Nortel Networks OPTera Metro 3500 - Manual (Page 45)

Operation, administration, and maintenance (OAM) features 2-7
Planning and Ordering Guide—Part 1 of 2 NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004
Environmental alarms
Both the OPTera Metro 3500 and DS1 service module (DSM) support
environmental alarms. Each OPTera Metro 3500 shelf and DS1 service module
have 16 pairs of contacts that detect environmental alarms. The contacts are on
the environmental alarms connector of the left OAM (LOAM) and on the DSM
connected to the OAM power module. Set up environmental alarms during
provisioning.
The cooling fans on the OPTera Metro 3500 are detectable through pins
available from the backplane to the shelf processor. They are not connected to
an environmental alarm input for monitoring.
Alarm messages broadcast to all active user sessions.
External controls
The OPTera Metro 3500 network elements and DSM support external
controls. The external controls allow you to operate or release up to four relays
from any part of the network element or DSM. Connect the relays to external
equipment and program each relay with a control type attribute.
ACO switch — clearing audible alarms and performing lamp tests
The OPTera Metro 3500 network element and the DSM have an alarm cut-off
(ACO) button. The ACO button for the network element is on the left interface
(LIF) and the ACO button for the DSM is located on the fan faceplate of the
DSM. The alarm subsystem turns off the audible office alarm relay(s) when
you press the ACO button once.
Note: The ACO button on the network element also cuts off alarms and
performs lamp tests on connected DSMs.
The DSM has its own alarm cut-off button (ACO) because the DSM, although
connected to the shelf, can be located in another area that is far from the shelf.
You can turn off the audible alarms on both the network element and the DSM
from the Site Manager interface.
You can perform a lamp test on the network element or DSM by pressing the
ACO button twice.
Bandwidth management
OPTera Metro 3500 supports a built-in, fully non-blocking switching matrix.
OPTera Metro 3500 is capable of routing up to 192 STS-1 signals, 5376 VT1.5
channels when equipped with VTX-48 or VTX-48e modules. See
Figure 2-2
on page 2-10 . With the introduction of new STS-192 circuit pack the OPTera
Metro 3500 is now capable of routing 768 STS-1 signals. See Figure 2-3 on
page 2-10 . This eliminates the need for adjunct cross-connect facilities in most
applications.