MC145572PB Freescale Semiconductor, MC145572PB Datasheet - Page 19

• Manufacturer Part Number: MC145572PB
• Manufacturer: Freescale Semiconductor

Specifications of MC145572PB

• Number Of Line Interfaces: 1
• Control Interface: HDLC
• Lead Free Status / Rohs Status: Not Compliant

MOTOROLA
2.1
2.2
ISDN REFERENCE MODEL
The ISDN reference model is shown in Figure 2–1. This is a general model that can be adapted to
many different implementations of the ISDN. The diagram indicates the position of the U–reference
point between the LT and the Network Termination 1 (NT1) blocks in the model.
The U–interface is the physical access point to the ISDN at the U–reference point. This interface is
a single twisted wire pair supporting full–duplex transmission of digital information at a rate of 160 kbps.
The twisted wire pair can extend up to 18,000 feet and may include bridge taps. This interface is often
referred to as a Digital Subscriber Line.
U-INTERFACE TRANSCEIVER ISDN APPLICATIONS
Figure 2–2 shows some typical ISDN applications of the MC145572 U–interface transceiver as well
as related ISDN applications for S/T–interface terminal equipment using Motorola semiconductor solu-
tions.
The LT example shows the U–interface transceiver in a line card environment. This line card can be
located in an ISDN central office switch or other ISDN compatible switching equipment, including a
remote switch or carrier terminal. In this application, the IDL and SCP of the MC145572 are interfaced
to the backplane of the switching equipment as required for the particular switch architecture.
Key:
REFERENCE
CCSN: Common Channel Signalling Network
CSN:
ET:
LT:
NT1:
TE2
POINTS:
ISDN BASIC ACCESS SYSTEM OVERVIEW
Circuit Switched Network
Exchange Termination (C.O. Switch)
Line Termination (Line Card)
Network Termination 1 (OSI Layer 1 Only)
R
Freescale Semiconductor, Inc.
For More Information On This Product,
TE1
TA
Go to: www.freescale.com
S
Figure 2–1. ISDN Reference Model
NT2
MC145572
T
NT1
NT2: Network Termination 2 (OSI Layers 2 and 3)
PSN: Packet Switched Network
TA:
TE1: Terminal Equipment 1 (ISDN Terminal)
TE2: Terminal Equipment 2 (Non–ISDN Terminal)
Terminal Adapter
U
LT
V
ET
PSN
CSN
CCSN
2
2–1