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MAINT (PN’s Maintenance Circuit Pack)
Issue 1 June 2005 1491
closing the relay on either the PN’s Maintenance circuit pack (whichever is specified) for 1
minute. The repeat parameter may be used to close the relay for a longer length of time where
the number of the repeat is the number of minutes for which the device will be activated (5
minutes is the suggested repeat value).
Note:
Note: S8700 and S8500 media servers equipped with G650 carriers will differ from this
MO, in that the IPSI board provides the CPAD leads. The intent for the feature is
in other ways the same.
The test customer-alarm location command is provided to allow a technician to check
that the customer-provided alarming device is correctly installed and functional (See
Customer-Provided Alarming Device Test (#115)
on page 1506). It is recommended that this
test be run at least once after both the switch and the customer alarm have been installed.
Connectivity paths
The media server communicates with a PN’s Maintenance circuit pack via the following path.
(Up-link messages back from this Maintenance circuit pack to the media server take the reverse
path.) Messages flow from the media server’s processor to an IPSI connected PN’s TN2312AP
IPSI circuit pack’s Packet Interface circuit, over this PN’s LAN bus to its Expansion Interface
circuit pack, across the fiber link to the active PN’s Expansion Interface circuit pack, and over a
serial link to the PN’s Maintenance circuit pack.
The PN’s Maintenance circuit pack must be physically inserted into the dedicated slot marked
Maintenance in the A carrier of the PN. The serial links from the PN’s Maintenance circuit pack
to the Expansion Interface circuit packs are physically connected from this dedicated slot to
slots 2A01 and 2B02 (2B02 is used only if there is duplicated Port Network Connectivity). The
serial link from slot 2A01 to the maintenance slot is hard-wired into the backplane of carrier A,
whereas the serial link from slot 2B02 to the maintenance slot is a ribbon cable connecting the
two slots. The serial link from the PN’s Maintenance circuit pack to the terminal is also a ribbon
cable which plugs into a connector labeled TERM on the back of carrier A.
The maintenance strategy for the PN’s Maintenance circuit pack consists of checking the
integrity of the communications path to/from the PN’s Maintenance circuit pack, testing
individual hardware components on the PN’s Maintenance circuit pack, and keeping the alarm
LEDs up-to-date. The individual hardware components include the serial interfaces which
handle the serial links connected to the PN’s Maintenance circuit pack. There are three serial
interfaces, one for each possible Expansion Interface circuit pack and one for the terminal.
Since the PN’s Maintenance circuit pack supports environmental maintenance in the PN,
trouble with the PN’s Maintenance circuit pack can cause environmental maintenance to falsely
detect problems. In a multicarrier cabinet PN, these environmental MOs include: POWER
(Battery and Battery Charger), CARR-POW (Carrier Port Power Unit), AC-POWER (AC Power),
CABINET (Cabinet Sensors), EMG-XFER (Emergency Transfer), EXT-DEV (External Device
Alarm), and CUST-ALM (Customer-Provided Alarming Device). In a single carrier cabinet PN,
these environmental MOs include DC-POWER (Single Carrier Cabinet Power), EMG-XFER
(Emergency Transfer), EXT-DEV (External Device Alarm), and CUST-ALM (Customer-Provided
Alarming Device).