TXC-06101AILQ Transwitch Corporation, TXC-06101AILQ Datasheet - Page 19

• Manufacturer Part Number: TXC-06101AILQ
• Manufacturer: Transwitch Corporation

Specifications of TXC-06101AILQ

• Operating Temperature (min): -40C
• Operating Temperature Classification: Industrial
• Operating Temperature (max): 85C
• Package Type: PQFP
• Rad Hardened: No
• Lead Free Status / Rohs Status: Not Compliant

Proprietary TranSwitch Corporation Information for use Solely by its Customers
PHAST-1
DATA SHEET
TXC-06101
New Data Flag
Bits 1 through 4 (N Bits) of the Pointer Word carry a New Data Flag (NDF). This is a mechanism that allows an
arbitrary change of the value of the pointer if that change is due to a change in payload. Normal operation is
indicated by a "0110" code in the N Bits. NDF is indicated by inversion of the N Bits to "1001". The new align-
ment is indicated by the pointer value accompanying the NDF and takes effect at the offset indicated.
Concatenation
A concatenation indication contained in the Pointer Word is used to show that the STS-1 is part of an STS-Nc.
The operations indicated in the pointer word of the first STS-1 within the STS-Nc apply to all STS-1s within the
group. The pointer value must be multiplied by N to obtain the byte offset into the STS-Nc envelope capacity.
Positive and negative justifications are performed as N byte multiples. In the remaining pointer words in the
group the I and D Bits are set to all "1"s. The N Bits are set to "1001" and the S Bits are set to "00". The
PHAST-1 does not support concatenation but does provide a status bit indicating that a concatenation indica-
tion has been received in the H1 and H2 Bytes.
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TXC-06101-MB
Ed. 3, April 2001