YTD439 Datasheet, PDF (9/15 Pages) List of Unclassifed Manufacturers – ISDN BRI controller for Terminal Equipment with built-in DSU

TD Switch Block
The TD switch block consists of the time-division switch. It allows the replacement of
data of each channel on the PCM highway. By using the TD switch, the switch control of
B channel data can be facilitated on terminals with multi-functionality such as
extensions, three-way calls, and holding tone.
YTD439 supports 512 kHz to 2,048 kHz PCM highway and can perform switching on 8
channels. You can specify which output channels to connect the 8 channels of input
through the I/O register. One-to-one connection and one-to-multi-point connections are
supported.
The B channel data control block and the layer 1 control block (B channel data) are
connected to the PCM highway internally in the YTD439, and two channels are used by
each. The remaining four channels are connected to the PCM highway pins and allows
connection to arbitrary channels such as an external CODEC.
Input PCM Highway
SYNC_IN pin
(8 kHz)
HW_IN pin
(512 k - 2,048 kHz)
Time
slot 0
Time
slot 1
Time
slot 2
Time
slot 3
Time
slot 4
Time
slot n-1
Time
slot n
n:7 (Min.) - 31 (Max.)
B-ch data control block
(CH-A) (CH-B)
Layer 1 control
block
(B1) (B2)
REG1
TD switch block
TDSW input CHI_0
CHI_1
CHI_2
CHI_3
CHI_4
CHI_5
CHI_6
CHI_7
REGX5a-h
TDSW output CHO_0 CHO_1 CHO_2 CHO_3 CHO_4 CHO_5 CHO_6 CHO_7
Output PCM Highway
HW_OUT pin
(512 k - 2,048 kHz)
SYNC_OUT pin
(8 kHz)
Time
slot 0
Time
slot 1
Time
slot 2
REG1
B-ch data control block
(CH-A) (CH-B)
Layer 1 control
block
(B1) (B2)
Time
slot 3
Time
slot 4
Time
slot n-1
Time
slot n
n:7 (Min.) - 31 (Max.)
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