Black Box 5000 manual Link Configuration, Types of Links, Avoid Node Duplication

Multiserver 5000

8. Link Configuration

8.1 Types of Links

There are three types of links in the Multiserver system:

An Interconnect Link connects two Multiservers (usually over an analog or digital circuit provided by the telephone company).

A Mux Link connects a Multiserver to a compatible multiplexer. The Feeder Mux can be connected directly to the Multiserver or remotely using a line driver, modem, or ISU.

An X.21 Link connects a Multiserver to a compatible multiplexer via an X.21 bis network.

8.2 Avoid Node Duplication

Your local node should already be named (see Section 6.6, Name the Local Node). To avoid duplication of a node number or ID in a string, V, or star network, connect one link at a time. After each link is connected, access the remote node to configure its node number and ID. Then connect the next link.

FEEDER MUX

A3

FEEDER MUX

A4

A5
SYNC
TERMINAL
ASYNC
TERMINAL	A6

NOTE: Depending on how your network will be configured, it may not be possible to do all network configurations from one node. You might have to name and configure each node independently before installing the links.

If a link is established between two Multiservers that have the same node number or ID, a DUPLICATE NODE-IDerror message will be displayed.

8.3 Assign a Port for Each Link

Each link must be attached to a port on the CCM. Interconnect links should be configured on the lower-most channels (i.e., A1, then A2), followed by mux and X.21 links, then sync channels, and finally async channels. Configuring the node in this manner will yield optimum performance. See the example in Figure 8-1.

NOTE: When the CSU/DSU module is installed and operational, it is considered attached to port A1. All configurations for port A1 directly affect the CSU/DSU module. The A1 LED indicator will go off when the interconnect link attached to the CSU/DSU module is functioning properly.

LOCAL HUB

A1

A2

MULTISERVER

5000

Figure 8-1. This is an example of a local hub in a dual-link, point-to-point network that has been configured for optimal performance. The lower-numbered channels, A1 and A2, are configured for interconnect links. Next in priority are mux and X.21 links, followed by sync and async data channels.

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