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| 型號： | T7630 |
| 英文描述： | T7630 Dual T1/E1 5.0 V Short-Haul Terminator (Terminator-II) |
| 中文描述： | T7630雙T1/E1的5.0V的短途終結(jié)者（終結(jié)者-Ⅱ） |
| 文件頁數(shù)： | 27/210頁 |
| 文件大?。?/td> | 3075K |
| 代理商： | T7630 |
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Lucent Technologies Inc.
Lucent Technologies Inc.
27
Preliminary Data Sheet
October 2000
T7630 Dual T1/E1 5.0 V Short-Haul Terminator (Terminator-II)
Line Interface Unit: Receive
(continued)
For E1 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 contig-
uous pulse positions. LOSSTD has no effect in E1
mode.
Upon the transition from DLOS = 0 to DLOS = 1, a
microprocessor interrupt will be generated if the DLOS
interrupt enable bit DLOSIE (register LIU_REG1, bit 1)
is set. The reset default is DLOSIE = 0.
The DLOS alarm may occur when FLLOOP is activated
(see Line Interface Unit: Loopbacks) due to the abrupt
change in signal level at the receiver input. Setting the
FLLOOP alarm prevention PFLALM = 1 (register
LIU_REG 4, bit 2) prevents the DLOS alarm from
occurring when FLLOOP is activated by quickly reset-
ting the receiver’s internal peak detector. It will not pre-
vent the DLOS alarm during the FLLOOP period but
only avoids the alarm created by the signal amplitude
transient. The reset default is PFLALM = 0.
Table 3. DLOS Standard Select
Loss Shutdown (LOSSD) and Receiver AIS
(RCVAIS).
The loss shutdown (LOSSD) control bit (reg-
ister LIU_REG3, bit 4) acts in conjunction with the
receive alarm indication select (RCVAIS) control bit
(register LIU_REG4, bit 1) to place the digital RLIU sig-
nals (RPD-LIU, RND-LIU, RLCK-LIU) in a predeter-
LOSSTD
0
DS1 Mode
T1M1.3/93-005,
ITU-T G.775
TR-TSY-000009
CEPT Mode
ITU-T G.775
1
ITU-T G.775
mined state when a DLOS or ALOS alarm occurs.
If LOSSD = 0 and RCVAIS = 0, the RND-LIU, RPD-
LIU, and RLCK-LIU signals will be unaffected by the
DLOS alarm condition. However, when an ALOS alarm
condition is indicated in the LIU alarm status register
(register LIU_REG0, bit 0), the RPD-LIU and RND-LIU
signals are forced to 0 state and the RLCK-LIU free
runs (at the INTSYSCK/16 frequency).
If LOSSD = 1, RCVAIS = 0, and a DLOS alarm condi-
tion is indicated in the LIU alarm status register (regis-
ter LIU_REG0, bit 1) or an ALOS alarm condition is
indicated, the RPD-LIU and RND-LIU signals are
forced to the inactive (dependent on ALM) and the
RLCK-LIU free runs (at the INTSYSCK/16 frequency).
If LOSSD = 0, RCVAIS = 1, and a DLOS or an ALOS
alarm condition is indicated in the LIU alarm status reg-
ister (register LIU_REG0, bits 0 or 1), the RPD-LIU and
RND-LIU signals will present an alarm indication signal
(AIS, all ones) based on the free-running INTSYSCK/
16 frequency.
If LOSSD = 1, RCVAIS = 1, and a DLOS or an ALOS
alarm condition is indicated in LIU alarm status register
(register LIU_REG0, bits 0 or 1), the RPD-LIU and
RND-LIU signals are forced to inactive (dependent on
ALM) and the RLCK-LIU free runs at the INTSYSCK/
16 frequency.
The RND-LIU, RPD-LIU, and RLCK-LIU signals will be
remain unaffected if any loopback (FLLOOP RLOOP
DLLOOP) is activated independent of LOSSD and
RCVAIS settings.
The default reset state is LOSSD = 0 and RCVAIS = 0.
The LOSSD and RCVAIS behavior is summarized in
Table 4.
Table 4. LOSSD and RCVAIS Control Configurations (Not Valid During Loopback Modes)
LIU Receiver BPV Alarm.
The receiver LIU BPV alarm is used only in the single-rail mode. When B8ZS(DS1)/
HDB3(E1) coding is not used (i.e., CODE = 0), any violations in the receive data (such as two or more consecutive
ones on a rail) are indicated on the RND-LIU output. When B8ZS(DS1)/HDB3(E1) coding is used (i.e., CODE = 1),
the HDB3/B8ZS code violations, as defined in the appropriate standards, are reflected on the RND-LIU output.
LOSSD
0
0
1
1
0
0
1
1
RCVAIS
0
0
0
0
1
1
1
1
ALARM
ALOS
DLOS
ALOS
DLOS
ALOS
DLOS
ALOS
DLOS
RPD/RND
RLCK
Free Runs
Recovered Clock
Free Runs
Free Runs
Free Runs
Free Runs
Free Runs
Free Runs
Inactive (1/0 dependent on ALM)
Normal Data
Inactive (1/0 dependent on ALM)
Inactive (1/0 dependent on ALM)
AIS (all ones)
AIS (all ones)
Inactive (1/0 dependent on ALM)
Inactive (1/0 dependent on ALM)
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