Verilink 2000 (34-00182) Product Manual - Manual (Page 27)

Power Connection 2-15
beeping from the unit draws attention that T1 service is compromised. This alarm
is enabled by Switch S4 -2 (refer to Audible Alarm on page 2 -5).
Chassis
Assembly
Alarm conditions from all modules in the chassis are bused together in parallel and
are presented on a single set of alarm relay contacts which permit connection to a
remote indicating device. When connected, pins 3 and 4 on terminal strip TB1
operate in a normally open mode. Refer to the 1051 -2 Chassis Configuration
Guide for more information.
All modules in a common chassis must use the normally open contact mode.
Make connections to the alarm contacts using 20 -gauge stranded wire (or similar).
The contacts are rated at 120 mA AC or 120 mA DC.
External Major Alarm Relay
The CSU allows normally open (NO) or normally closed (NC) alarm relay
contacts. Using normally open contacts, a nest of CSUs and any other equipment
may use a common bused alarm line that is pulled high or low. Using a normally
closed contact set allows a serial daisy chain from unit to unit. A unit going into
alarm breaks the alarm loop. This physical indication provides an alternate
reporting method to the telco. It is useful when the telco is not using a
management system or the link to the management system is not functional.
Power
Connection The stand -alone unit and the modular chassis unit require a -48 VDC power
source that is capable of supplying 90-mA current. Power supplies are available
from TxPORT and are listed in Optional Equipment on page 1 -7.
Connect the ground lead before applying power to the unit.
Stand-alone
Unit
The power source is connected to pins 1 and 3 of the Power and Alarm terminal as
shown in Table 2-12.
Connect a chassis ground lead (18 - to 20 -gauge is recommended) to the Frame
Ground terminal (pin 4). Connect the other end of this lead to an appropriate
facility ground. Often, the 48 VDC return is also ground. In that case, both return
and ground leads should be connected to ground. Connect the -48 VDC lead to the
-48 VDC terminal (18- to 20-gauge recommended). Connect the return lead to the
48 VDC return terminal.
When power is applied to the unit, the front panel indicators flash for
approximately 10 seconds as the unit executes a self-test function. If an ambiguous
configuration has been programmed, the front panel indicators continue to flash
after the self- test is completed. If the unit is correctly configured, the green
STATUS indicator on the front panel should light.
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