cisco switches uplink issue

hi

i have problem connecting two cisco catalyst switch UPLINK

1- Cisco catalyst 2960 >> interface gigaethernet 0/1
2- Cisco 3750 fiber only >> interface gigaethernet1/0/5
===============================================================
The problem is after some configuration i have made the led from the 2960 is blinking and from the 3750 core switch no blinking at all !!
===================================================================

At the 3750

GigabitEthernet1/0/5 is down, line protocol is down (notconnect)
  Hardware is Gigabit Ethernet, address is 001b.0d59.6985 (bia 001b.0d59.6985)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Auto-duplex, Auto-speed, link type is auto, media type is 1000BaseLX SFP
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts (0 multicast)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     0 packets output, 0 bytes, 0 underruns
     0 output errors, 0 collisions, 13 interface resets


At the 2960

GigabitEthernet0/1 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet, address is 10bd.1838.3531 (bia 10bd.1838.3531)
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Full-duplex, 1000Mb/s, link type is force-up, media type is 1000BaseLX SFP
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output 00:00:01, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/0 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts (0 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     25871 packets output, 1871332 bytes, 0 underruns
====================================================================

if you notice that the status from the 3750 side is notconnect !!

any idea how to fix that issue
LVL 3
F_A_H_DAsked:
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Ernie BeekExpertCommented:
Could very well be. Also (from memory) SMF and MMF have different core diameters. So I would first try to get the correct cable. I think that should solve the isse.
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Ernie BeekExpertCommented:
Is the cable ok? And didn't you switch the connectors?
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F_A_H_DAuthor Commented:
cable is new

you know what !! i found that the connector is SM and am using MM cable

could be this is the reason ?
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F_A_H_DAuthor Commented:
u correct man

i swapped then found both of them notconnect status
thats mean one of the connectors are not working

am i correct ?
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