363-206-295
Technical Specifications
10-16
Issue 1
December 1997
¶
Optical path penalty includes effects of dispersion, reflection and jitter that occur on the
optical path. The 23G/23G-U has 5.0 dB of total margin. Optical path penalty is normally
1.0 dB. This allows for a maximum dispersion of 92 psec/nm in the 1310 nm wavelength
range. To allow for span lengths greater than 40 km, 2.0 dB is allocated for optical path
penalty. This allows a maximum dispersion of 120 ps/nm. 1.0 dB is allocated for the
optical path penalty for the 23H/23H-U for operation in the 1550 nm wavelength range.
This allows a maximum dispersion of 1800 ps/nm.
**
One connector (0.75 dB) on each end is assumed to connect station cable to outside
plant.
††
Unallocated margin, or safety margin, is typically specified from 0 dB to 3 dB.
‡‡
The 23G/23G-U requires an external lightguide buildout as part of the connector
assembly for loopbacks and for loss budgets less than 10 dB. The 23H/23H-U requires
an external lightguide buildout as part of the connector assembly for loopbacks and for
loss budgets less than 19 (23H) or 10 (23H-U) dB.
§§
Budget available for both station and transmission cable and splices.
¶¶
Attenuation and dispersion can be the limiting factors in span length. For OC-12
systems, the maximum distance could be either attenuation limited or dispersion limited.
The limits must be calculated based on both factors and the lesser of the two defines the
actual maximum span length. A rough rule of thumb for attenuation-limited systems
operating in the 1310 nm wavelength range is 0.45 dB/km. This estimate includes typical
cable loss (0.4 dB/km) and splice loss (0.2 dB per splice, 11 total splices) associated
with single-mode fiber in the 1310 nm range. A rough rule of thumb for systems
operating in the 1550 nm wavelength range on modern nondispersion shifted fiber is
0.25 dB/Km.
Allowing 2.0 dB for the optical path penalty implies 120 ps/nm total dispersion in the
1310 nm wavelength range. Typical maximum slope for single-mode fiber in this
wavelength is 0.092 ps/nm squared per km. Typical nondispersion shifted fiber has a
zero dispersion wavelength between 1300 and 1320 nm. Given these assumptions, the
maximum span length for the 23G/23G-U is 51km.
For OC-12 systems operating in the 1550 nm wavelength range, the maximum distance
is dispersion limited. Allowing 1 dB for the optical path penalty implies 1800 ps/nm total
dispersion. Typical modern nondispersion shifted fiber has 18 ps/(nm
•
km) dispersion in
the 1550 nm wavelength range. Given these assumptions, the maximum span length for
the 23H/23H-U is 100 km.
Maximum span length can be calculated more precisely based on particular fiber and
splice characteristics and local engineering rules.
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 ...
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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 ...
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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 ...