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參數(shù)資料
| 型號： | T7264 |
| 英文描述： | T7264 U-Interface 2B1Q Transceiver |
| 中文描述： | T7264 U型接口2B1Q收發(fā)器 |
| 文件頁數(shù)： | 26/54頁 |
| 文件大?。?/td> | 876K |
| 代理商： | T7264 |
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26
Lucent Technologies Inc.
Data Sheet
April 1998
T7264 U-Interface 2B1Q Transceiver
K2 Functional Description
(continued)
The adea Bit
The adea bit is only available when the MODE0 pin is set to 1 (LT mode). Setting adea = 0 causes the LT to set
dea = 0 on the U-interface without deactivating itself. By contrast, setting ldea = 1 at the LT causes the LT to set dea
= 0 on the U-interface, save adaptive filter coefficients, and deactivate itself after sending dea = 0 for three consec-
utive U superframes.
In loop configurations with multiple U-interfaces, as shown in T1.601, adea is used to propagate dea = 0 beyond the
local link (the link between the LT in an ISDN serving switch to the next NT downstream-type element of the loop)
and can be used to deactivate a nonlocal link without deactivating the local link.
Table 20 shows the effects of the adea and ldea bits at the LT.
Table 20. adea, ldea, and dea Function
adea at LT
0
X
ldea at LT
0
1
Action
dea = 0 is sent downstream, but no local deactivation occurs.
dea = 0 is sent downstream for 3 or 4 superframes, echo canceler coefficients are
frozen, and transmission ceases.
dea = 1 is sent downstream (normal operation).
1
0
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