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1.5
System Features
1.5.1
Voice/Fax
With the addition of the voice/fax board into the MultiMux, you now can have voice and fax traffic along with your
normal data communications on the same composite link. The two voice/fax channels provide all the necessary
interfaces to access a private branch exchange (PBX, a small telephone switch) and all the services provided by the
PBX. If a voice/fax channel is connected to the trunk side of the PBX, the remote location has free access to the local
public switched telephone network (PSTN). With the addition of voice/fax, a free voice or fax communication can be
established on top of the data communication over the same leased data communications network.
1.5.2
Networking
The networking feature adds the capability to design complex networks, it also meets a very basic need: saving phone
line costs. Networking MultiMuxes allows the stringing of several MultiMux units together via dual composite links,
using "pass-through" channel connections, to any MultiMux in a multinode network. The MultiMux checks for a code
that will instruct it to receive the data or pass it on to the next node. Each composite link on a mux can establish
rerouted connections with up to four other muxes in a network. Voice/fax channels must currently be connected point-
to-point. However, voice/fax channel networking will be available as a future enhancement.
1.5.3
Dual Composite Links
The composite links of the MultiMux are capable of synchronous and full duplex communications over a digital data
services (DDS) or dedicated network. The MultiMux has two composite links in which either integral 56K bps DSUs or
equivalent external DSUs or synchronous modems can be connected. With dual composite links, another feature is
added to the MultiMux in the way of networking. Networking MultiMuxes allows the stringing of several MultiMux units
together via their composite links. This feature allows data to be routed over the composite links using pass-through
channel connection to any MultiMux in the multinode network. The MultiMux checks for a code that will instruct it to
receive the data or pass it on to the next node. Each composite link on a mux can establish rerouted connections with
up to four other muxes in a network.
1.5.4
Dynamic Load Balance
A feature of MultiMux MMV1600/MMV3200 series multilink multiplexers is their ability to balance data flow between two
composite links to utilize each to its maximum efficiency. To activate the feature you select D (for dynamic) as the
composite link for each channel using the MLD command. At that point the MultiMux processor picks the least busy
link for transmission. This feature can only be used in a point-to-point network using two MultiMuxes.
1.5.5
Channel Flexibility
The MultiMux permits a great deal of flexibility in configuring channel parameters. You can mix up channel options,
including speed, word length, stop bits, parity, flow control, pacing methods, echo and pass-through. Channel control
commands let you change single channels or all channels with a single command. By using the downline loading
capability or the command modem, channels can be configured at the other end of the network.
1.5.6
Flow Control
Flow control regulates the volume of data entering the buffers. When a particular channel buffer is almost full, a flow
control command is issued which stops further activity until the buffer is emptied. The most common flow control
methods currently used are Xon/Xoff, RS232C signal control (using DTR or CTS) and ENQ/ACK. The MultiMux
supports all three.