Manual

DS3170 DS3/E3 Single-Chip Transceiver
41 of 233
Figure 7-10
shows the relationship between the DS3 transmit overhead port pins.
Figure 7-10. DS3 Framing Transmit Overhead Port Timing
TOH
TOHSOF
TOHCLK
F74C73F73
1234567891011121314 16171819202122232415
F11
X1 F13C12F12 C13 F14 F21
C21
X2
F23C22
F22
C23 F24
F31 C31P1 C32F32
TOHEN
C11
Figure 7-11
shows the relationship between the E3 G.751 transmit overhead port pins.
Figure 7-11. E3 G.751 Framing Transmit Overhead Port Timing
TOH
TOHSOF
TOHCLK
NA
FAS
10
1234567891011121314 16171819202122232415
FAS
2
FAS
3
FAS
1
FAS
6
FAS
5
FAS
4
FAS
7
FAS
8
FAS
10
A
FAS
9
FAS
2
FAS
1
N
FAS
3
FAS
4
FAS
6
FAS
8
FAS
5
FAS
9
FAS
9
TOHEN
Figure 7-12
shows the relationship between the E3 G.832 transmit overhead port pins.
Figure 7-12. E3 G.832 Framing Transmit Overhead Port Timing
TOH
TOHCLK
GC
8
GC
7
GC
6
1234567891011121314 16171819202122232415
FA1
2
FA1
3
FA1
1
FA1
6
FA1
5
FA1
4
FA1
7
FA1
8
FA2
2
FA2
3
FA2
1
FA2
6
FA2
5
FA2
4
FA2
7
FA2
8
EM
2
EM
3
EM
1
EM
5
EM
4
TOHSOF
TOHEN
7.3.3 DS3/E3 Serial Data Interface
7.3.3.1 DS3/E3 Framed Mode Transmit Serial Interface Pin Functional Timing
The TSER pin is used to input DS3 or E3 payload data bits in all framing modes as well as the C-bits, which can be
treated as payload, in DS3 M23 and E3 G.751 framing modes. The TDEN signal is used to determine the DS3 or
E3 payload bit positions on TSER. The TDEN signal goes high three clocks before the first bit of a payload
sequence is clocked into the TSER pin and it goes low three clocks before the payload sequence is stopped being
clocked in to the TSER pin. The TSOFO signal pulses high three clocks before the start of the DS3 or E3 overhead
bit position on TSER. The TSOFI pin is used to set the DS3 or E3 frame position. When the TSOFI pin transitions
low to high, the first DS3/E3 overhead bit position on TSER will be forced to align to it
Figure 7-13
to Figure 7-15 show the relationship between the transmit serial interface pins.