TXC-04222-AIOG Transwitch Corporation, TXC-04222-AIOG Datasheet - Page 53

• Manufacturer Part Number: TXC-04222-AIOG
• Manufacturer: Transwitch Corporation

Specifications of TXC-04222-AIOG

• Screening Level: Industrial
• Package Type: BGA
• Lead Free Status / Rohs Status: Not Compliant

DROP AND ADD TU/VT SELECTION
There are four VT/TU selection registers per channel. Two registers are used for selecting the VT1.5/TU-11 or
VT2/TU-12 (VT2) for the A and B drop buses, and the other two registers are used for selecting the
VT1.5/TU-11 or VT2/TU-12 (VT2) for the A and B Add buses. Thus, two different VT/TUs can be assigned to
the A and B drop buses, and two different VT/TUs can be assigned to the A and B add buses for channel n. In
addition, broadcast capability is supported in the drop direction. This feature permits the same VT/TU to be
dropped to more than one channel. In the add direction only one channel can be used for the broadcast mode.
Each selection register consists of eight bits, which is programmed according to the following table. A 00H
forces a high impedance state at the receive interface for channel n. In addition, the REI and RDI states will be
transmitted as zeros. Any unlatched Drop Bus channel alarms that are set in a channel will remain set when 00
is written into that channel’s Drop VT selection register regardless of a change in the alarm condition. In the
add direction, a 00H or invalid value forces a high impedance state for that channel. The register assignment
for the A side drop bus is: X+012H, A side add bus is: X+01AH, B side drop bus is: X+082H, and the B add bus
is: X+08AHB, where X is the channel number (1 to 28) in hex. When changing the value of an Add Bus per
channel VT selection register, 00H should be written into the register first, followed by the new channel assign-
ment value. When changing the value of a Drop Bus per channel VT Selection Register, 00H should be written
into the register, followed by the new channel assignment value. If another channel has been assigned the
same value, then nothing else needs to be done. If no other channel has been assigned the same value, then
a Drop Bus A or B per channel reset (control bit DACHnR or DBCHnR) operation should be performed for the
channel whose VT selection register has been modified.
TU/VT
Type
7
0
0
1
AU-3/TUG-3 or
6
0
0
0
1
1
Proprietary TranSwitch Corporation Information for use Solely by its Customers
STS-1
5
0
0
1
0
1
TU/VT Group Number
4
0
0
0
0
1
1
1
1
A and B Drop and Add VT/TU Selection
3
0
0
1
1
0
0
1
1
DATA SHEET
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2
0
1
0
1
0
1
0
1
TU/VT Number
1
0
0
1
1
0
0
0
1
0
1
0
AU-3/TUG-3 A, STS-1 #1
AU-3/TUG-3 B, STS-1 #2
AU-3/TUG-3 C, STS-1 #3
TU/VT Group Number 1
TU/VT Group Number 2
TU/VT Group Number 3
TU/VT Group Number 4
TU/VT Group Number 5
TU/VT Group Number 6
TU/VT Group Number 7
(VT1.5/TU-11 format)
VT1.5/TU-11 Format
No TU/VT Selected
VT2/TU-12 Format
TU/VT Number 1
TU/VT Number 2
TU/VT Number 3
TU/VT Number 4
Not used
Meaning
TXC-04222-MB, Ed. 6
TXC-04222
TEMx28
June 2003