Appendix E: Glossary
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Hook Flash
The process of the receiver going temporarily off-hook, usually in an attempt to transfer the phone call.
Hot-Swappable
Refers to the ability to add or remove particular cards to or from the system without removing power.
HTTP
Hypertext Transfer Protocol. A higher level protocol within the TCP/IP suite of protocols which is responsible for implementing web browsers. This is
the protocol implemented by the SG-CPM5 to enable the web interface to function.
IEEE 802.3
See Ethernet.
Internal Trouble
A trouble condition which is generated inside a receiver, as opposed to being sent as an alarm from the panel. Internal troubles are also sent to the printer
and automation outputs.
Kiss-off
A term used in the security industry for a positive acknowledgement.
Line
An individual channel on a line card. Equivalent to one telephone line.
Line Card
A removable, hot-swappable card which contains a POTS line interface which controls 1 or more POTS lines.
MAC Address
Media Access Control. A globally unique device 6-byte address which identifies a device attached to an Ethernet network. Assignment of MAC addresses
is governed by the IEEE; any OEM company which manufactures Ethernet devices must apply for and purchase an OUI (Organizationally Unique Iden-
tifier), which consists of a block of 16,777,216 MAC addresses, all of which have the same first 3 bytes. Subsequent allocation of addresses within that
block is at the discretion of the purchaser. Each Ethernet device produced must be programmed with a different MAC address in order to guarantee that
each device will function correctly on the network. manufacturing.
Multidrop
A communication link in which a single channel is shared by several stations or nodes (DVACS is a Multidrop network). Only one station may transmit at
a time. Multidrop is also referred to as multipoint.
Negative Acknowledgement (NAK)
See acknowledgement.
Off-Hook
The process of connecting to the telephone line to answer an incoming call or dial a remote device (answering).
On-Hook
The process of releasing the telephone line after completion of a call (hanging up).
Options
A set of user-configurable parameters which controls the operation of a device. In the SG-System 5, both the SG-DRL5 and the SG-CPM5 contain sets
of options. Static options are affect all Profiles on a card. Dynamic options are unique to each profile.
Packet
A group of digits or characters of information in an alarm.
Panel
A device (the alarm system) at the protected premises used to transmit alarms to the receiver.
Ping
A standard network command which can be used to verify the presence of a device on a network, using the device IP address. Ping is implemented as part
of the ICMP protocol and consists of the Echo Request and Echo Reply commands (poll and response respectively).
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