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DCP Configuration
5-173910-A2-GN32-40 September 1998
Table 5-1
(8 of 10)
DTE Interface Configuration Options
TX Clock Source: Internal
Nxt Internal External RXC_Loop
This configuration option only appears if Async/Sync Mode is configured for Sync.
Transmit Clock Source. Determines the source of timing for synchronous data transmitted from the modem
to the analog channel.
H Internal
The transmit data’s clock source is derived from the modem’s internal clock. This clock is
available as an output on Pin 15 (TXC) of the EIA-232-D interface.
H External
The transmit data’s clock source is provided by the DTE on Pin 24 (XTXC) on the EIA-232-D
interface.
H Receive Clock Loop
The modem’s transmit clock is derived from its received analog signal. The derived clock is
available as an output on Pin 15 (TXC) of the EIA-232-D interface.
The AT command for Internal is &X0.
The AT command for External is &X1.
The AT command for RXC Loop is &X2.
Bakup_TXClk_Src: Internal
Nxt Internal External RXC_Loop
This configuration option only appears in customized installations in which the Dual_Leased_Ln is
configured for Enable and Async/Sync Mode is Sync.
Backup Transmit Clock Source. Selects the clock reference source when operating in the Dual Leased
Line Mode. This is a special mode in which one leased line is used to back up another.
H Internal
The transmit data’s clock source is derived from the modem’s internal clock. This clock is
available as an output on Pin 15 (TXC) of the EIA-232-D interface.
H External
The transmit data’s clock source is provided by the DTE on Pin 24 (XTXC) on the EIA-232-D
interface.
H Receive Clock Loop
The modem’s transmit clock is derived from its received analog signal. The derived clock is
available as an output on Pin 15 (TXC) of the EIA-232-D interface.
XTXC Clamps TXC: Enable
Nxt Enable Disable
This configuration option only appears if TX Clock Source is configured for External.
External Transmit Clock Clamps Transmit Clock. Allows the modem’s TXC output (Pin 15 on the
EIA-232-D interface) to be clamped OFF when TX Clock Source is configured for External.
H Enable
TXC is clamped off when TX Clock Source is configured for External.
H Disable
TXC continues to be provided when TX Clock Source is configured for External.
The AT command is S-Register S71=n, where n is 0 for Enable and 1 for Disable.