Paradyne COMSPHERE
3610, Operator'S Manual

Page: 174 / 310

COMSPHERE 3600 Series Data Service Units
6-46 July 1999 3610-A2-GB91-90
Table 6-12
(3 of 5)
TDM/MCMP Port (MUX Funct: TDM or MCMP) Configuration Options*
RxCarrSel: Const
Next Const Cntrl Mark Prev
Receiver Carrier Select.
2
Enables the TDM receiver circuitry to simulate switched-carrier operation (using
the V.13 codes) on an individual channel.
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 (switched-carrier operation, PCC mode). 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.
NOTE: Configuration values Const and Cntrl for Receiver Carrier Select are both valid choices for a port
belonging to a digital-sharing group.
PCC Buffer: Disab
Next Enab Disab Prev
Pseudo-Controlled Carrier Buffer. Intercepts the V.13 codes used by the V.13 protocol so they do not pass to
the receiving DTE. This configuration option is only valid when RxCarrSel is set to Cntrl.
For an asynchronous port configured for switched-carrier operation, set PCC Buffer to Enab.
For a synchronous port configured for switched-carrier operation, PCC Buffer can be disabled or enabled,
depending on whether the V.13 codes disrupt communication at the receiving DTE. Be aware that enabling
this option can corrupt the end-of-message for some synchronous protocols.
Enab — Enables the PCC Buffer feature.
Disab — Disables the PCC Buffer feature.
Elast Stor: Disab
Next Enab Disab Prev
Elastic Store. Elastic Store hardware consists of a transmit buffer (register). Serial data from the extended
circuit is clocked into the DSU elastic store using a clock (on EIA-232 Pin 24 or V.35 Pins U and W) provided
by the extended circuit received clock lead (on Pin 17). The DSU uses its own system timing to clock data
out of the buffer.
Elastic Store is reset on power-up, overflow, or after the request-to-send lead makes an Off-to-ON transition.
After reset, the elastic store can drift by
±
5 bits in TDM mode and
±
3 bits in MCMP mode before overflow
occurs.
Enab — Enable this configuration option if you have an extended network.
Disab — Disable this configuration option if you do not have an extended network.
2
For MCMP mode, this configuration option is ignored.
* The menu paths for Port 1 through Port 6 are identical.