FMR CORP
SC 13G/A, 1998-03-10
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SCHEDULE 13G 
 
Amendment No. 2 
Saville Systems plc 
American Depositary Receipts 
Cusip # 805174109 
 
 
Cusip # 805174109 
Item 1:	Reporting Person - FMR Corp. 
Item 4:	Commonwealth of Massachusetts 
Item 5:	55,000 
Item 6:	None 
Item 7:	1,329,100 
Item 8:	None 
Item 9:	1,329,100 
Item 11:	4.01% 
Item 12:	HC  
 
 
 
 
Cusip # 805174109 
Item 1:	Reporting Person - Edward C. Johnson 3d  
Item 4:	United States of America 
Item 5:	None 
Item 6:	None 
Item 7:	1,329,100 
Item 8:	None 
Item 9:	1,329,100 
Item 11:	4.01% 
Item 12:	IN  
 
 
 
Cusip # 805174109 
Item 1:	Reporting Person - Abigail P. Johnson  
Item 4:	United States of America 
Item 5:	None 
Item 6:	None 
Item 7:	1,329,100 
Item 8:	None 
Item 9:	1,329,100 
Item 11:	4.01% 
Item 12:	IN  
 
 
 
SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS 
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b) 
 
 
Item 1(a).	Name of Issuer: 
 
		Saville Systems plc 
 
Item 1(b).	Name of Issuer's Principal Executive Offices: 
 
		25 Burlington Mall Road 6th Floor  
		Burlington, MA  1803 
 
Item 2(a).	Name of Person Filing:  
 
		FMR Corp. 
 
Item 2(b).	Address or Principal Business Office or, if None, Residence: 
 
		82 Devonshire Street, Boston, Massachusetts  02109 
 
Item 2(c).	Citizenship: 
 
		Not applicable 
 
Item 2(d).	Title of Class of Securities: 
 
		American Depositary Receipts 
 
Item 2(e).	CUSIP Number:   
 
		805174109 
 
Item 3.	This statement is filed pursuant to Rule 13d-1(b) or 13d-2(b) and the  
person filing, FMR Corp., is a parent holding company in accordance  
with Section 240.13d-1(b)(ii)(G).  (Note:  See Item 7). 
 
Item 4.	Ownership 
 
	(a)	Amount Beneficially Owned: 
	1,329,100 
 
	(b)	Percent of Class: 
	4.01% 
 
	(c)	Number of shares as to which such person has:   
 
	(i)	sole power to vote or to direct the vote: 
	55,000 
 
	(ii)	shared power to vote or to direct the vote: 
	None 
 
	(iii)	sole power to dispose or to direct the disposition of: 
	1,329,100 
 
	(iv)	shared power to dispose or to direct the disposition of: 
	None 
 
 
 
 
Item 5.	Ownership of Five Percent or Less of a Class. 
 
	If this statement is being filed to report the fact that as of  
the date hereof, the reporting person has ceased to be the  
beneficial owner of more than five percent of the class of  
securities, check the following (X). 
 
Item 6.	Ownership of More than Five Percent on Behalf of Another Person. 
 
	Not applicable. 
 
Item 7.	Identification and Classification of the Subsidiary Which Acquired  
the Security Being Reported on By the Parent Holding Company. 
 
	See attached Exhibit(s) A, B, and C. 
 
Item 8.	Identification and Classification of Members of the Group. 
 
	Not applicable, see attached Exhibit A.  
 
Item 9.	Notice of Dissolution of Group. 
 
	Not applicable. 
 
Item 10.	Certification. 
 
	Inasmuch as the reporting persons are no longer the beneficial  
owners of more than five percent of the number of American  
Depositary Receipts outstanding, the reporting persons have no  
further reporting obligation under Section 13(d) of the  
Securities and Exchange Commission thereunder, and the  
reporting persons have no obligation to amend this Statement if  
any material change occurs in the facts set forth herein. 
 
 
Signature 
 
	After reasonable inquiry and to the best of my knowledge and  
belief, I certify that the information set forth in this  
Schedule 13G in connection with FMR Corp.'s beneficial  
ownership of the American Depositary Receipts of Saville  
Systems plc at February 28, 1998 is true, complete and correct.  
 
 
	March 10, 1998	 
Date 
 
 
 
	/s/Eric D. Roiter 
Signature 
 
 
 
	Eric D. Roiter	 
Duly authorized under Power of  
Attorney 
dated December 30, 1997, by  
and on behalf 
of FMR Corp. and its direct  
and indirect 
subsidiaries 
 
 
 
 
SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS 
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b) 
 
	Pursuant to the instructions in Item 7 of Schedule 13G, Fidelity  
Management & Research Company ("Fidelity"), 82 Devonshire Street, Boston,  
Massachusetts 02109, a wholly-owned subsidiary of FMR Corp. and an investment  
adviser registered under Section 203 of the Investment Advisers Act of 1940,  
is the beneficial owner of 1,276,000 American Depositary Receipts or 3.85% of  
the American Depositary Receipts outstanding of Saville Systems plc ("the  
Company") as a result of acting as investment adviser to various investment  
companies registered under Section 8 of the Investment Company Act of 1940,  
and as a result of acting as sub-adviser to Fidelity American Special  
Situations Trust ("FASST").   
 
	FASST is a unit trust established and authorized by the Department of  
Trade and Industry under the laws of England.  The investment adviser of FASST  
is Fidelity Investment Services Limited, an English company and a subsidiary  
of Fidelity International Limited ("FIL"). 
 
	Edward C. Johnson 3d, FMR Corp., through its control of Fidelity, and the  
funds each has sole power to dispose of the 1,274,100 American Depositary  
Receipts owned by the Funds. 
 
	Neither FMR Corp. nor Edward C. Johnson 3d, Chairman of FMR Corp., has  
the sole power to vote or direct the voting of the American Depositary  
Receipts owned directly by the Fidelity Funds, which power resides with the  
Funds' Boards of Trustees.  Fidelity carries out the voting of the American  
Depositary Receipts under written guidelines established by the Funds' Boards  
of Trustees. 
 
	FIL, FMR Corp., through its control of Fidelity, and FASST each has sole  
power to vote and to dispose of the 1,900 American Depositary Receipts held by  
FASST. 
 
	Fidelity Management Trust Company, 82 Devonshire Street, Boston,  
Massachusetts 02109, a wholly-owned subsidiary of FMR Corp. and a bank as  
defined in Section 3(a)(6) of the Securities Exchange Act of 1934, is the  
beneficial owner of 47,900 American Depositary Receipts or 0.14% of the  
American Depositary Receipts outstanding of the Company as a result of its  
serving as investment manager of the institutional account(s).   
 
	Edward C. Johnson 3d and FMR Corp., through its control of Fidelity  
Management Trust Company, each has sole voting and dispositive power over  
47,900 American Depositary Receipts American Depositary Receipts owned by the  
institutional account(s) as reported above. 
 
	Members of the Edward C. Johnson 3d family and trusts for their benefit  
are the predominant owners of Class B shares of common stock of FMR Corp.,  
representing approximately 49% of the voting power of FMR Corp.  Mr. Johnson  
3d owns 12.0% and Abigail Johnson owns 24.5% of the aggregate outstanding  
voting stock of FMR Corp.  Mr. Johnson 3d is Chairman of FMR Corp. and Abigail  
P. Johnson is a Director of FMR Corp.  The Johnson family group and all other  
Class B shareholders have entered into a shareholders' voting agreement under  
which all Class B shares will be voted in accordance with the majority vote of  
Class B shares.  Accordingly, through their ownership of voting common stock  
and the execution of the shareholders' voting agreement, members of the  
Johnson family may be deemed, under the Investment Company Act of 1940, to  
form a controlling group with respect to FMR Corp.   
 
	Fidelity International Limited, Pembroke Hall, 42 Crowlane, Hamilton,  
Bermuda, and various foreign-based subsidiaries provide investment advisory  
and management services to a number of non-U.S. investment companies (the  
"International Funds") and certain institutional investors.  Fidelity  
International Limited is the beneficial owner of 7,100 American Depositary  
Receipts or 0.02% of the American Depositary Receipts outstanding of the  
Company, which includes 1,900 shares or 0.01% of the American Depositary  
Receipts outstanding of the Company owned by FASST.  Additional information  
with respect to the beneficial ownership of Fidelity International Limited is  
shown on Exhibit B, page 9. 
 
 
SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS 
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b) 
 
 
	Pursuant to instructions in Item 7 of Schedule 13G, this Exhibit has been  
prepared  to identify Fidelity International Limited, Pembroke Hall, 42 Crow  
Lane, Hamilton, Bermuda, a Bermudan joint stock company incorporated for an  
unlimited duration by private act of the Bermuda Legislature (FIL) and an  
investment adviser to various investment companies (the "International Funds")  
and certain institutional investors, as a beneficial owner of the 7,100  
American Depositary Receipts or 0.02% of the American Depositary Receipts  
outstanding of Saville Systems plc, which includes 1,900 shares or 0.01% of  
the American Depositary Receipts outstanding of the Company owned by FASST. 
 
	Prior to June 30, 1980, FIL was a majority-owned subsidiary of Fidelity  
Management & Research Company (Fidelity), a wholly-owned subsidiary of FMR  
Corp.  On that date, the shares of FIL held by Fidelity were distributed, as a  
dividend,  to the shareholders of FMR Corp.  FIL currently operates as an  
entity independent of FMR Corp. and Fidelity.  The International Funds and  
FIL's other clients, with the exception of Fidelity and an affiliated company  
of Fidelity, are non-U.S. entities. 
 
	A partnership controlled by Edward C. Johnson 3d and members of his  
family owns shares of FIL voting stock with the right to cast approximately  
39.89% of the total votes which may be cast by all holders of FIL voting  
stock.  Mr. Johnson 3d is Chairman of FMR Corp. and FIL.  FMR Corp. and FIL  
are separate and independent corporate entities, and their Boards of Directors  
are generally composed of different individuals.  Other than when one serves  
as a sub adviser to the other, their investment decisions are made  
independently, and their clients are generally different organizations. 
 
	FMR Corp. and FIL are of the view that they are not acting as a "group"  
for purposes of Section 13(d) under the Securities Exchange Act of 1934 (the  
"1934" Act) and that they are not otherwise required to attribute to each  
other the "beneficial ownership" of securities "beneficially owned" by the  
other corporation within the meaning of Rule 13d-3 promulgated under the 1934  
Act.  Therefore, they are of the view that the American Depositary Receipts  
held by the other corporation need not be aggregated for purposes of Section  
13(d). However, FMR Corp. is making this filing on a voluntary basis as if all  
of the American Depositary Receipts are beneficially owned by FMR Corp. and  
FIL on a joint basis. 
 
	FIL may continue to have the International Funds or other accounts  
purchase American Depositary Receipts subject to a number of factors,  
including, among others, the availability of American Depositary Receipts for  
sale at what FIL considers to be reasonable prices and other investment  
opportunities that may be available to the International Funds. 
 
	FIL intends to review continuously the equity position of the  
International Funds and other accounts in the Company.  Depending upon its  
future evaluations of the business and prospects of the Company and upon other  
developments, including, but not limited to, general economic and business  
conditions and money market and stock market conditions, FIL may determine to  
cease making additional purchases of American Depositary Receipts or to  
increase or decrease the equity interest in the Company by acquiring  
additional American Depositary Receipts, or by disposing of all or a portion  
of the American Depositary Receipts. 
 
	FIL does not have a present plan or proposal which relates to or would  
result in (i) an extraordinary corporate transaction, such as a merger,  
reorganization, liquidation, or sale or transfer of a material amount of  
assets involving the Company or any of its subsidiaries, (ii) any change in  
the Company's present Board of Directors or management, (iii) any material  
changes in the Company's present capitalization or dividend policy or any  
other material change in the Company's business or corporate structure, (iv)  
any change in the Company's charter or by-laws, or (v) the Company's common  
stock becoming eligible for termination of its registration pursuant to  
Section 12(g)(4) of the 1934 Act. 
 
	FIL has the sole power to vote and the sole power to dispose of 5,200  
shares.  FIL, FMR Corp., through its control of Fidelity, and FASST each has  
sole power to vote and to dispose of the 1,900 American Depositary Receipts  
held by FASST.   
 
 
SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS 
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b) 
RULE 13d-1(f)(1)  AGREEMENT 
 
	The undersigned persons, on March 10, 1998, agree and consent to the  
joint filing on their behalf of this Schedule 13G in connection with their  
beneficial ownership of the American Depositary Receipts of Saville Systems  
plc at February 28, 1998. 
	FMR Corp. 
	By	/s/Eric D. Roiter 
Eric D. Roiter 
Duly authorized under Power of  
Attorney 
dated December 30, 1997, by  
and on behalf 
of FMR Corp. and its direct  
and indirect subsidiaries 
	Edward C. Johnson 3d 
	By	/s/Eric D. Roiter 
Eric D. Roiter 
Duly authorized under Power of  
Attorney 
dated December 30, 1997, by  
and on behalf 
of Edward C. Johnson 3d 
	Abigail P. Johnson 
	By	/s/Eric D. Roiter 
Eric D. Roiter 
Duly authorized under Power of  
Attorney 
dated December 30, 1997, by  
and on behalf 
of Abigail P. Johnson 
	Fidelity Management & Research Company 
	By	/s/Eric D. Roiter 
Eric D. Roiter 
V.P. and General Counsel 
 
 


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