Clock Source, Or Timing, For The E1- Or T1-Carrier Line - HP ProCurve Secure 7000dl Series Basic Management And Configuration Manual

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Clock Source, or Timing, for the E1- or T1-Carrier Line

Because data transmission requires hosts to be synchronized, you must
configure the clock source, or timing, for the E1 or T1 interface. You can
configure the E1 or T1 interface with one of the following clock sources:
Line—Use the line setting if the E1 or T1 interface will take the clock
source from the public carrier.
Internal—Use the internal setting if the E1 or T1 interface will provide
the clock for the connection. For example, if you connect the ProCurve
Secure Router to another router, one of the routers must provide the clock
source. If the local ProCurve Secure Router is providing the clock source,
use the internal setting.
Through—Use the through setting if you want the E1 or T1 interface to
take the clock from the other interface on that module.
Each narrow E1 or T1 module can have only one clock source. If the module
has two ports, one port must be set to line or internal; the other port must
be set to through.
Each port on the eight-port E1 or T1 module can have its own clock source.
You can set the clock source for each port to line.
Table 4-3 shows the default clock source settings for the different ports on the
E1 or T1 modules.
Table 4-3. Default Clock Source Settings for E1 and T1 Modules
Module
One-port E1 or T1 module
Two-port E1 or T1 module
E1 + G.703 module
T1 + DSX-1 module
Eight-port module
On the one-port E1 and T1 modules, the only clock source options are
internal and line. This is because when an E1 or T1 line accepts a clock
source through setting, the timing must come from another port on the same
module.
Configuring E1 and T1 Interfaces
ProCurve Secure Router Modules
Port Default Clock Source
1 line
1 line
2 through
1 line
2 through
1–8 line
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