PEB2096 SIEMENS [Siemens Semiconductor Group], PEB2096 Datasheet - Page 15

• Manufacturer Part Number: PEB2096
• Description: Octal Transceiver for UPN Interfaces OCTAT-P
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Within a burst, the data rate is 384 kbit/s. The 38-bit frame structure is as shown in
figure 5. The framing bit (LF) is always logical ‘1’. The frame also contains the user
channels (2B + D).
It can readily be seen that in the 250 s burst repetition period, 4 D bits, 16 B1 bits and
16 B2 bits are transferred in each direction. This results in an effective full duplex data
rate of 16 kbit/s for the D channel and 64 kbit/s for each B channel.
The final bit of the frame is called the M bit. It´s data rate is 4 kbit/s. Four successive
M bits, from four successive U frames, constitute a superframe. Three signals are
carried in this superframe. Every fourth M bit is a code violation (CV) and is used for
superframe synchronization. This can be regarded as the first bit of the superframe.
Figure 5
U
Semiconductor Group
P0
TE/PT
Interface Frame Structure (= U
LT
t
d
LF
1
B1
8
1)
2)
M Channel Superframe
CV = Code Violation: for Superframe synchronization
t = Transparent Channel (2
S = Service Channel (1
DC balancing bit, only sent after a code violation in the
M-bit position and in special configurations.
Timings:
B2
8
t
t
t
t
g
PN
r
d
g
=burst repetition period
=line delay
=guard time
t
r
)
LF-Framing Bit
15
99 s
D
4
kbit/s)
= 20.8
= 5.2 s
kbit/s)
s
minimum
CV T S T CV T S T CV
maximum
= 250
B1
8
s
t
d
B2
8
PEB 2096
ITD00823
M DC
1 #Bits
1
)
01.96
2)