Alarm Dialout; Aco Button; Bypass Button; Bypass - Coastcom D/I Mux III System User Manual

Alarm
Major
Major with ACO
Minor

Alarm Dialout

The D/I Mux III can report new alarm conditions to remote locations by dialing out through a port
expander and a modem. At the other end of the connection, the alarms can be sent to a printer, or can
be controlled and directed by any commercially available terminal emulation software product.
To set up the Alarm Dialout option, use the Set communications Options (SO) command.
CCU/AMCU Front Panel Switches
The CCU and AMCU front panel switches are momentary push-buttons which initiate a process. The
switches have multiple functions depending on the set-up of the multiplexer and alarm condition.

ACO Button

The Alarm Cut-Off (ACO) button is used when the D/I Mux III is in major alarm to cut off the
audible alarm, and to allow bypass operation initiation.

Bypass Button

The Bypass (BYP) button forces both T1-1 and T1-2 to bypass a D/I Mux III that is in the drop-
and-insert mode, while in a major alarm, and following Alarm Cut-Off (ACO). Bypass permits the
T1s to go through the system unaltered, as if the D/I Mux III were not in the T1 transmission path.
The bypass function only operates in the drop-and-insert mode.

Bypass

Bypass can function only when the multiplexer is in an alarm condition, and the ACO button has
previously been pushed, or if ACO has been initiated by software control. Remove the bypass operation
by pressing the bypass switch a second time, or through software selection.
In single channel bank mode, the bypass relays will cause the Pulse Code Modulation (PCM) signal on
the shelf backplane to be looped back to the Line Interface Units (LIUs). The local and remote alarms
will clear in approximately 10 seconds when the LIUs have synchronized to the loop condition. If the
local and remote alarms do not clear, there may be a problem with the LIUs. The multiplexer remains in
Carrier Group Alarm (CGA) during the bypass operation, and the multiplexer transmits a framed T1
pattern while in bypass mode.
Chapter 5. Diagnostics
Table 5-1. Alarm Contacts and Alarm Cut-Off (ACO)
Audible Contact
Closed
Open
Open
Visual Contact
Closed
Closed
Open
164
Minor Contact
Open
Open
Closed