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MC145574 Datasheet

  • MC145574

  • ISDN S/T-Interface Transceiver

  • 658.40KB

  • Motorola   Motorola

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Freescale Semiconductor, Inc.
ACTIVATION/DEACTIVATION OF S/T TRANSCEIVER
3
3.1
INTRODUCTION
CCITT I.430, ETSI ETS 300012, and ANSI T1.605 define five information states for the S/T transceiver.
When the NT is in the fully operational state, it transmits INFO 4. When the TE is in the fully operational
state, it transmits INFO 3. INFO 1 is transmitted by the TE when it wants to wake up the NT. INFO 2
is transmitted by the NT when it wants to wake up the TE, or in response to the TE鈥檚 transmitted
INFO 1. These states cause unique patterns of symbols to be transmitted over the S/T鈥搃nterface.
Only when the S/T loop is in the fully activated state are the 2B+D channels of data transmitted over
the interface.
Freescale Semiconductor, Inc...
3.2
TRANSMISSION STATES FOR NT MODE S/T TRANSCEIVER
When configured as an NT, an S/T transceiver can be in any of the following transmission states shown
in Table 3鈥?.
Table 3鈥?. NT Mode Transmission States
Information State
INFO 0
INFO 2
INFO 4
Description
The NT transmits 1s in every bit position. This corresponds to no signal being transmitted.
The NT sets its B1, B2, D, and E channels to 0. The A bit is set to 0. (See Sections 3.12.1 and
3.12.2.)
INFO 4 corresponds to frames containing operational data on the B1, B2, D, and E channels.
The A bit is set to 1.
3.3
TRANSMISSION STATES FOR TE MODE S/T TRANSCEIVER
When configured as a TE, an S/T transceiver can be in any of the following transmission states shown
in Table 3鈥?.
Table 3鈥?. TE Mode Transmission States
Information State
INFO 0
INFO 1
INFO 3
Description
The TE transmits 1s in every bit position. This corresponds to no signal being transmitted.
The TE transmits a continuous signal with the following pattern: positive 0, negative 0, six 1s.
This signal is asynchronous to the NT.
INFO 3 corresponds to frames containing operational data on the B1, B2, and D channels. If
INFO 4 or INFO 2 is being received, INFO 3 will be synchronized to it.
3.4
ACTIVATION OF S/T LOOP BY NT
The NT activates the loop by transmitting INFO 2 to the TE(s). This is accomplished in the MC145574
by setting NR2(3) to a 1 (see Section 3.12.3). Note that this bit is internally reset to 0 after the internal
activation state machine has recognized its active transition.
The TE on receiving INFO 2 synchronizes to it and transmits back INFO 3 to the NT. The NT, on
receiving INFO 3 from the TE, responds with INFO 4, thus activating the loop.
MOTOROLA
MC145574
For More Information On This Product,
Go to: www.freescale.com
3鈥?

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