Polycom DOC2238A manual Net-2/Net-4/Net-8 ISDN/T1-CAS Network Interface Data Stream

Chapter 4 - Hardware Description

The Net-2/Net-4/Net-8 ISDN/T1-CAS Network Interface Data Stream

Figure 4-12 shows a block diagram of the Net-2/Net-4/Net-8 network interface of the MGC+ unit.

RJ45	ISDN
Span A

RJ45

Span B

Telephone

Network

Lines

Backplane	IO-2
	IO-4

NET
	A
	B
IO-2	IO-4	IO-8

Figure 4-12: Net-2/Net-4/Net-8 ISDN/T1-CAS ISDN Network Interface Block Diagram

The ISDN Network Interface Module is connected to the telephone network via the IO card (IO-2, IO-4 or IO-8), which is connected to the PABX and CSU. The customer is responsible for supplying the PABX and CSU.

The ISDN data stream flows from the ISDN telecommunication network through the PABX > CSU > MGC+ RJ-45 input connector > IO card (IO-2, IO-4 or IO-8) > Backplane connectors > Network Interface Module to the Backplane information bus.

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