# Title 47

## SECTION 4.7

### 4.7 Definitions of metrics used to determine the general outage-reporting threshold criteria.

§ 4.7 Definitions of metrics used to determine the general outage-reporting threshold criteria.(a) *Administrative numbers* are defined as the telephone
numbers used by communications providers to perform internal
administrative or operational functions necessary to maintain
reasonable quality of service standards.

(b) *Assigned numbers* are defined as the telephone numbers
working in the Public Switched Telephone Network under an agreement
such as a contract or tariff at the request of specific end users
or customers for their use. This excludes numbers that are not yet
working but have a service order pending.

(c) *Assigned telephone number* minutes are defined as the
mathematical result of multiplying the duration of an outage,
expressed in minutes, by the sum of the number of assigned numbers
(defined in paragraph (b) of this section) potentially affected by
the outage and the number of administrative numbers (defined in
paragraph (a) of this section) potentially affected by the outage.
“Assigned telephone number minutes” can alternatively be calculated
as the mathematical result of multiplying the duration of an
outage, expressed in minutes, by the number of working telephone
numbers potentially affected by the outage, where working telephone
numbers are defined as the telephone numbers, including DID
numbers, working immediately prior to the outage.

(d) *Optical Carrier 3 (OC3) minutes* are defined as the
mathematical result of multiplying the duration of an outage,
expressed in minutes, by the number of previously operating OC3
circuits or their equivalents that were affected by the outage.

(e) *User minutes* are defined as:

(1) Assigned telephone number minutes (as defined in paragraph (c) of this section), for telephony, including non-mobile interconnected VoIP telephony, and for those paging networks in which each individual user is assigned a telephone number;

(2) The mathematical result of multiplying the duration of an outage, expressed in minutes, by the number of end users potentially affected by the outage, for all other forms of communications. For interconnected VoIP service providers to mobile users, the number of potentially affected users should be determined by multiplying the simultaneous call capacity of the affected equipment by a concentration ratio of 8.

(f) *Working telephone numbers* are defined to be the sum
of all telephone numbers that can originate, or terminate
telecommunications. This includes, for example, all working
telephone numbers on the customer's side of a PBX, or Centrex, or
similar arrangement.