CSU/DSU

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Cards (8)

  • CSU/DSU: channel service units/digital service units
  • CSUs/DSUs are devices that convert serialized data such as TI and ISDN to a serial protocol compatible with routers.
    • The CSU/DSU sites between the router and the lease line circuit.
    • In the past the CSU/DSU was a single equipment, but many newer routers have CSUs/DSUs built in.
    • The CSU/DSU will handle the receipt of clocking data from the data communication equipment (DCE) on the provider’s network.
    • The clocking data: helps the CSU/DSU convert the channelized data into digital data so that data terminal equipment (DTE) such as a router can understand the data.
  • The CSU/DSU also helps convert data back into serialized data when the router (DTE) sends information on the provider’s network (DCE).
  • The CSU/DSU uses the RJ-48C universal service order code (USOC) to connect to the provider’s demarcation point.
  • The CSU/DSU is considered part of the customer premises equipment (CPE), so it is the customer’s responsibility.
  • The router side of the CSU/DSU generally has connections for RS-232 or V.25, and in most cases the CSU/DSU is built into the router.