In 1992 Sprintlink had AGS+ routers in it's network, so did everyone
else. The AGS+'es where replaced by 7000's with 64M and SSE's and then
'downgraded' to 75xx routers with 128M.
The current Sprintlink core is a mix of 75xx routers with 128M and
VIP2/80-POS oc3c interfaces and cisco 12000 routers with 256M and
oc3c and oc12c.