363-206-295
A SONET Overview
A-8
Issue 1
December 1997
Path Overhead
1
There are two types of path overheads:
— STS-1 path overhead
— VT path overhead.
STS-1 Path Overhead
1
The STS-1 path overhead is assigned to and remains with the STS-1 SPE until
the payload is extracted and is used for functions that are necessary to transport
all synchronous payload envelopes.
■
STS-1 Path Trace (J1)
— Repetitively transmits a 64 byte, fixed length, string so that an STS-1
path receiving terminal can verify its continued connection to the
intended transmitter.
■
STS-1 Path Bit-Interleaved Parity (BIP-8) (B3)
— Provides each STS-1 path performance monitoring. This byte is
calculated over all bits of the previous STS-1 SPE before
scrambling.
■
STS-1 Path Signal Labels (C2)
— Indicates the construction of the STS-1 SPE. A value of 00000000
indicates an unequipped STS-1 SPE. Values for various payload
mappings are defined in TR-NWT-000253, Issue 2.
■
STS-1 Path Status (G1)
— Conveys the STS-1 path terminating status, far end block errors
(FEBE), and yellow alarm signal conditions back to an originating
STS-1 path terminating equipment.
■
STS-1 Path User Channel (F2, F3)
— User communication channel between Path elements.
■
VT Multiframe Indicator (H4)
— Provides a general multiframe indicator for VT-structured payloads.
■
STS-1 Path Automatic Protection Switching (K3)
— Path Automatic Protection Switching
■
TCM - Tandem Connection Maintenance (N1)
— Bits 1-4 used for incoming error monitoring. Bits 5-8 used as
communications channel.
Содержание DDM-2000 OC-12
Страница 1: ...363 206 295 Issue 1 December 1997 DDM 2000 OC 12 Multiplexer Release 7 0 User Service Manual Volume I ...
Страница 37: ...Tables xxxviii Issue 1 December 1997 A A SONET Overview A 1 SONET Payloads A 18 A 2 SONET Transport Rates A 19 ...
Страница 506: ...INS PROG 8 of 8 Page INS PROG COMMANDS RELATED rtrv eqpt rtrv ne OC 12 DDM 2000 1997 December 1 Issue 11 89 ...
Страница 528: ...RTRV ATTR ALM 2 of 2 Page RTRV ATTR ALM COMMANDS RELATED set attr alm OC 12 DDM 2000 1997 December 1 Issue 11 111 ...
Страница 565: ...RTRV OC3 3 of 3 Page RTRV OC3 COMMANDS RELATED rtrv sync 11 148 1997 December 1 Issue OC 12 DDM 2000 ...
Страница 664: ...SET FEAT 3 of 3 Page SET FEAT COMMANDS RELATED rtrv feat OC 12 DDM 2000 1997 December 1 Issue 11 247 ...
Страница 766: ... Ctl T TOGGLE 2 of 2 Page Ctl T TOGGLE COMMANDS RELATED logout rlgn OC 12 DDM 2000 1997 December 1 Issue 11 349 ...
Страница 847: ...Multiplexer OC 12 DDM 2000 7 Release TARP TOP Manual User Service II Volume 363 206 295 1 Issue 1997 December ...
Страница 867: ...363 206 295 TOP Maintenance and Operation BLANK LEFT INTENTIONALLY PAGE THIS 12 1997 December 1 Issue ...
Страница 1145: ...Order Circuit 363 206 295 NTP 029 1 of 1 Page 1997 December 1 Issue Unused LISTED ORDER IN BELOW ITEMS DO TO GO DETAILS FOR ...
Страница 1146: ...Order Circuit 363 206 295 NTP 030 1 of 1 Page 1997 December 1 Issue Unused LISTED ORDER IN BELOW ITEMS DO TO GO DETAILS FOR ...
Страница 1182: ...Turnup System 363 206 295 NTP 033 1 of 1 Page 1997 December 1 Issue Unused LISTED ORDER IN BELOW ITEMS DO TO GO DETAILS FOR ...
Страница 1243: ...Clearing Trouble 363 206 295 TAP 107 1 of 1 Page 1997 December 1 Issue Unused ...
Страница 1393: ...363 206 295 DLP 513 1 of 1 Page 1997 December 1 Issue Unused ...
Страница 1394: ...363 206 295 DLP 514 1 of 1 Page 1997 December 1 Issue Unused ...
Страница 1456: ...363 206 295 DLP 523 7 of 7 Page 1997 December 1 Issue OC 12 via Access Broadcast Video for Cross connections of Example 4 Figure ...
Страница 1465: ...DLP 525 363 206 295 1997 December 1 Issue 6 of 2 Page Schematic Ring Virtual ATM Sample 1 Figure ...
Страница 1469: ...DLP 525 363 206 295 1997 December 1 Issue 6 of 6 Page Ring Virtual ATM OC 12 DDM 2000 for Cross connections of Example 4 Figure ...
Страница 1565: ...363 206 295 DLP 543 6 of 5 Page 1997 December 1 Issue Network Broadcast Video of Test Transmission 2 Figure ...
Страница 1566: ...DLP 543 363 206 295 1997 December 1 Issue 6 of 6 Page Network Ring Virtual ATM of Test Transmission 3 Figure ...