Rainbow Electronics DS31256 - Manual (Page 179)

DS31256
179 of 181
15.2 Dual T3 with 256 HDLC Channel Support
Figure 15-5 shows an application where two T3 lines are interfaced to a single DS31256. The T3 lines are
demultiplexed by DS3112 M13 devices and passed to the DS21FF42 4 x 4 16-channel T1 framer and
DS21FT42 4 x 3 12-channel T1 framer devices. The T1 framers locate the frame and multiframe
boundaries and interface to the DS31256 by aggregating four T1 lines into a single 8.192MHz data
stream, which then flows into and out of the DS31256. The T1 lines can be either clear channel or
channelized.
Figure 15-5. Dual T3 Application
DS31256
ENVOY
DS21FF42
Four x Four
16-Channel
T1 Framer
DS21FT42
Four x Three
12-Channel
T1 Framer
DS21FF42
Four x Four
16-Channel
T1 Framer
DS21FT42
Four x Three
12-Channel
T1 Framer
DS3112
M13
Interface
1
2
16 T3
Line
#1
T3
Line
#2
Port 0
Port 1
Port 2
Port 3
17
18
28
Port 4
Port 5
Port 6
Port 7
1
2
16
17
18
28
Port 8
Port 9
Port 10
Port 11
Port 12
Port 13
Port 14
Port 15
DS3112
M13
Interface
DS3150
T3/E3
LIU
DS3150
T3/E3
LIU