SFP+ DAC showing as 1000base-CX (Aruba S2500, Brocade BR1020)

Finally got my Brocade BR1020 up and running, connected it to my also-recently-acquired Aruba S2500 switch and it's not bringing up the interface. Show interface transceivers correctly reports the DAC vendor and model but for some reason it's showing as 1000BASE-CX.

Code:

(ArubaS2500-24P) #show interface transceivers

GE0/1/0
-------
Vendor Name                                : 3M
Vendor Serial Number                       : Y20E270655
Vendor Part Number                         : 1410-P11-00-2.0
Aruba Certified                            : NO
Cable Type                                 : 1000BASE-CX
Connector Type                             : Copper Pigtail
Wave Length                                : 1024 nm
Cable Length                               : 2m


GE0/1/1
-------
Vendor Name                                : 3M
Vendor Serial Number                       : Y20E270629
Vendor Part Number                         : 1410-P11-00-2.0
Aruba Certified                            : NO
Cable Type                                 : 1000BASE-CX
Connector Type                             : Copper Pigtail
Wave Length                                : 1024 nm
Cable Length                               : 2m

and as far as the server end of things goes, it shows as NO-CARRIER

Code:

# ip link show
4: enp1s0f2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 1000
    link/ether 8c:7c:ff:70:1b:46 brd ff:ff:ff:ff:ff:ff
5: enp1s0f3: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 1000
    link/ether 8c:7c:ff:70:1b:47 brd ff:ff:ff:ff:ff:ff

Is this a symptom of a lack of compatibility with the Brocade card or the switch (or both!)?