[c-nsp] Subrate T3 card

[Joseph Mays]

I have a T3/E3 card in a cisco 3640 that I want to use as a serialT3, but it 
does not show up as a serial interface, nor is there even a controller line 
in the config. It only shows up in the hardware infomration as a "Subrate 
T3/E3 port". What does this mean?

gw1.dist uptime is 1 hour, 36 minutes
System returned to ROM by power-on
System restarted at 17:00:56 EDT Tue Jul 26 2011
System image file is "flash:c3640-is-mz.123-6.bin"

cisco 3640 (R4700) processor (revision 0x00) with 124928K/6144K bytes of 
memory.
Processor board ID 11876053
R4700 CPU at 100MHz, Implementation 33, Rev 1.0
Bridging software.
X.25 software, Version 3.0.0.
SuperLAT software (copyright 1990 by Meridian Technology Corp).
2 FastEthernet/IEEE 802.3 interface(s)
2 Serial network interface(s)
1 Subrate T3/E3 ports(s)
DRAM configuration is 64 bits wide with parity disabled.
125K bytes of non-volatile configuration memory.
24576K bytes of processor board System flash (Read/Write)

Configuration register is 0x2102

gw1.dist#