Nortel Networks OPTera Metro 3500 - Manual (Page 198)

2-160 Operation, administration, and maintenance (OAM) features
OPTera Metro 3500 Multiservice Platform NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004
Test Access
The test access feature monitors and tests signal quality of cross-connects
through a test access port (TAP). This feature provides quick and reliable
confirmation of service performance, as well as isolation of trouble when
failure occurs in the network.
This feature is supported on SONET network elements.
Test access implementation complies with the latest issues of:
• GR-818-CORE, Network Maintenance: Access and Testing - Generic Test
Architecture
• GR-834-CORE, Network Maintenance: Access and Testing Messages
• GR-1402-CORE, Network Maintenance: Access And Testing - DS3
HCDS TSC/RTU and DTAU Functional Requirements
• GR-3008-CORE, Network Maintenance: Access and Testing - SONET
STS-1 and SUB-STS-1 TSC/RTU and DTAU Functional Requirements
• GR-2996-CORE, Generic Criteria for SONET Digital Cross-Connect
Systems
• GR-253-CORE, Synchronous Optical Network (SONET) Transport
Systems: Common Generic Criteria
Figure 2-52 on page 2-162 illustrates the organization of the main components
of the test access feature. The testing operations systems (TOS) sends testing
requests in the form of TL1 commands to the test access equipment through an
internal data network. The test access equipment is in the supported mode of
test controller system (TCS). In the TCS mode, the test access equipment
manages the test access session and sends TL1 commands to the network
element. Communication between the test access equipment and network
element occurs through a TCP/IP control link.
Site Manager Release 6.0 introduced a new application called “Test Access
Sessions Application” which will allow a user to fully manage their test access
sessions from Site Manager.
Figure 2-51 on page 2-161 shows the new Test
Access Sessions Management window.