Section 6: LAN Connection
Aspire S Hardware Manual
Section 6: LAN Connection
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6-3
6
Gatekeeper
Whenever an H.323 terminal activates, a check is made of the network to see if there are any gatekeepers
available. When a gatekeeper is present, it provides users with:
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Address Translation
Users typically do not know the IP addresses of other terminals. When a user makes a call, the gate-
keeper translates an alias address (name or number) to the destination address.
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Admissions Control
Users will not all be able to access the network at the same time because of limited shared resources.
Gatekeepers may restrict network access based on call authorization, bandwidth usage, or some other
criteria. It is important to note that Admissions Control is a way to preserve the integrity of the calls
(provide QoS guarantees) that are already up and operating when a user requests access.
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Bandwidth Control
Besides network access control, the gatekeeper offers network managers the ability to restrict or assign
bandwidth to different applications along certain protocol conventions. This is another place network
managers can enforce QoS guarantees and other enterprise-wide usage policies.
With the Aspire S system, a separate external gatekeeper is not required unless connecting to an outside
H.323 endpoint/gateway which requires an outer gatekeeper or if over 50 outer addresses must be registered.
Otherwise, the Aspire S provides tables within the system programming for address resolution.
IP Hardware
PCBs:
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CPU
- Signals the gateway with VoIP communication
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4VOIPU-S
- The 4VOIPU-S PCB provides a 4-channel voice packet gateway unit and works as a
media gateway for VoIP communication. This PCB is required for either VoIP trunks or when using
VoIP keysets which talk to non-IP keysets. VoIP keyset-to-VoIP keyset can talk without a media gate-
way and without using any DSP resources using the Peer-to-Peer feature. Refer to the VoIP feature in
the Aspire Software Manual for more detail on the Peer-to-Peer feature.
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4VOIPDB-S
- The 4VOIPDB-S daughter board provides an additional 4 channels when attached to the
4VOIPU-S PCB
Refer to PCB Port Assignments on page 2-35 for details on the port usage with the VOIPU PCB
and VOIPDB. As these cards are assigned trunk ports when initially installed, this could impact the
number of ports available for extensions.
Terminals:
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IPhone
- Aspire 34-button multi-line IP phone
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IP Adapter
- IP adapter connects an Aspire keyset to the VoIP network
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ITR-2D-1
- H.323 IP phone
Power must be supplied to the IPhone, the Aspire keyset with an IP adapter, or ITR-2D1 phone using either
a local or central power supply. If there is a power outage, the VoIP phones will not work unless the phones
are plugged into a UPS (Uninterruptable power supply).
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Local Power Supply
The AC-2R Unit is an AC adapter for Aspire IPhone or the IP adapter. The ITR-2D1 has an AC adapter
included that should be used for power.
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Central Power Supply:
•
24-port power supply PoE-managed switch (NEC BlueFire 200/24)
Power feeding through signal pair (1/2, 3/6) or spare pair (4/5, 7/8)
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Cisco Data Switch - CDP Supported
Note that the Aspire IP phones are not IEEE 802.3af compliant.
