Paradyne COMSPHERE 3611 - Manual (Page 39)

COMSPHERE 3600 Series Data Service Units
4-12 September 1996 3610-A2-GB48-50
Table 4-4
(2 of 5)
TDM/MCMP Port Configuration Options *
RTS Cntrl: DTE
Next FrcOn DTE Prev
Request-to-Send Control. Controls the internal RTS lead operation.
NOTE: Refer to next configuration option, Transmitter Carrier Select, for a description of constant-carrier and
switched-carrier operation.
FrcOn – DSU keeps the internal RTS ON continuously. Any data appearing on the transmitted data (TXD) lead from the
DTE is transmitted immediately. Choose this configuration value for constant-carrier operation.
DTE – DSU turns RTS ON when the external RTS is turned ON. CTS is turned ON or Off by the external control signal
RTS. Choose this configuration value for switched-carrier operation.
TxCarrSel: Const
Next Const Cntrl Prev
Transmitter Carrier Select. Enables the TDM transmitter circuitry to simulate switched-carrier operation using the
V.13 codes on an individual channel. The simulated switched-carrier operation is also referred to as pseudo-controlled
carrier (PCC) mode. Required for applications where the receiving DTE expects a raised LSD lead prior to receiving
data. Not valid for MCMP.
NOTE: A port may be configured for switched-carrier operation in one direction and constant-carrier operation in the
other direction.
For MCMP mode, this configuration option is ignored except during dial backup when the MCMP Backup
configuration option is set to TDM (Table 4-1) or a V.32 DBM is installed.
Const – Transmit Constant Carrier (constant-carrier operation). The V.13 codes are not sent. The corresponding remote
TDM or MCMP port must be configured for Receiver Constant Carrier or Mark (RxCarrSel set to Const or Mark).
Configure each port in a digital-sharing group for Constant Carrier operation (TxCarrSel set to Const).
Cntrl – Transmit Controlled Carrier (switched-carrier operation, PCC mode). The DSU transmits the V.13 codes over the
DDS line when the port RTS changes state. When RTS is turned ON, the DSU transmits a code that turns ON LSD at
the remote TDM or MCMP port before CTS is turned ON at the local TDM or MCMP port. When RTS is dropped, the
DSU sends a code that turns Off LSD at the remote TDM or MCMP port. The corresponding remote TDM or MCMP port
must be configured for Receiver Controlled Carrier (RxCarrSel set to Cntrl). This selection is not valid if the DSU is part
of a Digital-Sharing Device (DSD) group. See Mark selection in the RxCarrSel configuration option.
RxCarrSel: Const
Next Const Cntrl Mark Prev
Receiver Carrier Select. Enables the TDM receiver circuitry to simulate switched-carrier operation using the V.13 codes
on an individual channel. Not valid for MCMP.
NOTE: Configuration values Const and Cntrl for Receiver Carrier Select are both valid choices for a port belonging to a
digital-sharing group.
Const – Receiver Constant Carrier (constant-carrier operation). The receiving DSU does not look for V.13 codes used
by the V.13 protocol and does not toggle LSD.
Cntrl – Receiver Controlled Carrier for switched-carrier operation in PCC mode (see PCC Buffer, next configuration
option). The receiving DSU looks for V.13 codes used by the V.13 protocol that indicate the transition of RTS at the
remote TDM port; the receiving DSU toggles LSD as appropriate.
Mark – If 30 consecutive marks are received, received Line Signal Detect (LSD) goes Off at the port. Received LSD
goes ON again just before the first space. TxCarrSel must be set to Const at the remote unit. This configuration option is
used primarily when the remote DSU has a DSD group.
* The menu paths for Port 1 through Port 6 are identical; each port is set separately. Ports 3 through 6 do not appear
when a 2-port TDM/Flex or a 2-port MCMP/Flex is installed.