IPE architecture 2-13
Meridian SuperNode MSL-100 Intelligent Peripheral Equipment (IPE) Reference Manual MSL14
cover each side of each module in the IPEC. These are needed only for sides
that are exposed, not for sides that are bolted to another module.
Top cap (NT7D00)
A top cap (NT7D00) completes each IPEC. It is mounted on the highest
module of each column. See figure "Minimum and maximum modules in an
IPEC" on page 2-2 and figure "IPEC configuration—exploded view" on
page 2-3.
The top cap consists of thermal sensors, a fan speed sensor, a front and rear
exhaust grill, and a column alarm indicator. The sensors and alarm indicator
interface with the XSM card located in the pedestal.
For sites requiring overhead cable entry to the IPEC, an optional Top Cap Rear
Grill (P0699851) can be used.
Extended system monitor
The XSM (NT8D22) is a microprocessor-based circuit pack located in the IPE
pedestal base. The XSM monitors the operation and status of the IPE power
supplies, ringing generators, column thermal sensors, and blower units.
Master and slave XSMs
One IPEC can contain up to four IPE modules, numbered from 0 to 3 (bottom
to top). Each IPEC requires one XSM that can be configured either as a master
or a slave. Two 8-position DIP switches on the XSM indicate the system
configuration, XSM function, and address.
One master XSM supports up to 64 columns (itself and up to 63 slave XSMs
located in other columns) using a daisy chain of serial communication links.
Only the master XSM reports the status (of itself and the slaves connected to
it) to the system Central Processing Unit (CPU) or responds to the system
status inquiry messages.
Slave XSMs under the control of a given master XSM must be numbered
sequentially (DIP switch setting). Failure to do so results in incorrect fault
reports being generated for any slave XSM missing from the sequence. For
example, if slave XSMs are numbered 1, 3, 4, and 8, the master XSM would
report that slaves 2, 5, 6, and 7 are not reporting.
If additional slaves are added to the daisy-chain with a previously configured
and working master XSM, the DIP switch setting for the master XSM must be
changed to reflect the new number of slave XSMs under the control of the
master XSM.
The XSM status is reported to the system CPU over an RS-232-C
communication path. The XSM reports monitored status, responds to system