User manual

Campus-RS Fractional Interface Card User Manual 8-1
8
TIMING AND
CLOCK OVERVIEW
This chapter describes different issues in determining the correct settings for
Campus-RS Fractional Interface Card clock and timing source options.
TIMING SOURCE
For normal operation, communications networks normally require that
communicating elements be separated into data circuit-terminating
equipment (DCE) and data terminal equipment (DTE). DCEs normally
provide timing information for the DTEs.
Campus-RS Fractional Interface Cards can operate in two basic network
timing configurations:
• Standard timing configuration: The local and remote Fractional
Interface Cards are both connected to DTE hosts.
• Port timing configuration: One of the Fractional Interface Cards
(either the local or the remote) is connected to a DTE host, and the other
is connected to a DCE host.
The Fractional Interface Cards are currently not capable of operating in a
configuration where both hosts are DCE, and both Fractional Interface Cards
are configured for port timing.