LC-LC is what you probably want going back to 3750 looking at x520 sheet , what's the distance between the 2 and what sfp are you using on cisco side
http://www.stordis.com/uploads/datasheets/Intel_X520_DA2_datasheet.pdf
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Network Device
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Transceiver Model
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Minimum Software Release Required
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DOM Support
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Software Release
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WS-C3750E-24TD
WS-C3750E-24PD
WS-C3750E-48TD
WS-C3750E-48PD
WS-C3750E-48PDF
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X2-10GB-LR
X2-10GB-ER
X2-10GB-LX4
X2-10GB-SR
X2-10GB-CX4
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12.2(46)SE
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12.2(35)SE2
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X2-10GB-LRM
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12.2(46)SE
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12.2(40)SE
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X2-10GB-ZR
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12.2(50)SE
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12.2(50)SE
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DWDM X2
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12.2(52)SE
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12.2(52)SE
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WS-C3750E-24TD
WS-C3750E-24PD
WS-C3750E-48TD
WS-C3750E-48PD
WS-C3750E-48PDF
(With CVR-X2-SFP10G converter
for X2 ports)
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SFP-10G-SR
SFP-10G-LR
SFP-10G-LRM
SFP-10G-SR-S
SFP-10G-LR-S
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12.2(55)SE1
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12.2(55)SE1
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SFP-H10GB-CU1M
SFP-H10GB-CU3M
SFP-H10GB-CU5M
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—
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12.2(55)SE1
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WS-C3750X-24T
WS-C3750X-48T
WS-C3750X-24P
WS-C3750X-48P
WS-C3750X-48PF
(With C3KX-NM-10G and
C3KX-SM-10G uplink modules)
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SFP-H10GB-CU1M
SFP-H10GB-CU3M
SFP-H10GB-CU5M
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—
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12.2(53)SE
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SFP-10G-SR
SFP-10G-LRM
SFP-10G-LR
SFP-10G-SR-S
SFP-10G-LR-S
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12.2(53)SE
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12.2(53)SE
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SFP-10G-ER
SFP-10G-ER-S
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15.0(2)SE
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15.0(2)SE
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SFP-10G-ZR
SFP-10G-ZR-S
DWDM SFP+
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15.2(1)E
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15.2(1)E
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SFP-H10GB-CU1-5M
SFP-H10GB-CU2M
SFP-H10GB-CU2-5M
SFP-H10GB-ACU7M
SFP-H10GB-ACU10M
SFP-10G-AOC1M
SFP-10G-AOC2M
SFP-10G-AOC3M
SFP-10G-AOC5M
SFP-10G-AOC7M
SFP-10G-AOC10M
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—
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15.2(2)E
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WS-C3750X-12S
WS-C3750X-24S
(With C3KX-NM-10G and
C3KX-SM-10G uplink modules)
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SFP-H10GB-CU1M
SFP-H10GB-CU3M
SFP-H10GB-CU5M
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—
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12.2(55)SE5
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SFP-10G-SR
SFP-10G-LRM
SFP-10G-LR
SFP-10G-SR-S
SFP-10G-LR-S
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12.2(55)SE5
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12.2(55)SE5
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SFP-10G-ER
SFP-10G-ER-S
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15.0(2)SE
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15.0(2)SE
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SFP-10G-ZR
SFP-10G-ZR-S
DWDM SFP+
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15.2(1)E
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15.2(1)E
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SFP-H10GB-CU1-5M
SFP-H10GB-CU2M
SFP-H10GB-CU2-5M
SFP-H10GB-ACU7M
SFP-H10GB-ACU10M
SFP-10G-AOC1M
SFP-10G-AOC2M
SFP-10G-AOC3M
SFP-10G-AOC5M
SFP-10G-AOC7M
SFP-10G-AOC10M
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—
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15.2(2)E
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