Enterasys WPIM-E1 Network Manual page 39

ISDN
JBZS
LEX
LMP
Local Timing
Loop Timing
MIM
MUX
PPP
PRI
PVC
Q.933-A
WPIM-E1 LOCAL MANAGEMENT GUIDE
APPENDIX B: WAN TERMS AND ACRONYMS
Integrated Services Digital Network. Allows point-to-point
connections at 64 Kbps or 128 Kbps when necessary and dis-
connects the line when not in use. With this service the user
only pays for the time connected.
Jam Bit-Zero Suppression, a form of zero suppression that
places a one in the seventh bit of a timeslot. Reduces the effec-
tive throughput to 56 Kbps.
LAN Extender, a Cisco Systems protocol used to internetwork
a host-based router with a remote switch.
Link Management Protocol, used in Frame Relay. Allows the
device to gather information about the DLCIs (Data Link Con-
nection Identifiers) See T1.617-D, Q.933-A.
Timing for digital transmission circuit is internally generated
by a source within the equipment. Usually used for short haul
private lines. In this case one CSU must be set for Local (inter-
nal) timing and the CSU at the other end of the line must be set
for Loop (recovered) timing to create a master-slave situation.
Timing for digital transmission circuit is recovered from the
received data, not generated internally by a source within the
equipment. This is the typical situation when using public
lines.
Media Interface Module, Cabletron Systems products designed
to fit in a Multi Media Access Center (MMAC) hub.
Multiplexer, an electronic device that allows two or more sig-
nals to pass over one communications circuit.
Point-to-Point Protocol, provides a method for transmitting
datagrams over serial point-to-point links.
Primary Rate Interface, an ISDN service providing 23 "B"
(Bearer) channels of 64 Kbps and one 64 Kbps "D" (Data)
channel for signaling and control.
Permanent Virtual Circuit, a virtual circuit that provides the
equivalent of a dedicated private line service.
Q.933 Annex A, an ITU link management protocol specifica-
tion used in Frame Relay.
B-3