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COMSPHERE 3821Plus Modem
3-38 February 1998 3821-A2-GB20-30
Table 3-8
(2 of 2)
Leased Line Configuration Options
Autorate: Enable
Nxt Enable Disable
Autorate. The modems adapt to VF line condition and connect at the optimum rate during initial line establishment. Once
connected, the modem automatically lowers the line rate if line conditions become impaired. When line conditions
improve, the modem automatically shifts up to the highest data rate the line can support. This autorating only occurs
between 4800 bps and 19,200 bps during V.32bis and V.32
terbo
connections and between 2400 bps and 33,600 bps
during V.34 connections.
The factory default is Enable.
AT command equivalent is S-register S82=
n
.
Leased TX Level: 0
Nxt0–1–2–3–4–5–6–7–8–9–10–11–12–13 –14 –15
Leased Transmit Level. Selects the modem’s transmit power level over leased lines. The transmit output level can be
selected in 1 dBm decrements from 0 dBm to –15 dBm.
For V.34 operation over two-wire connections, do not set Leased TX Level to a value higher than –9 dBm.
The factory default is 0 dBm.
NOTE: The default and permitted settings of this option are country-dependent. See Appendix H.
AT command equivalent is S-register S45=
n
.
CarrierOn Level: –43dbm
Nxt –43dbm –33dbm –26dbm
Carrier On Level. This configuration option controls the carrier detection threshold for leased lines. When the power level
of the receive carrier signal drops 2 dBm below this level (–26 dBm, –33 dBm, or –43 dBm), LSD turns Off. When the
carrier signal is greater than this level, LSD turns ON.
The factory default is –43dbm.
NOTE: The default and permitted settings of this option are country-dependent. See Appendix H.
AT command equivalent is S-register S48=
n
.
Asymmetric Rate: Enable
End Enable Disable
Asymmetric Rate. Controls rate symmetry when running V.34 modulation. (This configuration option does not appear
unless V.34 modulation is selected.)
Enable – The modem operates in asymmetric rate mode (the transmit and receive rates can be different) when running
V.34 modulation. Asymmetric Rate must be enabled in both modems.
Disable – The modem operates in symmetric rate mode (the transmit and receive rates are identical) when running
V.34 modulation. Either modem can force symmetric mode by disabling Asymmetric Rate.
The factory default is Enable.
AT command equivalent is S-register S14=
n
.