參數(shù)資料
型號(hào)： T7698
廠商： Lineage Power
英文描述： Quad T1/E1 Line Interface and Octal T1/E1 Monitor(四T1/E1線接口和八T1/E1監(jiān)控器)
中文描述： 四T1/E1線路接口和八路的T1/E1監(jiān)視器（四個(gè)T1/E1線接口和八T1/E1的監(jiān)控器）
文件頁(yè)數(shù)： 64/112頁(yè)
文件大?。?/td> 1359K
代理商： T7698
Data Sheet
January 1999
T7698 Quad T1/E1 Line Interface and Octal T1/E1 Monitor
64
Lucent Technologies Inc.
Frame Monitors
(continued)
Frame Formats
(continued)
CRC-4 Multiframe Alignment Search Algorithm with 400 ms Timer.
This receive CRC-4 multiframe reframe
mode is the modified CRC-4 multiframe alignment algorithm described in ITU Rec. 706 Annex B, where it is
referred to as CRC-4-to-non-CRC-4 equipment interworking. A flow diagram of this algorithm is illustrated in
Figure 21. This algorithm assumes that a valid basic frame alignment signal is consistently present but the CRC-4
multiframe alignment cannot be achieved by the end of the total CRC-4 multiframe alignment search period of
400 ms when the distant end is non-CRC-4 equipment. In this mode, the following consequent actions should be
taken by the receiving equipment.
1.
2.
An indication that there is no incoming CRC-4 multiframe alignment signal.
All CRC-4 processing on the receive
2.048 Mbits/s signal is inhibited.
As described in ITU Rec. G.706, Section B.2.3:
1.
2.
A 400 ms timer is triggered on the initial recovery of the primary basic frame alignment.
The 400 ms timer is reset if and only if the criteria for loss of basic frame alignment, as described in ITU Rec.
G.706 Section 4.1.1, is achieved.
A new search for frame alignment is initiated if CRC-4 multiframe alignment cannot be achieved in 8 ms as
described in ITU Rec. G.706, Section 4.2. This new search for basic frame alignment will not reset the 400 ms
timer or invoke consequent actions associated with loss of the primary basic frame alignment. In particular, all
searches for basic frame alignment are carried out in parallel with, and independent of, the primary basic frame
loss checking process. All subsequent searches for CRC-4 multiframe alignment are associated with each
basic framing sequence found during the parallel search.
During the search for CRC-4 multiframe alignment, traffic is allowed through upon, and synchronized to, the
initially determined primary basic frame alignment.
Upon detection of the CRC-4 multiframe before the 400 ms timer elapsing, the basic frame alignment associ-
ated with the CRC-4 multiframe alignment replaces, if necessary, the initially determined basic frame align-
ment.
If CRC-4 multiframe alignment is not found before the 400 ms timer elapses, it is assumed that a condition of
interworking between equipment with and without CRC-4 capability exists.
3.
4.
5.
6.
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