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| 型號： | T7633 |
| 廠商： | Lineage Power |
| 英文描述： | Dual T1/E1 3.3 V Short-Haul Terminator(雙T1/E1 3.3V短通信距離終端器) |
| 中文描述： | 雙T1/E1的3.3伏短途終結者（雙T1/E1的3.3短通信距離終端器） |
| 文件頁數(shù)： | 110/248頁 |
| 文件大?。?/td> | 1459K |
| 代理商： | T7633 |
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Advance Data Sheet
T7633 Dual T1/E1 3.3 V Short-Haul Terminator
May 1998
100
Lucent Technologies Inc.
Alarms and Performance Monitoring
(continued)
Loopback and Transmission Modes
(continued)
6. The PLLB mode loops the received line data and clock back to the transmit line while inserting (replacing) the
facility data link in the looped back data. Two variations of the payload loopback are available. In the pass
through framing/CRC bit mode (chosen by setting register FRM_PR24 to 111xxxxx (binary)), the framing and
CRC bits are looped back to the line transmit data. In the regenerated framing/CRC bit mode (chosen by
setting register FRM_PR24 to 110xxxxx (binary) and register FRM_PR10 bit 3 to 0), the framing and CRC bits
are regenerated by the transmit framer. The payload loopback is only available for ESF and CEPT modes.
7. The CNUCLB mode loops received system time slot X back to the system in time slot 0. The selected time slot
is not routed through the receive elastic store buffer and therefore will not be affected by system-AIS, RLFA
conditions, or controlled slips. Any time slot can be looped back to the system. Time slot X transmitted to the
line is not affected by this loopback mode. Looping received system time slot 0 has no effect on time slot 0
transmitted to the line, i.e., the transmit framer will always overwrite the FAS and NOT FAS data in time slot 0
transmitted to the line. This mode can be selected by setting register FRM_PR24 to 110A
4
A
3
A
2
A
1
A
0
and
register FRM_PR10 bit 3 to 1, where A
4
A
3
A
2
A
1
A
0
is the binary address of the selected time slot.
Secondary Loopback Modes
There are two secondary loopback modes supported:
1.
2.
The loopbacks are described in detail below:
1. The secondary-STSSLB mode loops one and only one received system time slot back to the transmit system
interface. The selected time-slot data looped back is not processed by either the transmit framer or the receive
framer. The selected time slot does not pass through the receive elastic store buffer and therefore will not be
affected by system-AIS, RLFA conditions, or controlled slips events. Whenever the secondary loopback register
is programmed to the same time slot as the primary register, the primary loopback mode will control that time
slot. Once selected, the desired time-slot position has the programmable line idle code in register FRM_PR22
transmitted to the line interface one frame before implementing the loopback and for the duration of the
loopback.
2. The secondary-STSLLB mode loops one and only one line time slot back to the line. The selected time slot data
is looped to the line after being processed by the receive framer and it passes through the receive elastic store.
The selected time slot has the programmable idle code in register FRM_PR22 transmitted to the system
interface one frame before implementing the loopback and for the duration of the loopback. In CEPT, selecting
time slot 0 has the effect of deactivating the current loopback mode while no other action will be taken (time slot
0 will not be looped back to the line and should not be chosen in this mode).
Secondary-single time-slot system loopback (S-STSSLB)
Secondary-single time-slot line loopback (S-STSLLB)
Table 45 defines the deactivation of the two secondary loopback modes as a function of the activation of the pri-
mary loopback and test transmission modes.
Table 45. Summary of the Deactivation of SSTSSLB and SSTSLLB Modes as a Function of Activating the
Primary Loopback Modes
Primary Loopback Mode
STSSLB
STSLLB
BLB
CNUBT
Deactivation of S-STSSLB
If primary time slot = secondary
If primary time slot = secondary
Always
If the secondary time slot is TS0 or if the
primary time slot = secondary
Always
If the secondary time slot is TS0 or if the
primary time slot = secondary
Always
Deactivation of S-STSLLB
If primary time slot = secondary
If primary time slot = secondary
Always
If primary time slot = secondary
LLB
NUCLB
Always
If primary time slot = secondary
PLLB
Always
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