[c-nsp] Cisco 3550 with WS-G5483 Link Always Up?

[Devon True]

All:

When I place a WS-G5483 1000BaseT gbic into a Cisco 3550 running
12.1(22)EA4, the link is up/up even though there is no Ethernet cable
installed. Is this normal behavior? Is there some knob that I am missing?

#sho int g0/1
GigabitEthernet0/1 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet, address is 000e.84ee.bd19 (bia
000e.84ee.bd19)
  Description: Lab
  MTU 1504 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 1000Mb/s, media type is T
  input flow-control is off, output flow-control is off
  ARP type: ARPA, ARP Timeout 04:00:00
  1000BaseT module (WS-G5483) in GBIC slot.

--
Devon