C H A P T E R 3 C O N F I G U R I N G V 1 0 0
V100 Versatile Multiplexer Technical Manual Version 2.2
Page 47 of 231
ALARMS
The V100 contains a summary alarm relay, which presents voltage-free changeover contacts on three
pins of the supervisory port. These may be wired into an external network monitoring system to record
loss of power or loss of carrier on any aggregate port. The alarm mode may be selected, together with an
activation delay.
COUNTRY
Four country selections are available to allow the user to tailor the ring cadence and comfort tones of the
voice channels to suit national standards.
CONNECTION TIMEOUT
Data paths in a V100 network are managed in terms of connections. When a telephone is lifted and a
destination channel number dialled, a connection request is processed by the routing software and either
accepted or rejected according to the existing link traffic. The CONNECTION TIMEOUT parameter allows
the network manager to optimise the timeout before the V100 rejects the request. This can be adjusted to
allow slow-response networks (e.g. DAMA) time to connect.
RECEIVE READY FILTER
In satellite systems there is often a “Carrier Detect” or “Receiver Ready” signal returned by the network
when the connection is made. In SWITCHED carrier modes (see Data Configuration), this is used by the
V100 as an indication to proceed. The signal produced by satellite modems can be unstable during the
initial stages of carrier acquisition and so a programmable filter is provided to guarantee the “Receiver
Ready” signal is steady before the V100 sends connection messages across the link.
DATA CHANNEL ACTIVATION
Connections for data channels in the V100 network are always point-to-point. In other words, however
complex the route taken from say, terminal to computer, a permanent connection is still set up between
the two devices. Here, the “DATA CHANNEL ACTIVATION” option is left in its default state of “Auto”. In
some cases, it may be desirable for the connected terminal equipment to switch the bandwidth on only
when required; in this case the “DATA CHANNEL ACTIVATION” option may be set to “Flag”, such that the
connection is set up when the terminal affirms the RTS signal (or equivalent in V.11, RS449 or V.35
modes) into the port. This allows more flexible interworking with voice and DBA data channels.
DATA CHANNEL FLAG
In a similar way, the “DATA CHANNEL FLAG” setting allows the user to select how the “CTS” (or
equivalent) signal from the V100 reacts. It may be set permanently on, to activate only when the
connection is made or to reflect the state of the “RTS” signal at the remote port.
