As the number of ONA services increases along with the
complexity of these services, the potential
for vulnerabilities associated with ONA
services also increases. Although there are over 100
ONA services, all of which have the potential to impact NS/EP
in some form (e.g., if an ONA service contains vulnerabilities, exploitation
of the vulnerabilities may affect the availability and reliability of the PSN),
this section will describe a few ONA services of particular concern to
NS/EP.
The following list describes OSS ONA services as they are
described in
the July 1994 ``ONA Services User Guide.'' The services are grouped
according to the four categories considered by the FCC to be
basic OSS services. Services are listed according to their generic ONA
service name. As noted in section 
,
in providing ESP access to OAM& systems, safeguards must be
maintained by the carriers to prevent inadvertent errors, or harm to
the network and OAM& databases by the accessing party. Vulnerabilities
associated with ONA services that support OAM& functions have the potential
to affect the availability and reliability of the PSN.
Some of the services
listed below support NS/EP by providing a way to monitor and respond to
problems in the PSN.
This service will offer the ESPs a common, mechanized presentation system for access to Network Management products, such as network reconfiguration, while also providing ESP customer access to internal operations support systems for additional information and control of their network.
This service will provide a secure and user friendly interface to ESP customers in providing capabilities and support in some or all of the following areas of service management: (1) Administration, (2) Security, (3) Performance, (4) Fault Management, (5) Reconfiguration, and (6) Accounting.
This capability will allow ESPs to provide basic ordering information to the business office through a mechanized interface.
This capability will allow ESPs to electronically report and check the status of local and access, circuit line troubles into support systems.
This capability provides ESPs with periodic printed summaries of traffic data on their network facilities that are associated with central office switches. Traffic data reports include traffic information such as number of call attempts, number of blocked calls, and usage by ESP trunk group.
The dedicated alert transport Basic Serving Arrangement using derived local channel technology would offer ESPs a 24 hour supervised monitoring capability using existing local loop access lines.
This capability allows an ESP to be signaled by central office equipment every 60 seconds or less to report on the integrity of the ESP's client's lines that are being monitored for breaks.
This feature provides ESPs flexibility in managing and reconfiguring their dedicated facilities.
The product currently available for this ONA Service supports network reconfiguration.
The following is a list of a few ONA services that are not OSS services, but are of interest to NS/EP. The following list describes ONA services as they are described in the July 1993 ``ONA Services User Guide.'' These services are categorized by their generic ONA service name. While vulnerabilities associated with the services listed below have the capability to negatively impact NS/EP, these services can support the availability of the PSN.
When all the circuits in an ESP's circuit switched trunk serving arrangement with alternate route capability are busy due to traffic volume the network will attempt to complete subsequent calls to an alternate route served by that switch as previously specified by the ESP.
Automatic Protection Switching provides the ability to monitor a non-switched facility between the ESP premises and the wire center serving the premises and to automatically switch to a spare facility if the performance of the original facility degrades or fails.
Route Diversity provides an increased safety factor for ESP facilities that could be subject to disruption from cable cuts and other unavoidable catastrophes. It provides for diverse routing when necessary in order to comply with special ESP requirements.