pef82902 Infineon Technologies Corporation, pef82902 Datasheet - Page 94

• Manufacturer Part Number: pef82902
• Description: 4b3t Second Generation Modular Isdn Nt Intelligent Extended
• Manufacturer: Infineon Technologies Corporation

2.5.2
According to ITU recommendation I.430 a multi-frame provides extra layer-1 capacity in
the TE-to-NT direction through the use of an extra channel between the TE and NT (Q-
channel). The Q bits are defined to be the bits in the F
In the NT-to-TE direction the S-channel bits are used for information transmission.
The S- and Q-channels are accessed via µC by reading/writing the SQR or SQX bits in
the S/Q channel registers (SQRR, SQXR).
Table 24
Table 24
Frame Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
1
2
The S-transceiver starts multiframing if SQXR1.MFEN is set.
After multi-frame synchronization has been established in the TE, the Q data will be
inserted at the upstream (TE
Data Sheet
shows the S and Q bit positions within the multi-frame.
S/Q Channels, Multiframing
S/Q-Bit Position Identification and Multi-Frame Structure
NT-to-TE
F
ONE
ZERO
ZERO
ZERO
ZERO
ONE
ZERO
ZERO
ZERO
ZERO
ONE
ZERO
ZERO
ZERO
ZERO
ONE
ZERO
ZERO
ZERO
ZERO
ONE
ZERO
A
Bit Position
NT) F
NT-to-TE
M Bit
ONE
ZERO
ZERO
ZERO
ZERO
ZERO
ZERO
ZERO
ZERO
ZERO
ZERO
ZERO
ZERO
ZERO
ZERO
ZERO
ZERO
ZERO
ZERO
ZERO
ONE
ZERO
A
bit position by the TE in each 5th S/T frame, the
80
NT-to-TE
S Bit
S11
S21
S31
S41
S51
S12
S22
S32
S42
S52
S13
S23
S33
S43
S53
S14
S24
S34
S44
S54
S11
S21
A
bit position.
Functional Description
TE-to-NT
F
Q1
ZERO
ZERO
ZERO
ZERO
Q2
ZERO
ZERO
ZERO
ZERO
Q3
ZERO
ZERO
ZERO
ZERO
Q4
ZERO
ZERO
ZERO
ZERO
Q1
ZERO
A
Bit Position
PEF 81902
2001-11-12