363-206-295
Technical Specifications
Issue 1
December 1997
10-17
OC-3 Optical Interface Mixing
1
0
Mixing different OC-3 rate OLIUs at opposite ends of an optical link is often
necessary for technical reasons or for convenience. The following information will
aid in planning and engineering optical links having different types of OC-3 rate
OLIUs at each end of the fiber. Table 10-9 details the minimum link budget
necessary for each pairing of OC-3 rate OLIUs.
To use Table 10-9, locate the number at the intersection of the transmitter/receiver
pair of interest. This number is the minimum attenuation necessary for proper
operation of that transmitter/receiver pair. The link must have at least this much
attenuation either from fiber loss, splice loss, connector loss, external attenuators,
or a combination of these, or the receiver will be overdriven and the link will not
operate properly.
Note that the minimum link budget is not always symmetrical. A transmitter/
receiver pair may have one minimum link budget in one direction and another in
the opposite direction. For example, a 21G/21G-U (low power) OLIU transmitting
to a 21D/21D-U (controlled environment) OLIU has a minimum link budget of 6.5
dB. In the opposite direction, though, a 21D/21D-U (controlled environment) OLIU
transmitting to a 21G/21G-U (low power) OLIU has a minimum link budget of 0.0
dB. Be careful of this asymmetry when planning and engineering a link having
mixed OLIUs.
Table 10-9. OC-3 Rate OLIU Mixes - Minimum Link Budgets (dB)
Transmitter
Receiver
21G/21G-U
21G2-U
22F/
22F-U 22G-U
∗
22G2-U
21D/21D-U/
22D-U
22F2-U
21G/21G-U
(high power)
4.5
0.0
4.5
4.5
0.0
11.5
0.0
21G/21G-U
(low power)
0.0
0.0
0.0
0.0
0.0
6.5
0.0
21G2-U
7.0
0.0
7.0
7.0
0.0
14.0
0.0
22F/22F-U/
22F2-U
22G-U
∗
22G2-U
0.0
7.0
7.0
0.0
0.0
0.0
0.0
7.0
7.0
0.0
7.0
7.0
0.0
0.0
0.0
6.0
14.0
14.0
0.0
0.0
0.0
21D/21D-U/
22D-U
0.0
0.0
0.0
0.0
0.0
0.0
0.0
*
The LAA10 FT-2000 OC-3 Optical Interface has the same optical loss budget as the 22G-U and
therefore should follow the same optical mixing 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 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 ...