Panasonic 1200N User Manual

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Glossary
B-66
Centillion 1200N ATM Switch User Manual
NTP 297-8103-903
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SA 
Source Address: The address from which the message or data originated. 
SA 
Source MAC Address: A six octet value uniquely identifying an end point and 
which is sent in an IEEE LAN frame header to indicate source of frame. 
SAAL 
Signaling ATM Adaptation Layer: This resides between the ATM layer and the 
Q.2931 function. The SAAL provides reliable transport of Q.2931 messages 
between Q.2931 entities (e.g., ATM switch and host) over the ATM layer; two 
sublayers: common part and service specific part. 
SAP 
Service Access Point: A SAP is used for the following purposes: 
When the application initiates an outgoing call to a remote ATM device, a 
destination_SAP specifies the ATM address of the remote device, plus further 
addressing that identifies the target software entity within the remote device.
When the application prepares to respond to incoming calls from remote ATM 
devices, a local_SAP specifies the ATM address of the device housing the 
application, plus further addressing that identifies the application within the 
local device. There are several groups of SAPs that are specified as valid for 
Native ATM Services. 
SAR 
Segmentation and Reassembly: Method of breaking up arbitrarily sized packets. 
SC
Subscriber loop system optical fiber Connector: It’s a system that allows one pair 
of wires, that would normally provide one phone line, to carry multiple 
conversations. Various models are available, with capacity ranging from 2 to 96 
lines. A SC or (SLCC) is used between phone company central offices and areas 
where there are too many customers for the cable that is in place. It’s much less 
expensive to install SLCCs than new cable, but the SLCC provides lower-than-
normal line voltage, which may cause some phones to malfunction.