ADTRAN DSU III TDM Manual page 121

Appendix F
2047
A pseudorandom test pattern that is repeated every 2047 bits; used to test
DSU/CSUs.
511
A pseudorandom test pattern that is repeated every 511 bits; used to test
DSU/CSUs.
2-wire Switched 56
A Northern Telecom proprietary 56 kbps switched digital data service
offered by telco service providers, and delivered to users over a single pair of
copper wires. Compatible with the ADTRAN DSU III S2W and with the
DSU III TDM 2-wire Switched 56 TDM option.
4-wire Switched 56
An AT&T proprietary 56/64 kbps switched digital data service offered by
telco service providers and delivered to users over 4 copper wires. Compati-
ble with the ADTRAN DSU III S4W and with the DSU III TDM 4-wire
Switched 56 TDM option.
asynchronous
A method of data transmission which allows characters to be sent at irregular
intervals by preceding each character with a start bit, followed by a stop bit.
AT&T Publication 41458
An AT&T specification titled "Special Access Connections to the AT&T
Communications Network," used to design compatibility into DSU/CSU
products.
AT&T Publication 62310
An AT&T specification titled "Digital Data System Channel Interface Speci-
fication," used to design compatibility in DSU/CSU products.
61200063L1-20
Glossary
DSU III TDM User Manual F-1