MT92210 Zarlink Semiconductor, MT92210 Datasheet - Page 186

• Manufacturer Part Number: MT92210
• Description: 1023 Channel Voice Over ip (VoIP) Processor
• Manufacturer: Zarlink Semiconductor

MT92210
Data Sheet
MAC (M edia A ccess C ontrol ): The MAC layer is concerned with the control of access to a medium shared between
two or more entities. It is a control layer for Ethernet.
OC-3 (O ptical C arrier level- 3): A SONET channel that carries a bandwidth of 155.55 Mbps.
Packet: The “data” unit carried on a link layer. A packet, on an IP network, consists of an entire IP datagram or a
fragment of a datagram.
PCM (P ulse C ode M odulation ): PCM is the basic method of encoding an analog voice signal into digital form using
8-bit samples. Defined by the ITU standard G.711.
PHY (PHY sical layer )
PLL (P hase L ock L oop ): A phase lock loop is a component that generates an output clock by synchronizing itself to
an input clock. PLLs are often used to multiply the frequency of clocks.
POS (P acket O ver SONET): A means of transporting packets over a SONET link with minimal overhead in a
point-to-point connection. POS uses PPP as its link protocol.
POS-PHY : A bus standard for connecting P acket O ver SONET link layer devices to PHY sical layer ones.
POS-PHY level 2 was based loosely on UTOPIA level 2.
POTS (P lain O ld T elephone S ervice ): The ubiquitous, 64 kbps phone service widely deployed in today's phone
networks.
PPP (P oint-to- P oint P rotocol ): A link protocol that allows for transport of many network protocols over a
point-to-point link. PPP has very little overhead (1 or 2 bytes per packet), making it very attractive for some
applications.
RAM (R andom A ccess M emory ): RAM is the main memory in the computer. It is called “random” because any
random address can be accessed in an equal amount of time.
RTCP (R eal- T ime C ontrol P rotocol ): The control protocol for RTP, RTCP is used for control and diagnostic on RTP
sessions. Like RTP, RTCP typically runs on top of UDP and is defined in the IETF RFC1889.
RTP (R eal- T ime P rotocol ): A transport protocol designed to provide end-to-end delivery services for data with
real-time characteristics. RTP typically runs on top of UDP. Defined in the IETF RFC1889.
SNAP (S ub N etwork A ccess P rotocol ): A SNAP header consists of 5 bytes, three bytes of OUI (Organizationally
Unique Identifier) and 2 bytes of PID (Protocol IDentifier). The OUI defines which organization administers the PID
that follows. The value of 000000h in the OUI means that the PID is defined as an EtherType.
TCP (T ransmission C ontrol P rotocol ): A transport layer, TCP is a highly reliable host-to-host protocol that
guarantees packet delivery, non-duplicated and in order. TCP runs on top of IP. Defined in IETF RFC791 & STD7.
TDM (T ime D ivision M ultiplexing ): TDM busses carry voice data divided according to frames. In a single 125 us
frame, the TDM bus will have carried one byte from each channel it contains.
UDP (U ser D atagram P rotocol ): A transport layer, UDP provides a protocol for applications to communicate with a
minimum of overhead. UDP does not guarantee packet delivery or ordering. UDP runs on top of IP. Defined in IETF
RFC768 & STD6.
UTOPIA (U niversal T est and OP erations I nterface for A TM ): The electrical interface on which ATM cells are
passed.
VC (V irtual C ircuit ): VC define a point-to-point connection between two nodes in a network. A single ATM cell
carries data that belongs to a single VC.
VCI (V irtual C hannel I dentifier ): This is the label given to an ATM VC to identify it and determine its destination. The
VCI is a 16-bit number that is included in the header of an ATM cell.
VPI (V irtual P ath I dentifier ): A virtual path determines the way an ATM cell should be routed. The VPI is an 8-bit (in
UNI) or 12-bit (in NNI) number that is included in the header of an ATM cell.
WATOMIC: An uninterruptable Write operation.
186
Zarlink Semiconductor Inc.