MC145572APB Freescale Semiconductor, MC145572APB Datasheet - Page 36

• Manufacturer Part Number: MC145572APB
• Description: IC ISDN INTERFACE TXCVER 44-LQFP
• Manufacturer: Freescale Semiconductor
• Type: Transceiverr

Specifications of MC145572APB

• Protocol: RS232
• Voltage - Supply: 5V
• Mounting Type: Surface Mount
• Package / Case: 44-LQFP
• Number Of Line Interfaces: 1
• Control Interface: HDLC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Number Of Drivers/receivers: -
• Lead Free Status / Rohs Status: Not Compliant

activated. At any given time, only one loop-back point can be enabled. This permits user equipment to be
half of the board, user equipment can be connected to the IDL Interface on the LT side of the
MC145572EVK.
The LT side U-Interface Transceiver can be activated with 2B+D loop-back to the U-Interface. This mode
enables the received digital data from the U-Interface to be looped back to the LT side U-Interface
Transceiver transmitter, and re-transmitted onto the U-Interface. The loop-back point occurs in the IDL
Interface block internal to the U-Interface Transceiver.
The LT side U-Interface Transceiver can also be activated without any loop-backs initially enabled. A
loop-back is then implemented simply by shorting BNC J7 RXDATA to BNC J8 LTXDATA.
The NT1 side U-Interface Transceiver can be activated with 2B+D loop-back enabled in the S/T-Interface
Transceiver IDL Interface. Received data from the NT1 side U-Interface Transceiver is transmitted on the
IDL Interface to the S/T-Interface Transceiver where it is looped-back to the IDL Interface and re-transmitted
by the NT1 U-Interface Transceiver towards the U-Interface.
The NT1 side U-Interface Transceiver can be activated with the S/T-Interface Transceiver disabled. This
causes the S/T-Interface Transceiver to three-state its IDL Interface transmitter. This provides the NT1 side
U-Interface Transceivers IDL Interface direct access to the NT1 side IDL Interface. This permits the user
to connect their own equipment to the NT1 side IDL Interface without any possibility of bus contention with
the S/T-Interface Transceiver.
The NT1 side U-Interface Transceiver can also be activated without any loop-back. This permits the NT1
side U-Interface Transceiver to communicate with the S/T-Interface Transceiver over the IDL Interface. A
loop-back is implemented by shorting BNC J18 NTRXDATA to BNC J20 NTTXDATA.
3.2.1.3 MENUS.
Operation With the MC145572EVK Board
The ACT command provides user access to the full set of activation and deactivation options. Four menu
option groups are displayed on the terminal.
Options A through D permit activation of the NT1 side U-Interface Transceiver independently of the LT
side U-Interface Transceiver. These options would typically be used when the NT1 side U-Interface is
connected to an incoming 2B1Q line from a central ofÞce, or to the LT side U-Interface connector on a
second MC145572EVK.
Options E and F permit activation of the LT side U-Interface Transceiver independently of the NT1 side
U-Interface Transceiver. These options would typically be used when the LT side U-Interface is connected
to a separate NT1 or to the NT1 side U-Interface connector on a second MC145572EVK.
Options G through J are used when the LT side and the NT1 side U-Interface connectors on an
MC145572EVK are connected together.
Options K through O are used to deactivate the U- and S/T-Interface Transceivers in a controlled manner.
EXAMPLE 1
NTLT>act
3.2.1.2 LOOP-BACK OPTIONS. The activate command provides Þve different points on the
MC145572EVK board where loop-backs are permitted when one or both U-Interface Transceivers are
connected to the opposite side of the MC145572EVK. For example, if a loop-back is selected on the NT1
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MC145572EVK
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