參數(shù)資料
型號: T7264
廠商: Lineage Power
英文描述: U-Interface 2B1Q Transceiver(U接口 2B1Q收發(fā)器)
中文描述: U型接口2B1Q收發(fā)器(ü接口2B1Q收發(fā)器)
文件頁數(shù): 31/54頁
文件大?。?/td> 876K
代理商: T7264
Lucent Technologies Inc.
31
Data Sheet
April 1998
T7264 U-Interface 2B1Q Transceiver
Activation and the K2 Interface
(continued)
There is one case in which the LT never receives act = 1
from the NT. If the LT is connected to an NT1, which
has no TE controlling it, the NT can never send act = 1.
T1.601 (Section 6.4.6.6) states that transparency
required to perform loopbacks must be provided
when loopbacks are requested, even when the NT is
not sending act = 1. In this case, the LT, once it has
received oof = 1, must transmit the proper eoc message
to enable the desired remote loopback. The NT1 must
set its xpcy = 0 in response to the eoc loopback
message. Upon receiving the echoed message from
the NT, the LT must set xpcy = 0. Now, transparency is
established over the entire link without having set the
act bits to 1.
Upon receiving act = 1 three consecutive times from
the LT, or upon receiving an eoc loopback message as
discussed above, the NT sets its xpcy = 0, affecting
2B+D transparency in the upstream direction over the
entire link. Prior to this, the NT transceiver was inter-
nally overwriting the upstream 2B+D data to all 1s per
T1.601. The link is now fully operational.
Table 23. Definitions of Signals During Start-Up
* Tones have alternating pattern of four +3s, followed by four –3s, and no SW.
See Figure 21 for start and/or stop time of this signal.
Signals SN3 and SL3 continue indefinitely (or until deactivation).
Notes:
TN, TL
Tones produced by NT or LT, respectively.
SNx, SLx —
Pulse patterns produced by NT or LT, respectively.
Tx
Notation refers to transition instants defined in Figure 21.
Absent
Under superframe, this notation means that only SW is transmitted, not ISW.
Normal
Normal means that the M bits are transmitted onto the 2-wire line as required during normal operation (e.g., valid crc bits, eoc
bits, and indicator bits are transmitted).
Normal+
Except to perform a loopback, 2B+D bits remain in the previous state (SN2 or SL2) until both act bits indicate full transparency
of the B- and D-channels (i.e., the 2B+D bits of SN3 and SL3 must remain set to 1 and 0, respectively, until transparency is
achieved at both ends of the DSL).
Priority
Priorities exist for responding to several signals as follows:
1. RESET
2. afrst
3. ILOSS
4. tone detection
5. istp
6. lpbk
Signal
Sync Word
(SW)
±
3*
Present
Present
Present
Superframe
(ISW)
±
3*
Absent
Absent
Present
2B+D
M
Start
Stop
Time
(Frames)
TN
±
3*
1
1
±
3*
1
1
6
SN1
SN2
SN3
T1
T5
T6
T2
T6
Normal
+
±
3*
1
0
Normal
TL
SL1
SL2
SL3
±
3*
±
3*
±
3*
1
2
Present
Present
Present
Absent
Present
Present
T3
T4
T7
T4
T7
Normal
Normal
Normal
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