參數(shù)資料
型號： TLIU04C1
英文描述： TLIU04C1 Quad T1/E1 Line Interface
中文描述： TLIU04C1四T1/E1線路接口
文件頁數(shù)： 70/100頁
文件大?。?/td> 1321K
代理商： TLIU04C1
Advance Data Sheet, Rev. 2
TLIU04C1 Quad T1/E1 Line Interface
April 1999
70
Lucent Technologies Inc.
Direct Logic Control Mode
(continued)
Receiver Configuration Modes
(continued)
RLIU Alarms
Analog Loss of Signal (ALOS) Alarm
. An analog sig-
nal detector monitors the receive signal amplitude and
reports its status on the analog loss of signal alarm
pins. An analog loss of signal is indicated if the ampli-
tude at the RRING and RTIP inputs drops more than
approximately 18 dB below the nominal signal ampli-
tude. The ALOS alarm condition will clear when the
receive signal amplitude returns to greater than 14 dB
below normal. In this way, the ALOS circuitry provides
4 dB of hysteresis to prevent alarm chattering.
The time required to detect ALOS is selectable. When
ALTIMER = 0, ALOS is declared between 1 ms and
2.6 ms after losing signal as required by I.431(3/93)
and ETS-300-233 (5/94). If ALTIMER = 1, ALOS is
declared between 10 and 255 bit symbol periods after
losing signal as required by G.775 (11/95). The timing
is derived from the XCLK clock. The detection time is
independent of signal amplitude before the loss condi-
tion occurs. Normally, ALTIMER = 1 would be used only
in CEPT mode since no T1/DS1 standards require this
mode. In T1/DS1 mode, this pin should normally be
tied low.
The behavior of the receiver outputs under ALOS con-
ditions depends on the loss shutdown (LOSSD) control
pin in conjunction with the receiver AIS (RCVAIS) con-
trol pin as described in the Loss Shutdown (LOSSD)
and Receiver AIS (RCVAIS) section on page 71.
Digital Loss of Signal (DLOS) Alarm
. A digital loss of
signal (DLOS) detector guarantees the received signal
quality as defined in the appropriate ANSI, Bellcore,
and ITU standards. The digital loss of signal alarms are
reported on the DLOS alarm pins. During DS1 opera-
tion, a digital loss of signal is indicated if 100 or more
consecutive zeros occur in the receive data stream.
The DLOS condition is deactivated when the average
ones density of at least 12.5% is received in 100 con-
tiguous pulse positions. The LOSSTD control bit
selects the conformance protocols for the DLOS alarm
indication per Table 41. Setting LOSSTD = 1 adds an
additional constraint that there are less than 15 con-
secutive zeros in the DS1 data stream before DLOS is
deactivated.
During CEPT operation, DLOS is indicated when 255
or more consecutive zeros occur in the receive data
stream. The DLOS indication is deactivated when the
average ones density of at least 12.5% is received in
255 contiguous pulse positions. LOSSTD has no effect
in CEPT mode.
Table 41. Digital Loss of Signal Standard Select
LOSSTD
0
1
DS1 Mode
CEPT Mode
ITU-T G.775
ITU-T G.775
T1M1.3/93-005, ITU-T G.775
TR-TSY-000009
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