MX-2100/2104
Installation and Operation Manual
Chapter 1 General Information
Application Considerations
1-47
Timing of Channels with "S" Interface
The transmit timing of a channel with "S" interface, such as a KVF.4/S0 module,
depends on the selected operating mode:
•
NT Mode.
MX-2100 provides the transmit clock for the "S" interface. The
receive timing is recovered from the signal received from the user's terminal
equipment.
•
TE Mode.
One of the "S" interface ports connected to the network termination
(NT) unit must be selected as an external clock source for MX-2100. Thus the
MX-2100 nodal clock, and therefore the transmit timing of the "S" interface, are
locked to the timing of the NT unit.
Sub Link Timing
The KVF.5 modules include a standard T1 or E1 sub link interface. The following
timing options are available:
•
T1/E1 Line Signal.
The receive clock of the sub link is always derived from the
incoming T1 or E1 line signal, and the transmit clock is derived from the nodal
timing source of MX-2100.
•
Recovered Receive Clock.
The recovered receive clock of the sub link can be
selected as the reference for the MX-2100 nodal timing. If this option is not
used, the equipment connected to the sub link must operate with loopback
timing, or its timing must be locked to the same source that serves as the
reference for the MX-2100 nodal timing.
Main Link Interface Characteristics
V.35 Interface (Module KML.1)
The V.35 interface supports all the interface signals specified by ITU-T Rec. V.35.
Note the following:
•
The DTR signal is constantly ON as long as MX-2100 is powered.
•
The RTS signal is normally ON, except when a local main link loop is
connected.
•
The DSR and CTS signals are handled in accordance with user's selection:
−
When the DSR&CTS parameter is set to external, and the DSR and/or CTS
signals are OFF, the transmit data line is continuously held at MARK.
−
When the DSR&CTS parameter is set to internal, the DSR and CTS signals
are ignored (internally interpreted as being continuously ON).
RS-232 Interface (Module KML.2)
The RS-232 interface supports all the interface signals specified by EIA RS-232.
Refer to the notes regarding the DTR, RTS, DSR and CTS signals presented for the
V.35 interface.
