Black-box 5000 User Manual download pdf (Page 72)

Multiserver 5000

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.

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-ID error 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.

8. Link Configuration

MULTISERVER

5000

ASYNC

TERMINAL

FEEDER MUX

SYNC

TERMINAL

LOCAL HUB

FEEDER MUX

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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Black-box 5000 User Manual Page 72

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