TXC-06101AILQ Transwitch Corporation, TXC-06101AILQ Datasheet - Page 15

• 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

Path Overhead Definitions - POH
Path Overhead is assigned to a payload by a source device (DS3 mapping circuit, DS1 to STS-1 mux, etc.) and
remains with the payload until demultiplexed by the sink device. Intermediate LTEs may be required to monitor
these bytes. POH functions are divided into four classifications:
The definitions for the Path Overhead Bytes are given below.
Z1:
Z2:
E2:
Class A
Class B
Class C Application Specific Functions - The format and coding for these functions may not be
Class D Undefined Overhead functions - These overhead bytes are reserved for future use.
J1:
B3:
C2:
G1:
STS-N/Nc signal. The entire byte is used to convey a count of errors detected by B2 Bytes.
This count has (8 × N) + 1 legal values i.e., zero through (8 × N) errors. For rates below
STS-48/48c, the remaining possible 255-(8 × N) values are interpreted as zero errors. At
rates at and above STS-48/48c, if greater than 255 errors are detected the Line FEBE shall
relay a value of 255 errors.
Growth - In a signal at or above the STS-3/3c level and less than the STS-192/192c rate, one
byte is reserved in STS-1 numbers two through N of the STS-N/Nc signal for future growth.
At rates greater than or equal to STS-192/192c, Z1 is only defined for STS-1 numbers two
through 48.
Growth - In a SONET signal at or above the STS-3/3c level and at or less than
STS-192/192c, one byte is reserved in all STS-1s except for STS-1 number three of the
STS-N/Nc signal for future growth. At rates greater than or equal to STS-192/192c, Z2 is only
defined for STS-1 numbers one, two, and four through 48.
Orderwire - One byte is allocated to be used as a Line Orderwire. This is an express order-
wire channel reserved for voice communications between LTEs. It is only defined for STS-1
number one.
Payload Independent Functions - These functions have a standard format and coding and
are required for all PTEs.
Mapping Dependent Functions - These functions have a standard format and coding that are
specific to the type of payload. They are needed for more than one type of payload but not
necessarily all payloads. These functions are processed by the appropriate PTEs.
defined in the SONET Standards. These functions are processed by the appropriate PTEs.
Path Trace; Class A - One byte is used to repetitively transmit a 64-byte fixed length string so
that a sink device can verify its continued connection to the intended source device. The con-
tent of the message is not constrained by the SONET Standards. However, it is suggested
that a message consisting of eight-bit ASCII characters, padded with NULL Characters, and
terminated with CR and LF (total length 64 bytes) would be appropriate. If no message is
designated then 00[H] is to be transmitted.
Path BIP-8; Class A - One byte is allocated for a Path Error Monitoring function. This function
is a bit interleaved parity 8 code using even parity. The Path BIP-8 is calculated over all bits of
the previous STS SPE before scrambling. The computed BIP-8 is placed in the B3 Byte
before scrambling.
Path Signal Label; Class A/B - One byte is allocated to identify the construction and content
of the SPE and for a Path Payload Defect Indicator (PDI-P). The Signal Label portion is a
class A function. PDI-P is class B.
Path Status; Class A - One byte is allocated to convey back to the Source PTE the Sink PTE
status and performance. Bits 1 through 4 are a Path FEBE. These bits are used to convey the
Proprietary TranSwitch Corporation Information for use Solely by its Customers
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DATA SHEET
TXC-06101
Ed. 3, April 2001
TXC-06101-MB
PHAST-1