Polycom DOC2237A manual When the MCU is set as a DTE, MPI-8 Network Interface Data Stream

Chapter 4 - Hardware Description

MPI-8 Network Interface Data Stream

When the MCU is set as a DTE

The ISDN data stream flows from the ISDN telecommunication network through the DCE to the serial port (37-pin connector) on the MPI box. The data is then directed from the 37-PIN connector to the 160-PIN connector, which gathers data from four different ports, and channels the data stream to the 160-pin connector located on the MPI-8 front panel. The data is then converted from serial format to TDM format and flown to the Backplane information bus.

The master and the Backup clock must be set on spans of the same network type.

Since this is full duplex communication, the data is also flowing in the opposite direction. Figure 4-22 shows the data flow on an ISDN data stream.

To the 160-PIN connector on the MPI-8 module

MPI Box

160-PIN	37-PIN
	connector
connector
37-PIN connector
	37-PIN
	connector
	37-PIN
	connector

Serial

connection

Serial

connection

DCE

						Channels 1-6
				nels 7-12
Chan
								4
							-1
						3
					1					6
				ls
			e							1
		nn								-
	a								5
h								1
C								ls
							e
						n
						n
					a
					h
			C

T1 ISDN line

(23 channels)

Figure 4-23: MPI Data Flow when MCU is DTE

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