IDT82P2284 Integrated Device Technology, Inc., IDT82P2284 Datasheet - Page 42

• Manufacturer Part Number: IDT82P2284
• Description: 4 Channel T1/J1/E1 Transceiver
• Manufacturer: Integrated Device Technology, Inc.

IDT82P2284
Functional Description
errors in
second
> 914
CRC
one
alignment pattern if CRCEN =
1 (refer to CRC Multi-Frame)
search for CRC Multi-Frame
alignment patterns within 8ms, with the
interval time of each pattern being a
OOCMFV = 0, OOFV = 0 CRC
find 2 CRC Multi-Frame
acquired; Start CRC and
CRC Multi-Frame sync.
to CRC interworking
E-bits processing;
multiple of 2ms
Start 8ms and
400ms timer
Yes
search for Basic Fframe alignment patten
(refer to Basic Frame)
Figure 9. E1 Frame Searching Process
No, and
No, and
Basic Frame sync. acquired
expired
expired
OOSMFV = 1, OOOFV = 0
OOFV = 1, OOCMFV = 1,
Start to check FAS errors
8ms
8ms
Yes
Yes
Yes
alignment patterns within 8ms, with the
(N+1) frame
find NFAS in
(N+2) frame
Out of sync.
interval time of each pattern being a
find FAS in
find FAS in
OOFV = 0
N frame
th
Basic Frame sync. acquired
th
th
Lock the Sync. Position
Yes
find 2 CRC Multi-Frame
31
search OOOFV = 1
Start Offline Frame
Yes
Yes
Yes
Start 8ms timer
multiple of 2ms
(n+2) frame
find NFAS in
(n+1) frame
OOOFV = 0
No (N=N+1)
No (N=N+3)
frame, N=N+3)
find FAS in
find FAS in
QUAD T1/E1/J1 LONG HAUL / SHORT HAUL TRANSCEIVER
No (skip one
n frame
th
th
th
No (n = n+1)
frame, n=n+3)
No (skip one
No (n=n+3)
search for Signaling Multi-Frame
alignment if CASEN = 1 (refer to
Signaling Multi-Frame)
errors (criteria selected by the
BIT2C) or manually re-frame
3 consecutive FAS or NFAS
basic frame sync.
No, and 400ms
expired with
Sync conditions which criteria
of Signaling Multi-Frame
are set in the SMFASC
Multi-Frame alignment
Multi-Frame sync.
No
No
Stop CRC processing if
find Signaling
check for out
Signaling
& TS16C
acquired
CRC to non-CRC
pattern
C2NCIWCK = 0
C2NCIWV = 1
interworking
Yes
Yes
March 22, 2004