The Net-2/Net-4/Net-8 Isdn/T1-Cas Network Interface; Data Stream - Polycom DOC2238A Hardware Installation Manual

Chapter 4 - Hardware Description
4-22
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
Span A
RJ45
Span B
Backplane
IO-2
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.
IO-4
NET
IO-2
ISDN
Telephone
Network
Lines
A
B
IO-8
IO-4