入者
線のレイヤ１の端末側終端回路を持つ信号変換回路８
と、ISDN遠隔加入者線収容装置１と多重化伝送路収容装
置10との間で定義された制御信号を送受信するISDN交換
制御リンク送受信ポート６と、ISDN加入者線終端回路３
と信号変換回路８とISDN交換制御リンク送受信ポート６
とを収容し分離および挿入する多重分離回路５と、多重
分離回路５と多重化伝送路インタフェース９と、ISDN遠
隔加入者線収容装置１内の各装置を制御する遠隔装置制
御プロセッサ７とを設け、多重化伝送路収容装置10内に
は、多重化伝送路20と接続する多重化伝送路インタフェ
ース11と、ISDN交換機制御リンク送受信ポート６との間
で制御信号の送受を行う遠隔装置制御リンク送受信ポー
ト13と、遠隔試験を行うための加入者端末を擬似する試
験端末22に適合するように信号変換する信号変換回路15
と、多重化伝送路インタフェース11と遠隔装置制御リン
ク送受信ポート13と信号変換回路15とを収容し、伝送路
の任意のチャネルを試験用チャネルとして挿入および分
離する多重分離回路12と、多重化伝送路収容装置10内の
各装置を制御する多重化伝送路制御プロセッサ14とを設
けてある。ISDN remote subscriber line accommodating device 1 for accommodating remote ISDN subscribers 23 and 24 via ISDN subscriber lines, and multiplexing for accommodating ISDN remote subscriber accommodating device 1 via multiplexed transmission lines. IS of the ISDN switching system composed of the transmission line accommodation device 10
In the DN remote subscriber line accommodating apparatus 1, a test drop relay 2 for pulling in an ISDN subscriber line terminating circuit 3 connected to the ISDN subscriber line by switching from the ISDN subscriber line, and a test drop relay 2 are provided. A signal conversion circuit 8 having an ISDN basic access subscriber line layer 1 terminal-side termination circuit for connecting the ISDN subscriber line termination circuit 3 through a test drop-in link 4
An ISDN exchange control link transmission / reception port 6 for transmitting and receiving a control signal defined between the ISDN remote subscriber line accommodation device 1 and the multiplex transmission line accommodation device 10;
And signal conversion circuit 8 and ISDN exchange control link transmission and reception port 6
And a multiplexing / demultiplexing circuit 5, a multiplexing transmission line interface 9, and a remote device control processor 7 for controlling each device in the ISDN remote subscriber line accommodating device 1. The multiplex transmission line accommodating apparatus 10 has a multiplex transmission line interface 11 connected to the multiplex transmission line 20 and a remote device control link transmission / reception for transmitting / receiving control signals between the ISDN exchange control link transmission / reception port 6. A port 13 and a signal conversion circuit 15 for performing signal conversion so as to be adapted to a test terminal 22 simulating a subscriber terminal for performing a remote test.
A multiplexing / demultiplexing circuit 12 for accommodating a multiplexed transmission line interface 11, a remote device control link transmission / reception port 13 and a signal conversion circuit 15 for inserting and separating an arbitrary channel of the transmission line as a test channel; A multiplex transmission line control processor 14 for controlling each device in the path accommodation device 10 is provided.
次に動作について説明する。 Next, the operation will be described.
試験端末22は、試験のための制御信号を遠隔装置制御
リンク送受信ポート13から送出する。この制御信号は、
ISDN交換機制御ランク送受信ポート６で受信され、ISDN
交換機制御リンク送受信ポート６は、制御信号で指定さ
れた試験用引込みリレー２を動作し、ISDN加入者線と接
続するISDN加入者線終端回路３をISDN加入者線から切替
えて信号変換回路８に引込む。これで被試験ISDN加入者
終端回路３の2B＋Ｄは、信号変換回路８を経由して多重
分離回路５に接続することになる。多重分離回路５は、
多重伝送路20の空チャネルを試験用チャネルとして信号
変換回路８に接続し、被試験ISDN加入者線終端回路３の
2B＋Ｄを多重化伝送路収容装置10に延長する。多重化伝
送路収容装置10では、試験用チャネルとして接続された
被試験ISDN加入者線終端回路３の2B＋Ｄを多重分離回路
12で分離し、信号変換装置15に接続する。以後試験端末
22は、遠隔地のISDN加入者23（あるいは24）として動作
し、各種の試験、例えば発信試験および着信試験等を行
うことができる。The test terminal 22 sends a control signal for the test from the remote device control link transmission / reception port 13. This control signal
ISDN exchange control rank received at port 6
The exchange control link transmission / reception port 6 operates the test drop relay 2 specified by the control signal, and switches the ISDN subscriber line termination circuit 3 connected to the ISDN subscriber line from the ISDN subscriber line to the signal conversion circuit 8. Pull in. As a result, 2B + D of the ISDN subscriber termination circuit 3 under test is connected to the demultiplexing circuit 5 via the signal conversion circuit 8. The demultiplexing circuit 5
The vacant channel of the multiplex transmission line 20 is connected to the signal conversion circuit 8 as a test channel, and is connected to the ISDN subscriber line termination circuit 3 under test.
2B + D is extended to the multiplex transmission line accommodation device 10. In the multiplex transmission line accommodating apparatus 10, 2B + D of the ISDN subscriber line termination circuit 3 under test connected as a test channel is demultiplexed.
The signal is separated at 12 and connected to the signal converter 15. Test terminal
The 22 operates as an ISDN subscriber 23 (or 24) at a remote place, and can perform various tests, for example, an outgoing call test and an incoming call test.
以上説明したように、本発明は、遠隔地のISDN加入者
に替えて接続しISDN加入者線終端回路の信号を受信し変
換する第１の信号変換回路と、加入者端末を擬似する試
験端末に適合するように信号変換する第２の信号変換回
路とを設けることにより、ISDN−Ｄチャネル・プロトコ
ルの追加あるいは変更や上位レイヤ・プロトコルの変更
が生じても、試験端末のみの変更ですべての処置が可能
となり経済的で能率も良くなるという効果がある。As described above, the present invention provides a first signal conversion circuit for connecting to a remote ISDN subscriber and receiving and converting a signal of an ISDN subscriber line termination circuit, and a test terminal for simulating a subscriber terminal. And a second signal conversion circuit that converts the signal so as to conform to the requirements described above, even if the addition or change of the ISDN-D channel protocol or the change of the upper layer protocol occurs, the change of only the test terminal is sufficient. The treatment can be performed, and there is an effect that the cost is improved and the efficiency is improved.
第１図は本発明の一実施例のブロック図、第２図は従来
のISDN遠隔加入者線収容装置試験方式のブロック図であ
る。 １……ISDN遠隔加入者線収容装置、２……試験用引込み
リレー、３……ISDN加入者線終端回路、４……試験用引
込みリンク、5,12……多重分離回路、６……ISDN交換機
制御リンク送受信ポート、７……遠隔装置制御プロセッ
サ、8,15……信号変換回路、9,11……多重化伝送路イン
タフェース、10……多重化伝送路収容装置、13……遠隔
装置制御リンク送受信ポート、14……多重化伝送路制御
プロセッサ、20……多重化伝送路、22……試験端末、2
3,24……遠隔地のISDN加入者。FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional ISDN remote subscriber line accommodating apparatus test method. DESCRIPTION OF SYMBOLS 1 ... ISDN remote subscriber line accommodation equipment, 2 ... Test drop-in relay, 3 ... ISDN subscriber line termination circuit, 4 ... Test drop-in link, 5, 12 ... Demultiplexing circuit, 6 ... ISDN Switch control link transmission / reception port, 7: Remote device control processor, 8, 15: Signal conversion circuit, 9, 11: Multiplexed transmission line interface, 10: Multiplexed transmission line accommodating device, 13: Remote device control Link transmission / reception port, 14 multiplex transmission line control processor, 20 multiplex transmission line, 22 test terminal, 2
3,24 …… Remote ISDN subscribers.
Claims (1)
収容するISDN遠隔加入者線収容装置と前記ISDN遠隔加入
者線収容装置を多重化された伝送路を介して収容する多
重化伝送路収容装置とを有するISDN交換システムのISDN
遠隔加入者線収容装置試験方式において、前記ISDN遠隔
加入者線収容装置は前記ISDN加入者線と接続するISDN加
入者線終端回路を前記ISDN加入者線から切替えて引込む
引込み手段と、前記引込み手段で引込んだ前記ISDN加入
者線終端回路の信号を受信し変換する第１の信号変換回
路と、前記第１の信号変換回路と接続し前記多重化され
た伝送路の任意のチャネルを試験用チャネルとして分離
および挿入する第１の多重分離回路とを含み、前記多重
化伝送路収容装置は前記第１の多重分離回路と接続し前
記多重化された伝送路の任意のチャネルを試験用チャネ
ルとして挿入および分離する第２の多重分離回路と、前
記第２の多重分離回路が挿入および分離する試験用チャ
ネルを加入者端末を擬似する試験端末に適合するように
信号変換する第２の信号変換回路とを含み、前記引込み
手段で引込んだ前記ISDN加入者線終端回路と前記試験端
末とを前記第１の信号変換回路と前記第１の多重分離回
路と前記多重化された伝送路と前記第２の多重分離回路
と前記第２の信号変換回路とを介して接続し試験を実行
するための前記多重化された伝送路を経由する試験用呼
制御情報の送受を前記第１の信号変換回路と前記第２の
信号変換回路との間で行うことを特徴とするISDN遠隔加
入者収容装置試験方式。An ISDN remote subscriber line accommodating apparatus for accommodating a remote ISDN subscriber via an ISDN subscriber line and a multiplexing apparatus accommodating the ISDN remote subscriber line accommodating apparatus via a multiplexed transmission line. ISDN switching system with integrated transmission line accommodation equipment
In the remote subscriber line accommodating device test system, the ISDN remote subscriber line accommodating device switches in an ISDN subscriber line termination circuit connected to the ISDN subscriber line from the ISDN subscriber line and retracts, and the retracting means. A first signal conversion circuit for receiving and converting the signal of the ISDN subscriber line termination circuit pulled in at step (c), and connecting an arbitrary channel of the multiplexed transmission line to the first signal conversion circuit for testing. A first multiplexing / demultiplexing circuit for separating and inserting as a channel, wherein the multiplexed transmission line accommodating device is connected to the first multiplexing / demultiplexing circuit and an arbitrary channel of the multiplexed transmission line is used as a test channel. A second demultiplexing circuit for inserting and demultiplexing, and a second signal for converting a test channel inserted and demultiplexed by the second demultiplexing circuit so as to be compatible with a test terminal simulating a subscriber terminal A first signal conversion circuit, a first demultiplexing circuit, and the multiplexed transmission line. The first signal is used to transmit and receive test call control information via the multiplexed transmission path for connection and execution of a test through the second demultiplexing circuit and the second signal conversion circuit. An ISDN remote subscriber accommodation apparatus test method, which is performed between a conversion circuit and the second signal conversion circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2288847A JP2602356B2 (en) | 1990-10-25 | 1990-10-25 | ISDN remote subscriber line accommodation equipment test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2288847A JP2602356B2 (en) | 1990-10-25 | 1990-10-25 | ISDN remote subscriber line accommodation equipment test method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04160964A JPH04160964A (en) | 1992-06-04 |
| JP2602356B2 true JP2602356B2 (en) | 1997-04-23 |
Family
ID=17735520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2288847A Expired - Fee Related JP2602356B2 (en) | 1990-10-25 | 1990-10-25 | ISDN remote subscriber line accommodation equipment test method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2602356B2 (en) |
-
1990
- 1990-10-25 JP JP2288847A patent/JP2602356B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04160964A (en) | 1992-06-04 |
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| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
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| LAPS | Cancellation because of no payment of annual fees |