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The NPEs do switching network functions for the port circuits. Under control of the on-
board microprocessor, an NPE can connect a port circuit to any one of the TDM bus time
slots. More specifically, it allows a port circuit to talk on one time slot and listen to the
same time slot (NPE sidetone) and on up to four other time slots at the same time. In 2-
wire circuits that provide their own sidetone, the NPE sidetone is not used.
Circuit Pack Address Leads:
Seven leads (BA0-BA6) are tied to Corresponding logic
levels to uniquely identify each CP slot in the system, including multiple cabinet systems.
The logic values on leads BA4 and BA5 are used to identify the cabinet (Cabinet 1, 2, or 3)
and are tied via the cabinet address plugs to either +5V de or ground, as appropriate. Lead
BA6 is tied to ground.
❘
●
TDM
BUS
LEADS
CIRCUIT
PACK
ADDRESS
LEADS
NPE(S)
BUS
❘
BUFFERS
❘
●
RAM
❘
❘
SAKI
●
❘
RED
LEDS
ON-BOARD
MICRO-
PROCESSOR
PORT
SPECIFIC
CIRCUITRY
GREEN
YELLOW
Figure 3-7. Port Circuit Pack Common Circuitry
3-15