Cabletron Systems CyberSWITCH CSX101, User'S Information Manual

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Planning Your Router’s Configuration
CyberSWITCH 100 Advanced User Information 29
Use Data Preemption On —
The Preemption Rules are as follows:
• Data calls never preempt voice.
• Voice always preempts data if two B channels are used for the same destination. If a single
B channel is in use, Voice will make use of the unused B channel.
“Use Data Preemption On”. . . . Options:
• All Calls = if you place or receive a call, voice will always preempt data.
• Incoming Calls Only = Call preemption does not occur on incoming calls unless a person
picks up the phone, or a piece of analog equipment answers the phone. If you receive a call
and pick up the receiver, voice preempts data. If both B channels are in use, this will be
indicated by a special tone. To preempt data when you hear this tone, depress the # key to
get a dial tone.
• Outgoing Calls Only = If you pick up the receiver to place a call, voice will preempt data.
If both B channels are in use, this will be indicated by a special tone. To preempt data when
you hear this tone, depress the # key to get a dial tone.
• Never = Voice will not preempt data. You will have to wait for an unused B channel.
Note: An incoming call may not always be forwarded from the central office if two B channels are
already in use for data calls. You must subscribe to a service called Additional Call Offering, or
ACO, for the voice call to be forwarded to the CyberSWITCH.
Automatic Preemption — Automatic Preemption will automatically bring down a B channel
based on the preemption rules for the selected type of call. Otherwise, if you have to selected Data
Preemption, but not Automatic Preemption, you will have to manually preempt the B channel
when the phone rings by pressing the flash (#) key. This mode of preemption also follows the
preemption rules.
Preemption Rules are listed below:
• Data calls never preempt voice.
• Voice always preempts data if two B channels are used for the same destination.
• Call preemption does not occur on incoming calls unless a person picks up the receiver or
a piece of analog equipment answers the call.
Note: An incoming call may not always be forwarded from the central office if two B channels are
already in use for data calls. You must subscribe to a service called Additional Call Offering, or
ACO, for the voice call to be forwarded to the CyberSWITCH.