Trunking
Sunday, 19. November 2006, 09:23:27
一般技术领域里有三种解释：
1. Port trunking
In computer networking, trunking describes using multiple network cables or ports in parallel to increase the link speed beyond the limits of any one single cable or port. This is called port trunking or link aggregation. Trunks may be used to interconnect switches, such as major, minor, public and private switches, to form networks.
2. Trunked radio system
A trunked radio system is a radio system used to maximize available capacity in a two-way radio system, usually UHF. Groups of users are given a logical talkgroup to share for their communications, rather than a dedicated radio frequency. Trunking is used by many government entities to provide two-way communication for fire departments, police and other municipal services, who all share spectrum allocated to a city, county, or other entity.
3. VLANs
In the context of VLANs, the term "trunk" denotes a network link carrying multiple VLANs which are identified by labels (or "tags") inserted into their packets. Trunking protocols like ISL and IEEE 802.1Q are needed to carry the data through the trunk.
第二种解释是电信领域中常见的，其实就是如果人很多的话资源就不够了，或者说没有必要为所有人都配备资源，因为“正常情况下”不是所有人都需要同时占用资源，所以就把有限的资源管理起来，要通话的一组人根据组别不同统一分配频率资源，既满足了需求，又节省了资源。But the weasel-phrase "under normal conditions"，呵呵，这就只能靠上帝开眼了。
1. Port trunking
In computer networking, trunking describes using multiple network cables or ports in parallel to increase the link speed beyond the limits of any one single cable or port. This is called port trunking or link aggregation. Trunks may be used to interconnect switches, such as major, minor, public and private switches, to form networks.
2. Trunked radio system
A trunked radio system is a radio system used to maximize available capacity in a two-way radio system, usually UHF. Groups of users are given a logical talkgroup to share for their communications, rather than a dedicated radio frequency. Trunking is used by many government entities to provide two-way communication for fire departments, police and other municipal services, who all share spectrum allocated to a city, county, or other entity.
3. VLANs
In the context of VLANs, the term "trunk" denotes a network link carrying multiple VLANs which are identified by labels (or "tags") inserted into their packets. Trunking protocols like ISL and IEEE 802.1Q are needed to carry the data through the trunk.
第二种解释是电信领域中常见的，其实就是如果人很多的话资源就不够了，或者说没有必要为所有人都配备资源，因为“正常情况下”不是所有人都需要同时占用资源，所以就把有限的资源管理起来，要通话的一组人根据组别不同统一分配频率资源，既满足了需求，又节省了资源。But the weasel-phrase "under normal conditions"，呵呵，这就只能靠上帝开眼了。
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