Verilink Access Manager 2000 (896-502037-001) Product Manual - Manual (Page 350)

A-18 Access Manager 2000 Manual
Superframe The superframe framing format divides a 1.544 Mbps DS-1 (T1) line
into two major sections and contains 24 frames:
(1) Traffic and signalling [1.536 Mbps] --- Divided into 24 DS0
(64 kbps) channels in one frame.
(2) Framing [8 kbps]
SF is the predecessor of ESF and still is used when ESF in not
available.
Synchronous A method of transmission where an uninterrupted block of data is sent.
Each block is preceded by one or more sync characters to synchronize
the receiver with the datastream.
System Node All modules (NCC, TACs, DIUs, TIUs) controlled by a master node
controller (NCC) through the Access Manager or ASCII terminal
operator interface. Each master NCC in a node performs these control
functions. Each node can have up to 30 modules in any combination.
T
T1 A 24 channel, 1.544 Mhz bit stream used for data transmission. T1 uses
two twisted pair conductors to accomplish full duplex transmission.
TAC T1 Aggregate and Channel Service Unit Module.
Telco See Telephone Company.
Telephone Company A company that provides its customers with a communications line
whether digital or analog.
Telephone Company
Register A DS-1 performance data register from which either a Telco or
customer operator can retrieve data, but only a telco operator can reset.
Terminal A computer terminal is an input/output device whereby a user is able to
communicate directly with a computer. A terminal must have a
keyboard and a display
Twisted Pair A pair of insulated conductors that are twisted around each other,
mainly to reduce the effects of electrical noise. Twisted pair is typical
of standard telephone T1 wiring.
Term Definition