82P2281PFG8 IDT, Integrated Device Technology Inc, 82P2281PFG8 Datasheet - Page 65

• Manufacturer Part Number: 82P2281PFG8
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 82P2281PFG8

• Number Of Transceivers: 1
• Screening Level: Industrial
• Mounting: Surface Mount
• Package Type: TQFP
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Compliant

IDT82P2281
selecting the G56K & GAP bits in the Receive Payload Control. The data
in the corresponding gapped duration is a don't care condition.
3.17.1.2
1.544 Mb/s or 2.048 Mb/s. If the system data rate is 1.544 Mb/s, it works
in T1/J1 mode. If the system data rate is 2.048 Mb/s, the received data
stream (1.544 Mb/s) should be mapped to the same rate as the system
side, that is, to work in T1/J1 mode E1 rate. Three kinds of schemes are
provided by selecting the MAP[1:0] bits:
Channel 15 of Frame N from the device are converted into TS1 to TS15
of Frame N on the system side; Channel 16 to Channel 24 of Frame N
from the device are converted into TS17 to TS25 of Frame N on the sys-
tem side. The F-bit of Frame N from the device is converted into the first
bit of TS26 of Frame (N-1) on the system side. TS0, TS16, TS27~TS31
Functional Description
1.544
2.048
Mb/s
Mb/s
1.544
2.048
Mb/s
Mb/s
In the Receive Clock Slave mode, the system data rate can be
1. T1/J1 Mode E1 Rate per G.802 (refer to Figure 18): Channel 1 to
filler
F
TS0
filler
Receive Clock Slave Mode
F
CH1
TS0
the 8th bit
CH1
TS1
Figure 19. T1/J1 To E1 Format Mapping - One Filler Every Fourth Channel Mode
TS1
CH2
CH2
TS2
TS2
CH3
TS3
Figure 18. T1/J1 To E1 Format Mapping - G.802 Mode
CH14
CH4
TS14 TS15 TS16 TS17 TS18
TS4
filler
CH15
CH5
TS5
TS6
CH16
CH6
filler
TS7
CH7
CH17
65
TS8
filler
SINGLE T1/E1/J1 LONG HAUL / SHORT HAUL TRANSCEIVER
and the other 7 bits in TS26 on the system side are all filled with ‘0’s and
they are meaningless.
Figure 19): One dummy byte is inserted on the system side before 3
bytes of Frame N from the device are converted. This process repeats 8
times and the conversion of Frame N of 1.544 Mb/s data rate to 2.048
Mb/s data rate is completed. However, the F-bit of Frame N of the 1.544
Mb/s data rate is inserted as the 8th bit of Frame N of the 2.048 Mb/s
data rate. The dummy bytes are filled with all ‘0’s and they are meaning-
less.
Channel 1 to Channel 24 of Frame N from the device are converted into
TS1 to TS24 of Frame N on the system side. The F-bit of Frame N from
the device is converted into the 8th bit of Frame N on the system side.
The first 7 bits and TS25 to TS31 on the system side are all filled with
‘0’s and they are meaningless.
2. T1/J1 Mode E1 Rate per One Filler Every Fourth CH (refer to
3. T1/J1 Mode E1 Rate per Continuous CHs (refer to Figure 20):
TS9
CH23
CH22
TS24 TS25
TS28 TS29 TS30 TS31
filler
CH24
CH23
the 1st bit
F
CH24
TS26 TS27~TS31
CH1
filler
F
CH2
CH1
filler
filler
TS0
the 8th bit
CH2
August 20, 2009
TS0
filler
TS1
CH23
TS1