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Glossary-35
PacketStar
®
PSAX 12-Port Medium-Density DS1 Multiservice Module User Guide
, Issue 1
Release 8.0
Glossary
loop emulation
This service uses the ATM AAL2 network to essentially create
an extension cord between voice ports on the CPE and the
corresponding voice ports on the class 5 switch, that termi-
nates on the GR-303 based voice gateway. The interface
between the CPE and the first ATM-based edge switch or
DSLAM may be T1 or xDSL. In either case, the use of AAL2
allows multiple voice circuits to be carried simultaneously.
loop start interface
A type of interface in which the CPE signals an off-hook con-
dition by closing a relay at the CO.
loopback
A test pattern sent and returned to the sending device to diag-
nose problems.
LOS
loss of signal. A condition at the receiver or a maintenance
signal which is transmitted in the physical overhead and indi-
cates the receiving equipment has lost the received signal.
LOS is used to monitor the performance of the physical layer.
loss of signal
See LOS.
M
MAC
media access control. A protocol that determines how devices
will share resources on a local area network
MAC address
The built-in hardware address of a device connected to shared
media.
management information base
See MIB.
mask
A field comprised of letters or numbers and wildcard charac-
ters, used to filter data. For example, a mask 800xxxxxxx
may be applied to the dialed digits field of a call record to
identify toll-free calls.
max PD parameter
Located on the remote end peer, the Max PD parameter is the
maximum number of protocol data units transmitted since
the last PSAX chassis polling of the peer.
maximum burst size
See MBS.
maximum input buffer
The maximum amount of bytes that should be retrieved.
maximum transmission unit
See MTU.
Mb
A megabit, defined as 1,048,576 bits.
MB
A megabyte, defined as 1,048,576 bytes.
Mbps
Megabits per second, a unit for measuring data rates.
MBS
maximum burst size. In an ATM transmission, MBS is the
maximum number of cells that can be received at the peak
cell rate (PCR). If the burst is larger than anticipated, the
additional cells are either tagged or dropped. MBS applies
only to variable bit rate (VBR) traffic. It does not apply to con-
stant bit rate (CBR) or unspecified bit rate (UBR) traffic.
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