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Clocking.HBus.ClockSource
For information about setting up CT bus clocking, and rules and restrictions for configuring CT bus clocking, refer to
Section 3.5,
Configuring Board Clocking
.
Syntax
Clocking.HBus.ClockSource =
clock_source
Access
Read/Write
Type
String
Default
OSC
Allowed Values
OSC
|
A_CLOCK
|
B_CLOCK
|
NETREF
|
NETREF2
|
NETWORK
Example
Clocking.HBus.ClockSource = OSC
Description
Specifies where the clock reference originates.
Value
Description
OSC
Drives the T1 or E1 line transmit clock using the on-board oscillator.
Do not use for boards that are connected to the PSTN or to any other system that provides reference clocking to the AG board and its telephony bus.
Note: AG board on-board oscillators are not of stratum 4 frequency accuracy and stability. Using
OSC
will likely create clock slips against the PSTN on the AG board's transmit side. Use
NETWORK
to make an AG board act as a slave to the PSTN, and drive the board's transmit clock in sync with the received clock.
For back-to-back operation with two T1 or E1 AG boards on different MVIP buses, set
Clocking.HBus.ClockSource
to
OSC
on one board, and
Clocking.HBus.ClockSource
to
NETWORK
on the other.
A_CLOCK
Causes the board to act as a
clock slave
to the H.100 bus A clocks by deriving the local clock from the bus.
Another H.100 board (or H.110 board) must drive the clock on the bus.
B_CLOCK
Causes the board to act as a
clock slave
to the H.100 bus B clocks by deriving the local clock from the bus.
Another H.100 board (or H.110 board) must drive the clock on the bus.
NETREF
(H.110 NETREF1). H.110 bus network reference. Network reference speed is set by
Clocking.HBus.NetRefSpeed
.
NETREF2
(H.110 NETREF2). H.110 bus network reference. Network reference speed is set by
Clocking.HBus.NetRef2Speed
.
NETWORK
Causes the board to derive the local clock, telephony bus clock, and line transmit clock using the clock extracted from the specified T1 or E1 trunk.
If you select
NETWORK
, you must set
Clocking.HBus.ClockSourceNetwork = 1
,
2
,
3
, or
4
.
The
Clocking.HBus.ClockSource = OSC
option on AG 4000C boards should be used only when the T1 or E1 connection is isolated from the public network. This would apply, for example, when a T1 link is used as a link between two adjacent computers, or one T1 board is used to simulate network traffic to another.
For more information about H.110
A_CLOCK
and
B_CLOCK
, refer to the
ECTF: H.110 Revision 1.0 Hardware Compatibility Specification: CT Bus
.
See Also
Clocking.HBus.ClockMode
,
Clocking.HBus.ClockSourceNetwork
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Copyright © 2001, Natural MicroSystems, Inc. All rights reserved.
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