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DDN MGT Bulletin 26                         DCA DDN Program Mgt Office   
30 Jan 85                            Published by: Network Info Center
Supersedes DDN MGT Bulletin 25           (NIC@SRI-NIC)  (415) 859-3695


                      DEFENSE  DATA  NETWORK

                       MANAGEMENT  BULLETIN


THE DDN MANAGEMENT BULLETIN IS DISTRIBUTED BY THE  NETWORK INFORMATION
CENTER UNDER DCA CONTRACT AS A MEANS OF COMMUNICATING OFFICIAL POLICY,
PROCEDURES AND OTHER INFORMATION OF CONCERN TO MANAGEMENT PERSONNEL AT
DDN FACILITIES.  BACK ISSUES MAY BE OBTAINED BY FTP FROM THE DIRECTORY
<DDN-NEWS> AT  SRI-NIC  [26.0.0.73 AND 10.0.0.51]  USING  THE FILENAME
DDN-NEWS:DDN-MGT-BULLETIN-XX.TXT   (WHERE XX  IS THE BULLETIN NUMBER.)
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                     MANAGEMENT OF DDN TACS


1.  IN ORDER TO PROVIDE FOR CONFIGURATION MANAGEMENT OF THE DEFENSE
    DATA NETWORK (DDN) TERMINAL ACCESS CONTROLLERS (TACS), AS WELL
    AS IDENTIFY/JUSTIFY THE CURRENT CONNECTIONS TO THE TACS, THE 
    FOLLOWING POLICY INFORMATION AND PROCEDURES HAVE BEEN ESTABLISHED.

    A.  APPLICABILITY.

This management bulletin pertains to DDN Node Sites having one or more
TACs and all commands/organizations supporting those Node Sites, the
associated Node Site Coordinators (NSC) and all commands, agencies,
and organizations desiring full period terminations on DDN TACs.

    B.  BACKGROUND.

Effective with the establishment of the DDN on 4 April 1983, all DDN
TACs became an integral part of the network backbone and as such are
managed and controlled by the DDN PMO.  Deriving from this, several
changes in TAC management have occurred.  As used herein, DDN
encompasses the MILNET, MINET, and ARPANET.

    C.  OBJECTIVES.

Two major objectives of this management shift are: (1) To provide
centralized TAC port allocation; and (2) To provide adequate common
user dial access at all TACs.  To reach objective 1 and facilitate
future port allocation processing a separate project is currently
on-going to standardize all TAC configurations by type port (full
period/dial-up) and physical/logical sequence.  Additionally, and to
ensure objective 2 is accomplished, the following policy and
procedures are provided for action.

    D.  TAC PORT ALLOCATION AND MANAGEMENT.

Since allocation of all ports is now centrally controlled by DCA,
under no circumstances should site personnel (specifically the NSC)
make changes or allow changes to be made to any DDN TAC without
specific DCA authorization.  This policy pertains to both IMP side and
terminal side physical connections (full period terminations) to the
TAC.

    E.  REQUESTS FOR TERMINATION TO A DDN TAC.

All requests for a full period termination to a TAC must be processed
by means of a Request for Service (RFS) and Feeder TSR in accordance
with DCA Circular 310-130-1. No requests will be considered which do
not comply with this procedure. DCA reserves the right to disallow a
request for full period lines in those cases where the requirement can
be met by common user dial access.  ARPANET users should submit
requirements through their sponsor.

    F.  JUSTIFICATION OF EXISTING FULL PERIOD SERVICE.

MILNET - Effective as of 1 May 1985, all existing full period TAC
terminations must be justified by means of a Request for Service to
your TCO, which in turn will submit a Feeder TSR to the DDN PMO.  This
requirement will be in accordance with DCAC 310-130-1 and will use the
same format as a new start requirement listed in the circular with the
following exceptions: Item number 116 must have the present
communications service authorization (CSA) number associated with the
requirement that is being requested to be assumed by the DDN PMO; item
number 407A and 407B must have the present equipment (Cables, modems,
cabinets) by name and type that is being paid under this CSA number;
item number 416 must reflect the monthly bill total presently being
paid and the name and location of the business sales and service
center (BSSC) that the bill is being paid to. Item number 417
(remarks) of the TSR format to indicate that the RFS/Feeder TSR is for
continuation of service: also include the TAC logical port number in
octal of the full period termination to permit ready identification.
(If a RFS/Feeder TSR has been previously submitted, provide TSR number
and date.  Also, include TAC logical port number in octal.) 

Item number 420 must be filled out if toll charges are part of the
requirement.  If all of the above information are not provided in the
feeder TSR, the DDN PMO will not be able to pickup the charges
associated with this requirement, providing this action has not been
previously accomplished.  Upon completion of this effort, all
authorized TAC ports currently in use will have been identified and
justified.  All termination not identified and justified IAW this
procedure will be disconnected at the TAC effective 15 May 1985.

ARPANET - Submission of RFS/Feeder TSRs does not apply to the
ARPANET.  The DDN PMO will provide a current listing of ARPANET TACs
and their associated logical port assignments in octal to DARPA for
revalidation.  All ports, except those validated by DARPA, will be
disconnected at the TAC.

    G.  COMMON-USER DIAL-ACCESS EXPANSION.

A project is underway to expand the number of TACs and associated
Common-User access dial ports on the MILNET.  TAC installations are
scheduled at every new IMP site, with approximately 90 new TACs to be
added by mid 1986.  In addition, the user registration data base at
the DDN NIC is frequently analyzed to determine additional
requirements for TAC installations.  A minimum of 16 dial ports are
being installed on every MILNET TAC, where the ports are available and
the site's telephone cable plant can support the additional lines. All
of the new modems will be capable of operating at either 300 or 1200
baud.  The phone numbers for these ports will be added to the file
accessible via the TACNEWS Server (the @n command at TACs) as soon as
they are available.  They will also be included in the appropriate
edition of a hardcopy TAC Telephone Directory to be published by the
NIC in 1985.

    H.  PUBLICATION OF TAC DIAL-UP PHONE NUMBERS.

The phone numbers for all existing MILNET and ARPANET TAC dial ports
will be published by DCA for common-user access.  This paragraph
applies only to dial ports which are common-user full period
terminations to TACs and specifically does not apply to dial ports
which are connected to port selectors, or expanders for which the
service was justified by the using command as full period terminations
and not for common-user access.  The Node Site Coordinators (NSC) or
supporting commands for those MILNET sites where billing for
common-user dial-up lines has not been transferred to DCA shall submit
feeder TSR information immediately in accordance with DCA Circular
310-130-1, in order to transfer billing responsibility to DCA. The
information outlined in paragraph 1F must be included in the feeder
TSR to enable DECCO to change the billing.

    I.  TAC INVENTORY REPORT ELIMINATED.

Effective immediately, the quarterly TAC Inventory Report is no longer
required.

2.  These procedures have been distributed as an AUTODIN message DTG
    211531Z Nov 84 via official channels to the appropriate
    commands/agencies.

3. Your assistance in implementing the DDN TAC Configuration Management
   will be appreciated.
 

Note: To obtain a copy of DCA Circular 310-130-1, contact:

DCA
Code 316
Washington, D.C. 20305-2000

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