Ambassador T8100A, T8102, and T8105
H.100/H.110 Interfaces and Time-Slot Interchangers
Advance Data Sheet
November 1999
2 Architecture and Functional Description (continued)
2.6 Interface Section (continued)
2.6.3 Framing Groups
The framing group signals are another feature of the T8100A/02/05 devices. With the 11-bit offset, the start of the
first frame pulse can be positioned anywhere within the frame: therefore, simply defining the start of a virtual frame.
Since there are 12 signals for each group and there are two groups, the user has great flexibility when interfacing to
other telephony cards.
Two groups of frame pulses are available. Each frame group consists of 12 lines which are enabled sequentially
after a programmed starting point. They are denoted as group A and group B. This section describes framing
group A. Framing group B is made up of similar registers. Each frame group is controlled by a pair of registers:
FRHA and FRLA control the spacing of the 12 frame pulses, their pulse width, polarity, and the offset of the first
pulse from the frame boundary.
Table 55. FRHA, Frame Group A High Address and Control, 0x21
Reg
R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
FRHA
—
Rate
Type
FAI
Hi Start
Symbol
Bit
Description
Rate
7—6
Rate
=
=
=
=
00,
01,
10,
11,
Frame group disabled, 3-state.
2.048 Mbits/s.
4.096 Mbits/s.
Rate
Rate
Rate
8.192 Mbits/s.
Type
5—4
Type
Type
Type
Type
=
=
=
=
00,
01,
10,
11,
Bit-wide pulse.
Double bit-wide pulse.
Byte-wide pulse.
Double byte-wide pulse.
FAI
3
FAI
FAI
=
=
0,
1,
Normal pulse.
Inverted pulse.
Hi Start 2—0
Hi Start =
Upper 3 bits of group start address or programmed output.
Table 56. FRHB, Frame Group B High Address and Control, 0x23
Reg
R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
FRHB
—
Rate
Type
FAI
Hi Start
Symbol
Bit
Description
Rate
7—6
Rate
=
=
=
=
00,
01,
10,
11,
Frame group disabled, 3-state.
2.048 Mbits/s.
4.096 Mbits/s.
Rate
Rate
Rate
8.192 Mbits/s.
Type
5—4
Type
Type
Type
Type
=
=
=
=
00,
01,
10,
11,
Bit-wide pulse.
Double bit-wide pulse.
Byte-wide pulse.
Double byte-wide pulse.
FAI
3
FAI
FAI
=
=
0,
1,
Normal pulse.
Inverted pulse.
Hi Start 2—0
Hi Start =
Upper 3 bits of group start address.
Lucent Technologies Inc.
59
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