Hitachi GR2000 Series Installation Manual page 373

or 1000BASE-LH cable connector (SC 2-core) to the mating receptacle on the own
router.
Figure 6-62 Connection of 100BASE-FX, 1000BASE-SX, 1000BASE-LX, or 1000BASE
6.4.3.3 WAN: V.24, V.35, and X.21
SC 2-core
Cable Connector (SC 2-core)
When connecting, push until a click.
When removing, just pull.