Multi-Tech Systems MMV1600 owner manual Configuration

2.2 Configuration 1

Configuration 1 is a data-only configuration. This configuration has two Multi-Tech MultiMux MMV1616C/56 which are sixteen channel multiplexers with internal 56K bps composite link DSUs linking sites one and two over a Digital Data Service (DDS) network provided by your telco facility. The local site has the MMV1616C/56 connected to a host minicomputer. The remote site has fourteen terminals and two shared printers connected to the asynchronous channels of the remote mux. At the remote site, the terminals are communicating with the remote mux on 19.2K bps asynchronous channels, and the printers are configured for one setting above its cps rating. Configuration 1 is shown in Figure 2-1.

Asynchronous		Composite Link	Asynchronous
Channel			Channel
		PDN
		Digital Line	MultiMux 16
	MultiMux 16

MultiMux MMV1616

MultiMux MMV1616

Minicomputer

Local Site

(Node 1)

Printer

Terminal Terminal

Printer

TerminalPrinter

Remote Site

(Node 2)

Figure 2-1. Configuration 1

The local async channels can be configured to communicate with any of the async channels at the remote site. The asynchronous channels of the local mux are configured with XON/XOFF software flow control enabled, so that the channel buffers in the local mux do not lose data from the host. With flow control enabled at the local mux, the local mux can tell the host when it feels that it's dynamic buffers are becoming full. For the same reasoning, pacing should be enabled at the remote site printer channels to ensure that all data is received by the printers. Pacing allows the printer to tell the remote mux not to send any more data until its buffers are cleared. Pacing may also be enabled at the remote site terminal channels if it appears that data is being lost at the terminals. The first set of parameters in the following examples are for the local mux and the second set are for the remote mux.

Local Channel Parameters/ Node # 01

			STP		FLOW	ENQ/			PASS	PASS DEST DEST			LINK
CHN SPD WD BIT PAR					CTRL	ACK	ECHO	PACE	EIA	XON	CHN NODE		A/B
01	19200	8	1	NONE	XON/XOFF	OFF	OFF	OFF	OFF	OFF	01	02	A
02	19200	8	1	NONE	XON/XOFF	OFF	OFF	OFF	OFF	OFF	02	02	A
03	19200	8	1	NONE	XON/XOFF	OFF	OFF	OFF	OFF	OFF	03	02	A
04	19200	8	1	NONE	XON/XOFF	OFF	OFF	OFF	OFF	OFF	04	02	A
05	19200	8	1	NONE	XON/XOFF	OFF	OFF	OFF	OFF	OFF	05	02	A
06	19200	8	1	NONE	XON/XOFF	OFF	OFF	OFF	OFF	OFF	06	02	A
07	19200	8	1	NONE	XON/XOFF	OFF	OFF	OFF	OFF	OFF	07	02	A
08	19200	8	1	NONE	XON/XOFF	OFF	OFF	OFF	OFF	OFF	08	02	A
09	19200	8	1	NONE	XON/XOFF	OFF	OFF	OFF	OFF	OFF	09	02	A
10	19200	8	1	NONE	XON/XOFF	OFF	OFF	OFF	OFF	OFF	10	02	A
11	19200	8	1	NONE	XON/XOFF	OFF	OFF	OFF	OFF	OFF	11	02	A
12	19200	8	1	NONE	XON/XOFF	OFF	OFF	OFF	OFF	OFF	12	02	A
13	19200	8	1	NONE	XON/XOFF	OFF	OFF	OFF	OFF	OFF	13	02	A
14	19200	8	1	NONE	XON/XOFF	OFF	OFF	OFF	OFF	OFF	14	02	A
15	19200	8	1	NONE	XON/XOFF	OFF	OFF	OFF	OFF	OFF	15	02	A
16	19200	8	1	NONE	XON/XOFF	OFF	OFF	OFF	OFF	OFF	16	02	A

OK