82P2284BB IDT, Integrated Device Technology Inc, 82P2284BB Datasheet - Page 44

• Manufacturer Part Number: 82P2284BB
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 82P2284BB

• Screening Level: Industrial
• Mounting: Surface Mount
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Not Compliant

3.8.2.1 Synchronization Searching
Basic Frame
pattern (as shown in Figure 12) meets the ITU-T Recommendation
G.706 4.1.2 and 4.2.
sequence. If STEP 2 is not met, a new searching will start after the
following frame is skipped. If STEP 3 is not met, a new searching will
start immediately in the next frame. Once the Basic Frame alignment
pattern is detected in the received PCM data stream, the Basic Frame
synchronization is found and the OOFV bit will be set to ‘0’ for indication.
Functional Description
IDT82P2284
The algorithm used to search for the E1 Basic Frame alignment
Generally, it is performed by detecting a successive FAS/NFAS/FAS
44
QUAD T1/E1/J1 LONG HAUL / SHORT HAUL TRANSCEIVER
one frame,
No (skip
N=N+3)
Figure 12. Basic Frame Searching Process
2nd bit of TS0 of the (N+1) frame to ensure
that this is a non-frame alignment
the correct 7-bit FAS (X0011011)
Sequence (FAS) (X0011011)
STEP 2: Find logic 1 in the
for 7-bit Frame Alignment
in the TS0 in the (N+2)
Synchronization Found
Yes
STEP 3: Search for
sequence (NFAS)
STEP1: Search
in the N frame
Basic Frame
Yes
Yes
frame
th
th
th
No (N=N+1)
February 25, 2008
(N=N+3)
No