參數(shù)資料
型號(hào)： 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(yè)數(shù)： 25/54頁(yè)
文件大?。?/td> 876K
代理商： T7264
Lucent Technologies Inc.
25
Data Sheet
April 1998
T7264 U-Interface 2B1Q Transceiver
K2 Functional Description
(continued)
K2 Device Status and Control Bits
The T7264 device status bits are transmitted over the
K2 interface in the DS octet. The status information
includes the nebe, xact, and oof bits which are used to
determine the status of the line interface and to control
the activate/deactivate state machine.
The T7264 device control bits are transmitted over the
K2 interface in the DC octet. The control information
includes the ccrc, istp, lpbk, afrst, ldea, and xpcy bits
which provide the control necessary to implement the
activation/deactivation state machine.
Tables 18 and 19 show how the DC bits are sampled
and when the DS bits are available. Note that a Y in the
column marked Hyst (hysteresis) indicates that the vali-
dation occurs on both entry and exit from the condition.
An N in the Hyst column indicates that the validation
occurs only on entry into that condition. For validation,
a signal must be present for three consecutive K2
frames.
In LT mode, setting the ldea (local deactivation) bit
causes the transceiver to send 3 or 4 superframes of
dea = 0 across the U-interface, save the adaptive filter
coefficients, and cease transmission.
In the NT mode, the ldea bit is used to ensure that the
transceiver is capable of a warm start on the next acti-
vation; however, the transceiver must be given
advance warning prior to loss of signal. This should be
done by filtering dea = 0 for two superframe occur-
rences prior to setting ldea = 1. This causes the trans-
ceiver to freeze echo canceler coefficients. The
transceiver then either deactivates upon detection of
loss of signal or resumes training the echo canceler if
ldea = 0 is received instead of detecting loss of signal.
In both LT and NT modes, the lpbk (local loopback) bit
is used to request a local loopback within the trans-
ceiver from the K2 input (DI) to the K2 output (DO).
During loopback, the transceiver turns off the echo
canceler (disables the canceler output from the
summing node) and reconfigures the descrambler. To
perform loopback, set afrst = 1 and lpbk = 1, discon-
nect the U-interface metallic connection to the loop
plant, then set afrst = 0 and lpbk = 0. Loopback has
become valid when oof = 1. In order to terminate the
loopback, set afrst = 1 and lpbk = 1. Reconnect the
loop plant, then set afrst = 0. During the entire loop-
back test, istp = 1 and xpcy may be either 0 or 1.
Table 18. DC Octet Description (Control)
Table 19. DS Octet Description (Status)
Control (DC)
ccrc bit
Description
Corrupt crc
Hyst
N
Timing
Sample K2 frames 9, 10, 11 for three consecutive ccrc = true K2
frames. Continues to corrupt until the condition goes away.
Sample for three consecutive K2 frames to validate.
Sample for three consecutive K2 frames to validate.
Sample for three consecutive K2 frames to validate.
Sample for three consecutive K2 frames to validate.
Sample for three consecutive K2 frames to validate.
istp
ldea
xpcy
afrst
lpbk
Initiate Start-up
Local Deactivate
Transparency
Reset
Loopback
N
Y
Y
Y
Y
Status (DS)
nebe
xact
oof
Description
Near-end Block Error
Transceiver Active
Out of Sync
Timing
Presented to K2 interface on frame K95 to K94.
Presented to K2 interface as it occurs.
Presented to K2 interface as it occurs.
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