Hardware manual

Crest Audio Inc. NexSys v. 3.0

Software Manual Page 3.3

A network may be made up of one or more busses. The bus connected to the Bus Server is

deﬁned as the primary bus. All other busses in the network are referred to as secondary

busses and must be attached to the primary bus through a hub or data concentrator.

All nodes on the primary bus will have single-tiered addresses as follows:

Device Address

CKS 200 1

CKS 400 2

CKS 800 3

Hub (1st) 10

Hub (2nd) 20

Hubs

A network cannot support more than 32 nodes. Hubs must be used for networks larger than

32 nodes or where odd physical network runs are required. A hub has two bus connections,

one for the primary side and one for the secondary side. The bus on the secondary side of

the Hub (its secondary network) is electrically isolated from the primary bus but is still a

part of NexSys’ overall network.

Hubs expand the maximum number of nodes in a system from 32 to 1024. The number of

unique addresses is also expanded.

Nodes on a hub’s secondary side will have a “two part” address. The ﬁrst address is the

hub’s primary address (i.e. the address of the hub on the primary bus.) The second address

is the address of the node on the secondary bus. In the ﬁgure, the ﬁrst hub (at primary

address 10) has two CKV ampliﬁers attached to its secondary bus. Their addresses are:

Device Address

CKV 200 10,4

CKV 400 10,5

Similarly, the second hub (at primary address 20) has two CKS ampliﬁers attached to it:

Device Address

CKS 1600 20,1

CKS 1200 20,2

Notice that ampliﬁers “CKS 1600” and “CKS 1200” on the second hub’s bus have the same

addresses (1 and 2) as the CKS 200 and CKS 400 on the primary bus. This is acceptable

because the inclusion of a unique primary address differentiates them in the network .

Supervisors (Pro class only)

A Pro class network must have at least one Supervisor. Although the two classes of ampli-

ﬁers may be combined on a single network, it is helpful to separate them for illustration pur-

poses. Each ampliﬁer has a two part address. The ﬁrst being the node address of its

Supervisor main frame and the second being the ampliﬁer number or Supervisor port num-

ber. There are two Supervisor ports per Supervisor daughter card. There is a one to one con-

nection between each Supervisor port and ampliﬁer.