ZyXEL Communications X6004 User Manual page 128

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Table of Contents

Chapter 6 Server

The BRI interface card enables the X6004 to communicate with the following BRI

• 5ESS - AT&T basic rate switches

• NI1 - National ISDN-1 switches

• ENT3 - Euro-ISDN switches (UK and others)

• AUS - Australian TS013 switches

Q.SIG is a protocol used for ISDN PRI voice signaling. Q.SIG enables the X6004 to

connect PBXs and central office switches (COs) using the Q.SIG protocol. The

X6004 can be a Q.SIG master or Q.SIG slave.

• Master - is responsible for layer 2 signaling and initiates the negotiation.

• Slave - responses master's signaling.

You must connect a Q.SIG master device to a Q.SIG slave device. An example of a

Q.SIG configuration is shown next.

Figure 52 Q.SIG Configuration Example

Side A/B Settings in Q.SIG

When using Q.SIG, the side A and B settings are used to avoid voice channel

collision. See an example in the following figure. In E1, there are 30 voice

channels. X6004 (X) requests to use channel 1 for an outgoing call and waits for

Y's response. Almost at the same time, X receives Y's request to also use channel

1 for an outgoing call. If you configure X to use the side A, X will ignore Y's

X6004 User's Guide