C at the NODE site. The MMOC's at the NODE sites
may also be involved in the testing of NODE to Host circuits. The MMOC
will also assist on Host to PSAP and data network related troubles not
resolved through standard trouble clearing procedures.

Installation And Maintenance Center (IMC) is responsible for referral
of E911 subscriber troubles that are not subscriber line problems.

E911 Center - Performs the role of System Administration and is
responsible for overall operation of the E911 computer software. The
E911 Center does A-Z trouble analysis and provides statistical
information on the performance of the system.

This analysis includes processing PSAP inquiries (trouble reports) and
referral of network troubles. The E911 Center also performs daily
processing of tandem recent change and provides information to the
RCMAC for tandem input. The E911 Center is responsible for daily
processing of the ALI/DMS computer data base and provides error files,
etc. to the Customer Services department for investigation and
correction. The E911 Center participates in all system implementations
and on-going maintenance effort and assists in the development of
procedures, training and education of information to all groups.

Any group receiving a 911 trouble from the SSC/MAC should close out the
trouble with the SSC/MAC or provide a status if the trouble has been
referred to another group. This will allow the SSC/MAC to provide a
status back to the customer or escalate as appropriate.

Any group receiving a trouble from the Host site (MMOC or CCNC) should
close the trouble back to that group.

The MMOC should notify the appropriate SSC/MAC when the Host, Node, or
all Node circuits are down so that the SSC/MAC can reply to customer
reports that may be called in by the PSAPs. This will eliminate
duplicate reporting of troubles. On complete outages the MMOC will
follow escalation procedures for a Node after two (2) hours and for a
PSAP after four (4) hours. Additionally the MMOC will notify the
appropriate SSC/MAC when the Host, Node, or all Node circuits are down.

The PSAP will call the SSC/MAC to report E911 troubles. The person
reporting the E911 trouble may not have a circuit I.D. and will
therefore report the PSAP name and address. Many PSAP troubles are not
circuit specific. In those instances where the caller cannot provide a
circuit I.D., the SSC/MAC will be required to determine the circuit
I.D. using the