Rainbow Electronics DS31256 - Manual (Page 181)

DS31256
181 of 181
15.4 Single T3 with 672 HDLC Channel Support
Figure 15-7 shows an application where a fully channelized T3 line is interfaced to three DS31256s. The
T3 line is demultiplexed by the M13 block and passed to the DS21FF42 and DS21FT42 devices. The T1
framers locate the frame and multiframe boundaries and interface to the DS31256. Aggregating four T1
lines into a single 8.192MHz data stream is not required since the DS31256 has enough physical ports to
support the applicationm, but aggregation could be done to cut down on the number of electrical
connections between the DS31256 and the T1 framers. The T1 lines can be either clear channel or
channelized.
Figure 15-7. T3 Application (672 HDLC Channels)
DS31256
ENVOY #1
(Supports 10
T1 Lines)
DS21FF42
Four x Four
16-Channel
T1 Framer
DS21FT42
Four x Three
12-Channel
T1 Framer
M13
Interface
1
2
16
Port 0
Port 1
Port 2
Port 3
17
18
28
Port 4
Port 5
Port 6
Port 7
Port 8
Port 9
Port 10
Port 11
Port 12
Port 13
Port 14
Port 15
Port 0
Port 1
Port 2
Port 3
Port 4
Port 5
Port 6
Port 7
Port 8
Port 9
Port 10
Port 11
Port 12
Port 13
Port 14
Port 15
Port 0
Port 1
Port 2
Port 3
Port 4
Port 5
Port 6
Port 7
Port 8
Port 9
Port 10
Port 11
Port 12
Port 13
Port 14
Port 15
DS3112
DS31256
ENVOY #2
(Supports 10
T1 Lines)
DS31256
ENVOY #3
(Supports 8
T1 Lines)