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INTERNET-DRAFT EXPIRES: AUGUST 1997 INTERNET-DRAFT
Network Working Group S. Sheppard
Internet-Draft S. Peoples
Category: Standards Track Media Solutions International, Inc.
January 1997
Electronic Part Catalog to Business System Interface
<draft-rfced-info-sheppard-00.txt>
Status of this Memo
This document is an Internet-Draft. Internet-Drafts are working
documents of the Internet Engineering task Force (IETF), its areas,
and its working groups. Note that other groups may also distribute
working documents as Internet-Drafts.
Internet-Drafts are draft documents valid for a maximum of six
months and may be updated, replaced, or obsoleted by other
documents at any time. It is inappropriate to use Internet-Drafts
as reference material or to cite them other than as "work in progress".
To learn the current status of any Internet-Draft, please check the
"1id-abstract.txt" listing contained in the Internet-Drafts Shadow
Directories on ftp.is.co.za (Africa), nic.nordu.net (Europe),
munnari.oz.au (Pacific Rim), ds.internic.net (US East Coast), or
ftp.isi.edu (US West Coast).
Abstract
This Internet-Draft specifies a standard method of transferring
part and pick list information between dealer business systems
(DBS) and electronics parts catalog (EPC) systems.
Table of Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2 Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . 2
3 Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4 Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4.1 Part Queries . . . . . . . . . . . . . . . . . . . . . . . . . 4
4.2 Pick Lists . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Mass Updates . . . . . . . . . . . . . . . . . . . . . . . . . . 6
6 Security Considerations of this Memo . . . . . . . . . . . . . . 6
7 Summary of tables and fields . . . . . . . . . . . . . . . . . . 7
7.1 Any These fields may appear in any of the files . . . . . . 7
7.2 C Comments . . . . . . . . . . . . . . . . . . . . . . . . 8
7.3 D Pick List Details . . . . . . . . . . . . . . . . . . . 8
7.4 H Pick List Header . . . . . . . . . . . . . . . . . . . . 8
7.5 P Parts . . . . . . . . . . . . . . . . . . . . . . . . . 9
7.6 S Stocked Part . . . . . . . . . . . . . . . . . . . . . 10
7.7 T Price Tape . . . . . . . . . . . . . . . . . . . . . . 11
8 References . . . . . . . . . . . . . . . . . . . . . . . . . . 11
9 Author's Addresses . . . . . . . . . . . . . . . . . . . . . . 11
Appendix - Country Codes from ISO 3166 . . . . . . . . . . . . . . . 12
Sheppard [Page 1]
Internet-Draft EPC to DBS Interface January 1997
1 Introduction
An EPC is used to electronically retrieve the information contained
within the printed parts books. This is usually accomplished
with a highly graphical interface. In addition, most EPCs run
on Windows-based PC's. The EPC is only a lookup/ reference
tool, but it does allow for the creation of "pick lists". A pick
list places a number of part numbers along with the corresponding
quantities requested into a list.
A DBS is used to catalog the Part Numbers available at an Equipment
Dealer/ Distributor's location. Typical systems allow for the entry
of Part Numbers, Quantity on Hand, Quantity on Order, Bin Location,
Retail Price, Customer Price, Suggested Retail Price, etc... These
systems typically run on Unix based mainframes.
With the rising use of EPCs in the outdoor power, agricultural,
and construction equipment industries the need to share data in
real-time with the legacy DBSs has become a key issue
to successfully installing these systems. A number of
proprietary, operating system specific, and inflexible
protocols have been proposed to handle these interactions.
It is the intent of this Internet-Draft to describe an interface
which has been successfully implemented that overcomes the
limitations of previous interfaces.
2 Key Features
The key features of this interface are as follows:
- expand-ability The framework is expansion-friendly
- network independent Although tcp/ip is the only
protocol currently used to implement this interface
there other protocols that share TCP's key features
such as ISO 8072 could be used instead.
- client-server
- decoupling The DBS and the EPC can each be upgraded
without requiring a simultaneous upgrade in the other. This
is particularly important in environments with EPC's from
several vendors being used simultaneously.
- operating system independent
- real-time The user always sees the most current
information.
Sheppard [Page 2]
Internet-Draft EPC to DBS Interface January 1997
3 Protocol
The protocol is very simple. Data is transferred in both
directions using the same format. Each line in the transfer
is split up into four pieces.
The first character is the `table'. Some might feel more
comfortable referring to this as the `file' or `database',
but since table is a less ambiguous term that is what this
I-D will use. Examples of tables would be the part, stock
part, pick list header, and pick list detail. Each of these
has a unique character. The capitalization of this character
is also significant. It is used to indicate the beginning of
records. If the table character is a capital, that indicates
the beginning of a record. If it is lower case, then it is a
continuation of the current record. If the table is `#' then
the rest of the line is ignored and is a comment. These
comments are not intended to be displayed to the user. They
are there merely to facilitate the debugging process.
The second character is the `field'. Within each table
characters are defined for individual fields such as
`manufacturer', `part number', and `description'. Again, the
capitalization of the characters is relevant. If a field is
a capital letter it indicates information that is known. If
it is lower case it indicates information that is being
requested. The `*' character can be used to request all
available information. Although no one has currently
implemented it, it is possible for this character to be used
to delete or count matching records.
The third piece is simply a space (ASCII 32).
The fourth piece consumes the rest of the line. It is the
`value'. Monetary values are expressed in pennies. $123.45
would be passed as `12345'. The line should be terminated
with a UNIX (LF) or DOS (CR/LF) line terminator. There
should be no white space between the end of the value and the
line terminator. If there is, it should be ignored. White
space includes space, tab and other control characters. For
purposes of this I-D ASCII 1-32 except LF should be
considered white space.
One particularly important point of this interface is the
decoupling of the EPC and DBS. To achieve this version
numbers are used. As long as the major number hasn't
changed, both ends should cope gracefully with new tables and
fields. The EPC or the DBS may have fields which the other
does not. That these fields might be sent should not crash
the interface, or cause the user to see an error message.
The current version number is 2.1.
Sheppard [Page 3]
Internet-Draft EPC to DBS Interface January 1997
In the tcp/ip realm it has become common practice for the DBS
to accept connections on port 2345. Many clients also rely on
resolving `bsihost' to the IP address of the server.
Also the system information passed in the `$' table should be
the first thing sent. The client should send in the order
`H' then `V' then the other optional `$' fields. The server
should start with a `V' that is the same major number as the
client. The other `$' fields should not be passed since they
would be superfluous.
The client and server should both finish by sending a final
line of `QUIT' or `DONE'. While `DONE' may still be in use,
`QUIT' is preferred since it is more consistent with other
tcp/ip protocols. Version 2 clients and servers should
support both, but Version 3 and greater clients and servers
should support and send only `QUIT'.
Appendix A lists the currently defined tables and fields.
4 Examples
These examples are provided to help make the protocol easier
to understand.
4.1 Part Queries
The EPC might send the following to the DBS:
$H N-Compass
$V 2.1
$U tom
SE XYZ
sI 12345
s*
QUIT
In this case 'tom' is on 'N-Compass' running a version 2.1 EPC
and is requesting information on part
12345 from manufacturer XYZ.
The DBS might respond with
$V 2.1
QUIT
This would indicate that no information is available. Its
likely that the DBS does not have that part on file.
The DBS could have responded with:
Sheppard [Page 4]
Internet-Draft EPC to DBS Interface January 1997
$V 2.1
SE XYZ
sI 12345
sB top shelf
sC 123
sO 2
sQ 550
sD what-cha-ma-jig
QUIT
This indicates that the EPC should display the information to
the user. The DBS also might have responded with
$V 2.1
SE XYZ
sI 12345
sB top shelf
sC 123
sO 2
sQ 550
sD what-cha-ma-jig
sA don't sell this without grease and instructions
sA Bob knows how to install this
QUIT
In this case, the dealer or the manufacturer have added
comments for this part. If possible this information should
be displayed to the user in the EPC.
Another example of a query from the EPC is
$H N-Compass
$V 2.1
$U tom
TE XYZ
tI 12345
tD What-Cha-Ma-Jiggy
tZ US
tC 123
tS 456
t*
SE XYZ
sI 12345
s*
QUIT
In this case the EPC knows information about the part that is
relevant in the US. The DBS should store this information
and use it to compute markups (actual customer prices are
calculated).
Sheppard [Page 5]
Internet-Draft EPC to DBS Interface January 1997
4.2 Pick Lists
An example of a simple pick list sent from the EPC would be:
$H N-Compass
$V 2.1
$U tom
HI 1
hN sale for maury
hS S
DH 1
dI 1
dQ 2
dM XYZ
dP 12345
DH 1
dI 2
dQ 4
dM XYZ
dP 67890
QUIT
In this case two parts are to be invoiced. The first part is
quantity 2 of manufacturer `XYZ' part `12345'. The second
part is quantity 4 of manufacturer `XYZ' part `67890'.
5 Mass Updates
Support for this feature is not necessarily available on all
current implementations. If the user would like to have the
DBS updated with information from the EPC, they should be
able to start a mass update. The mass update would include
the normal $H and $V information. Then T records would be
passed.
6 Security Considerations of this Memo
Most vendors involved have not been concerned about security
and all current implementations make few if any security
checks. The host and user information included in the
information from the client is assumed by most servers to be
correct. While on a small private network this may or may
not be acceptable, something such as SSL or PGP should be
used in Internet environments.
Sheppard [Page 6]
Internet-Draft EPC to DBS Interface January 1997
7 Summary of tables and fields
Table Field Description
# Comments This line should be ignored. Use of
comments for debugging purposes is
recommended.
$ B Branch. A query option. This is
not required
$ C Customer Number. A query option.
This is not required
$ H Hostname. The $H line must be
the first line the EPC sends to the DBS.
The hostname need not be sent by the DBS
to the EPC.
$ O Order Type. A query option. This
is not required.
$ S Source Type. A query option. This
will either be C for Counter, M for
Machine or W for Work Order. This is not
required.
$ U Username. A query option. This is not
required.
$ V Version. This is a floating point
number. There will never be a
"version 4.5.3" or "version 2.1.2.12.9.5".
For this release the version "2.1".
Sending it is required and it must be the
second record sent by the EPC and the
first record sent by the DBS.
7.1 Any These fields may appear in any of the files
Any - Record is to be deleted. This is not
currently supported by most
implementations
Any * Query for all fields
Any # Query for count. This is not currently
supported by most implementations
Sheppard [Page 7]
Internet-Draft EPC to DBS Interface January 1997
7.2 C Comments
C A Comment
C E Equipment Manufacturer. (OEM)
C I Part Number, Primary. The E and I
fields make up the compound primary key
for a Part.
7.3 D Pick List Details
D C Cost.
D H Header Identifier. This value must
match an "HI" value transferred as part
of a previous "Pick List Header".
D I Identifier. The H and I fields make
up the compound primary key for a Pick
List Detail.
D M Manufacturer Code.
D P Part Number.
D Q Quantity.
D S Status. R for Receiving or Returning.
7.4 H Pick List Header
H I Identifier. This is the unique key
for Pick List Headers. It should be
unique across transactions
H N Name. A descriptive name for the entire
pick list
H S Status. S for Sale, P for Purchase, M
for Miscellaneous.
Sheppard [Page 8]
Internet-Draft EPC to DBS Interface January 1997
7.5 P Parts
P C Cost. (in cents)
P D Description.
P E Equipment Manufacturer. (OEM)
P F Reserved. This varies depending on the
manufacturer.
P G Reserved. This varies depending on the
manufacturer.
P I Part Number, Primary. E and I form
the compound primary key for a Part.
P J Part Number, Secondary.
P L Local Purchase. Y or N. If N, the part
is not available from the manufacturer.
P R Remarks. Part Notes
P S Suggested Retail Price. (in cents)
P U Unit. The units by which something is
sold. E.g., "Carton", "Set", etc.
P W W Weight. In hundredths of a
pound.
P Y New Part Numbers / Superseded By /
Superseder (repeatable)
P Z Old Part Numbers / Supersedes /
Supercedee (repeatable)
Sheppard [Page 9]
Internet-Draft EPC to DBS Interface January 1997
7.6 S Stocked Part
S A Comment. Other information added my
the manufacturer or user. The DBS may
also manufacture other textual
information and place it in a comment.
S B Bin. The location of the item at the
dealership.
S C Dealer Cost. Money is in cents.
S D Description.
S E Equipment Manufacturer. (OEM)
S F Reserved. This varies depending on the
manufacturer.
S G Reserved. This varies depending on the
manufacturer.
S I Identifier. E and I form the
compound primary key for a Stock Part.
S M Minimum.
S O On Hand.
S P Customer Price. (in cents)
S Q Customer Price, Secondary. (in
cents)
S R Reserved Quantity.
S S Suggested Retail Price. (in cents)
S U Supersession.
S Y Quantity Sold in Year To Date.
S Z Quantity On Order.
Sheppard [Page 10]
Internet-Draft EPC to DBS Interface January 1997
7.7 T Price Tape
T C Dealer Cost. (in cents)
T D Description.
T E Equipment Manufacturer. (OEM)
T F Reserved. This varies depending on the
manufacturer.
T G Reserved. This varies depending on the
manufacturer.
T I Identifier. E and I form the
compound primary key for a Stock Part.
T S Suggested Retail Price. (in cents)
T Z ISO 3166 Country Code for this
combination. The country code means that
cost and SRP are in the currency of that
country (US dollars, CN dollars, etc.).
The description may also be in the
primary language of that country. See appendix
for a list of these country codes.
8 References
[1] Postel. J., "Transmission Control Protocol.", STD 7,
RFC 793, USC/Information Sciences Institute, September 1981.
[2] P. Mockapetris, "Domain Names - Concepts and Facilities",
USC/Information Sciences Institute, November 1987
9 Author's Addresses
Scott Sheppard
Media Solutions International, Inc.
430 Tenth Street NW Suite N-210
Atlanta, Georgia 30318
Phone: (404)892-1268 Ext. 314 Fax: (404)892-1928
E-Mail: pinky@mindspring.com
Sean Peoples
Media Solutions International, Inc.
430 Tenth Street NW Suite N-210
Atlanta, Georgia 30318
Phone: (404)892-1268 Ext. 302 Fax: (404)892-1928
E-Mail: seanp@mindspring.com
Sheppard [Page 11]
Internet-Draft EPC to DBS Interface January 1997
Appendix - Country Codes from ISO 3166
Updated by the RIPE Network Coordination Centre.
Source: ISO 3166 Maintenance Agency
Latest change: Tue Jan 7 15:57:16 MET 1997
Country A 2 A 3 Number
-------------------------------------------------------------------
AFGHANISTAN AF AFG 004
ALBANIA AL ALB 008
ALGERIA DZ DZA 012
AMERICAN SAMOA AS ASM 016
ANDORRA AD AND 020
ANGOLA AO AGO 024
ANGUILLA AI AIA 660
ANTARCTICA AQ ATA 010
ANTIGUA AND BARBUDA AG ATG 028
ARGENTINA AR ARG 032
ARMENIA AM ARM 051
ARUBA AW ABW 533
AUSTRALIA AU AUS 036
AUSTRIA AT AUT 040
AZERBAIJAN AZ AZE 031
BAHAMAS BS BHS 044
BAHRAIN BH BHR 048
BANGLADESH BD BGD 050
BARBADOS BB BRB 052
BELARUS BY BLR 112
BELGIUM BE BEL 056
BELIZE BZ BLZ 084
BENIN BJ BEN 204
BERMUDA BM BMU 060
BHUTAN BT BTN 064
BOLIVIA BO BOL 068
BOSNIA AND HERZEGOWINA BA BIH 070
BOTSWANA BW BWA 072
BOUVET ISLAND BV BVT 074
BRAZIL BR BRA 076
BRITISH INDIAN OCEAN TERRITORY IO IOT 086
BRUNEI DARUSSALAM BN BRN 096
BULGARIA BG BGR 100
BURKINA FASO BF BFA 854
BURUNDI BI BDI 108
CAMBODIA KH KHM 116
CAMEROON CM CMR 120
CANADA CA CAN 124
CAPE VERDE CV CPV 132
CAYMAN ISLANDS KY CYM 136
CENTRAL AFRICAN REPUBLIC CF CAF 140
CHAD TD TCD 148
CHILE CL CHL 152
CHINA CN CHN 156
CHRISTMAS ISLAND CX CXR 162
COCOS (KEELING) ISLANDS CC CCK 166
Sheppard [Page 12]
Internet-Draft EPC to DBS Interface January 1997
Country A 2 A 3 Number
-------------------------------------------------------------------
COLOMBIA CO COL 170
COMOROS KM COM 174
CONGO CG COG 178
COOK ISLANDS CK COK 184
COSTA RICA CR CRI 188
COTE D'IVOIRE CI CIV 384
CROATIA (local name: Hrvatska) HR HRV 191
CUBA CU CUB 192
CYPRUS CY CYP 196
CZECH REPUBLIC CZ CZE 203
DENMARK DK DNK 208
DJIBOUTI DJ DJI 262
DOMINICA DM DMA 212
DOMINICAN REPUBLIC DO DOM 214
EAST TIMOR TP TMP 626
ECUADOR EC ECU 218
EGYPT EG EGY 818
EL SALVADOR SV SLV 222
EQUATORIAL GUINEA GQ GNQ 226
ERITREA ER ERI 232
ESTONIA EE EST 233
ETHIOPIA ET ETH 231
FALKLAND ISLANDS (MALVINAS) FK FLK 238
FAROE ISLANDS FO FRO 234
FIJI FJ FJI 242
FINLAND FI FIN 246
FRANCE FR FRA 250
FRANCE, METROPOLITAN FX FXX 249
FRENCH GUIANA GF GUF 254
FRENCH POLYNESIA PF PYF 258
FRENCH SOUTHERN TERRITORIES TF ATF 260
GABON GA GAB 266
GAMBIA GM GMB 270
GEORGIA GE GEO 268
GERMANY DE DEU 276
GHANA GH GHA 288
GIBRALTAR GI GIB 292
GREECE GR GRC 300
GREENLAND GL GRL 304
GRENADA GD GRD 308
GUADELOUPE GP GLP 312
GUAM GU GUM 316
GUATEMALA GT GTM 320
GUINEA GN GIN 324
GUINEA-BISSAU GW GNB 624
GUYANA GY GUY 328
HAITI HT HTI 332
HEARD AND MC DONALD ISLANDS HM HMD 334
HOLY SEE (VATICAN CITY STATE) VA VAT 336
HONDURAS HN HND 340
Sheppard [Page 13]
Internet-Draft EPC to DBS Interface January 1997
Country A 2 A 3 Number
-------------------------------------------------------------------
HONG KONG HK HKG 344
HUNGARY HU HUN 348
ICELAND IS ISL 352
INDIA IN IND 356
INDONESIA ID IDN 360
IRAN (ISLAMIC REPUBLIC OF) IR IRN 364
IRAQ IQ IRQ 368
IRELAND IE IRL 372
ISRAEL IL ISR 376
ITALY IT ITA 380
JAMAICA JM JAM 388
JAPAN JP JPN 392
JORDAN JO JOR 400
KAZAKHSTAN KZ KAZ 398
KENYA KE KEN 404
KIRIBATI KI KIR 296
KOREA, DEMOCRATIC PEOPLE'S REPUBLIC OF KP PRK 408
KOREA, REPUBLIC OF KR KOR 410
KUWAIT KW KWT 414
KYRGYZSTAN KG KGZ 417
LAO PEOPLE'S DEMOCRATIC REPUBLIC LA LAO 418
LATVIA LV LVA 428
LEBANON LB LBN 422
LESOTHO LS LSO 426
LIBERIA LR LBR 430
LIBYAN ARAB JAMAHIRIYA LY LBY 434
LIECHTENSTEIN LI LIE 438
LITHUANIA LT LTU 440
LUXEMBOURG LU LUX 442
MACAU MO MAC 446
MACEDONIA, THE FORMER YUGOSLAV REPUBLIC OF MK MKD 807
MADAGASCAR MG MDG 450
MALAWI MW MWI 454
MALAYSIA MY MYS 458
MALDIVES MV MDV 462
MALI ML MLI 466
MALTA MT MLT 470
MARSHALL ISLANDS MH MHL 584
MARTINIQUE MQ MTQ 474
MAURITANIA MR MRT 478
MAURITIUS MU MUS 480
MAYOTTE YT MYT 175
MEXICO MX MEX 484
MICRONESIA, FEDERATED STATES OF FM FSM 583
MOLDOVA, REPUBLIC OF MD MDA 498
MONACO MC MCO 492
MONGOLIA MN MNG 496
MONTSERRAT MS MSR 500
MOROCCO MA MAR 504
MOZAMBIQUE MZ MOZ 508
Sheppard [Page 14]
Internet-Draft EPC to DBS Interface January 1997
Country A 2 A 3 Number
-------------------------------------------------------------------
MYANMAR MM MMR 104
NAMIBIA NA NAM 516
NAURU NR NRU 520
NEPAL NP NPL 524
NETHERLANDS NL NLD 528
NETHERLANDS ANTILLES AN ANT 530
NEW CALEDONIA NC NCL 540
NEW ZEALAND NZ NZL 554
NICARAGUA NI NIC 558
NIGER NE NER 562
NIGERIA NG NGA 566
NIUE NU NIU 570
NORFOLK ISLAND NF NFK 574
NORTHERN MARIANA ISLANDS MP MNP 580
NORWAY NO NOR 578
OMAN OM OMN 512
PAKISTAN PK PAK 586
PALAU PW PLW 585
PANAMA PA PAN 591
PAPUA NEW GUINEA PG PNG 598
PARAGUAY PY PRY 600
PERU PE PER 604
PHILIPPINES PH PHL 608
PITCAIRN PN PCN 612
POLAND PL POL 616
PORTUGAL PT PRT 620
PUERTO RICO PR PRI 630
QATAR QA QAT 634
REUNION RE REU 638
ROMANIA RO ROM 642
RUSSIAN FEDERATION RU RUS 643
RWANDA RW RWA 646
SAINT KITTS AND NEVIS KN KNA 659
SAINT LUCIA LC LCA 662
SAINT VINCENT AND THE GRENADINES VC VCT 670
SAMOA WS WSM 882
SAN MARINO SM SMR 674
SAO TOME AND PRINCIPE ST STP 678
SAUDI ARABIA SA SAU 682
SENEGAL SN SEN 686
SEYCHELLES SC SYC 690
SIERRA LEONE SL SLE 694
SINGAPORE SG SGP 702
SLOVAKIA (Slovak Republic) SK SVK 703
SLOVENIA SI SVN 705
SOLOMON ISLANDS SB SLB 090
SOMALIA SO SOM 706
SOUTH AFRICA ZA ZAF 710
SOUTH GEORGIA AND THE SOUTH SANDWICH ISLANDS GS SGS 239
SPAIN ES ESP 724
Sheppard [Page 15]
Internet-Draft EPC to DBS Interface January 1997
Country A 2 A 3 Number
-------------------------------------------------------------------
SRI LANKA LK LKA 144
ST. HELENA SH SHN 654
ST. PIERRE AND MIQUELON PM SPM 666
SUDAN SD SDN 736
SURINAME SR SUR 740
SVALBARD AND JAN MAYEN ISLANDS SJ SJM 744
SWAZILAND SZ SWZ 748
SWEDEN SE SWE 752
SWITZERLAND CH CHE 756
SYRIAN ARAB REPUBLIC SY SYR 760
TAIWAN, PROVINCE OF CHINA TW TWN 158
TAJIKISTAN TJ TJK 762
TANZANIA, UNITED REPUBLIC OF TZ TZA 834
THAILAND TH THA 764
TOGO TG TGO 768
TOKELAU TK TKL 772
TONGA TO TON 776
TRINIDAD AND TOBAGO TT TTO 780
TUNISIA TN TUN 788
TURKEY TR TUR 792
TURKMENISTAN TM TKM 795
TURKS AND CAICOS ISLANDS TC TCA 796
TUVALU TV TUV 798
UGANDA UG UGA 800
UKRAINE UA UKR 804
UNITED ARAB EMIRATES AE ARE 784
UNITED KINGDOM GB GBR 826
UNITED STATES US USA 840
UNITED STATES MINOR OUTLYING ISLANDS UM UMI 581
URUGUAY UY URY 858
UZBEKISTAN UZ UZB 860
VANUATU VU VUT 548
VENEZUELA VE VEN 862
VIET NAM VN VNM 704
VIRGIN ISLANDS (BRITISH) VG VGB 092
VIRGIN ISLANDS (U.S.) VI VIR 850
WALLIS AND FUTUNA ISLANDS WF WLF 876
WESTERN SAHARA EH ESH 732
YEMEN YE YEM 887
YUGOSLAVIA YU YUG 891
ZAIRE ZR ZAR 180
ZAMBIA ZM ZMB 894
ZIMBABWE ZW ZWE 716
Sheppard [Page 16]
INTERNET-DRAFT EXPIRES: AUGUST 1997 INTERNET-DRAFT
