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參數(shù)資料
| 型號(hào)： | MC145572 |
| 廠商： | Motorola, Inc. |
| 英文描述： | ISDN U-Interface Transceiver(ISDN U接口收發(fā)器) |
| 中文描述： | 綜合業(yè)務(wù)數(shù)字網(wǎng)U型接口收發(fā)器（綜合業(yè)務(wù)數(shù)字網(wǎng)ü接口收發(fā)器） |
| 文件頁(yè)數(shù)： | 113/264頁(yè) |
| 文件大小： | 2832K |
| 代理商： | MC145572 |
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MC145572
6–3
MOTOROLA
When configured as an LT, the MC145572 U–interface transceiver can transmit any of the signals
shown in Table 6–2. The actual procedure undertaken by the device using these five signals is de-
scribed later in this chapter.
Section 4.4.9
describes how to control the transmit framer when it is
desired to generate signals for test purposes.
Table 6–2. LT Mode Activation Signals
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á
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Station
Description
TL
A 10 kHz tone consisting of alternating four + 3 quats followed by four – 3 quats for a time period of two frames.
SL0
No signal transmitted.
SL1
Synchronization word present, no Superframe Synchronization word (ISW), and 2B+D+M = 1.
áááááááááááááááááááááááááááááá
SL2
Synchronization word present, Superframe Synchronization word (ISW) present, 2B+D = 0, and M = Normal.
ááá
á
SL3
á
Synchronization word present, Superframe Synchronization word (ISW) present. M channel bits active.
The MC145572 U–interface transceiver can be activated in either of two ways. The external microcon-
troller can explicitly issue Activation Request (NR2(b3) = 1) or the transceiver detects an incoming
10 kHz wake–up tone. An LT configured U–interface transceiver searches for an NT sending the TN
wake–up tone. An NT configured U–interface transceiver searches for an LT sending the TL wake–up
tone. In IDL2 mode, the Activation in Progress status bit (NR1(b0)) is set to a 1 when an incoming
10 kHz wake–up tone is detected. In either case, Activation Request being set or a wake–up tone
being detected, the U–interface transceiver proceeds with activation automatically and signals the
result of the activation to the external microcontroller by setting status bits in NR1 to $B.
An NT configured U–interface transceiver always initiates activation by sending a TN tone to the LT.
This is done in response to the LT sending a TL or when the Activation Request bit (NR2(b3)) is set
to a 1.
An LT configured U–interface transceiver initiates activation by sending the TL tone when the Activa-
tion Request bit is set to a 1 by an external microcontroller. The NT U–interface transceiver responds
to the TL tone by sending a TN tone back to the LT U–interface transceiver. Otherwise, the LT U–inter-
face transceiver waits for an unsolicited incoming TN tone from the NT U–interface transceiver and
self–activates. Regardless of how activation is initiated, the LT U–interface transceiver automatically
activates from the point where it detects the incoming TN tone from the NT transceiver.
When configured for MCU mode, all appropriate maintenance channel registers should be initialized
prior to setting Activation Request (NR2(b3)) or immediately after detecting Activation in Progress
(NR1(b0)) = 1. In GCI mode, the MC145572 automatically initializes the maintenance channel regis-
ters.
Some applications, such as U–repeaters, may require longer than 15 seconds of activation time. The
15–second activation timer can be disabled by setting Activation Timer Disable (BR11(b0)) to a 1.
NT mode activation initiation is accomplished by setting Activation Request (NR2(b3)) to a 1. The
NT U–interface transceiver initiates activation of the U–interface by transmitting TN for a time period
of six frames (9 ms) toward the LT. At this time, the NT U–interface transceiver also sets Activation
in Progress (NR1(b0)) to a 1. Transmission of TN is immediately followed by transmission of SN1
while the echo cancellers are trained.
From Figure 6–1, it can be seen that the NT transceiver has a period of time during activation where
the LT end is guaranteed to be quiet. This is to permit the MC145572 to train its echo cancellers during
the transmission of SN1.
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| MC145572AAC | 功能描述:IC TRANSCEIVER ISDN 44-LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 類型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
| MC145572ACR2 | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Freescale Semiconductor 功能描述: |
| MC145572AEI | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Freescale Semiconductor 功能描述: |
| MC145572AFN | 功能描述:IC TRANSCEIVER ISDN 44-PLCC RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 類型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
| MC145572APB | 功能描述:IC ISDN INTERFACE TXCVER 44-LQFP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 類型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
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