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Module Descriptions:
TL180 Control Logic:
CL180/PRI:
PRI control logic consisted of six modules, It was designed for
use in point-to-point applications involving asynchronous channels.
It provided seven basic clock rates and local central logic status.
CL180/PRI-1:
PRI-1 control logic had all the features of PRI logic plus remote
status reporting.
CL180/PRI-2:
PRI-1 control logic had all the features of PRI logic plus:
TL180 Channel Adapters:
CA180/FDX-3:
channel interfaces for asynchronous channels at speeds up to 1,800
bps; the interfaces could be dedicated or dial-up and provided
error detection, display and diagnostics
CA180/ABR:
channel interfaces for asynchronous channels with the ability
to auto-detect input speeds up to 1,200 bps
CA180/2CURR:
dual channel interfaces for asynchronous channels equipped with
current loop interfaces at speeds up to 75 baud (Bell 83B3 selective
calling networks)
CA180/2FDX-DS:
dual channel interfaces for asynchronous channels with an integrated
113B answer-only data set; approved for direct network connection
through a CBT/DAA
CA180/2ABR-DS:
dual channel interfaces for asynchronous channels with the ability
to auto-detect input speeds up to 1,200 bps; with an integrated
113B answer-only data set
CA180/201C
a single channel interface used to interface one synchronous channel
at up to 7,200 bps over a dedicated, full-duplex circuit
The primary logic set consisted of seven modules and the secondary
set, six modules. The remaining slots are for a diagnostic module
and nine channel adapter slots. Expansion nests were available
in the versions: one was wired for a driver module and nine channel
adapter slots; the other, for a driver module and 16 channel adapter
slots.
Central logic modules included the bandsplitter, MPU1, scanner,
MPU2, MPU3, low speed clock, and remote. A secondary set of central
logic would have been the same, excluding the remote module.
Optional enhancements could include primary logic that supported
a 9,600 bps high speed line with an input burst rate of 38,400
bps or a 19,2600 bps high speed line with an input burst rate
of 38,400 bps.
Channel adapter modules included:
All the channel adapters supported by the TL180 and the following:
CA780/EIA4:
a single channel interface for asynchronous or synchronous channels
at speeds up to 9,600 bps; the interface could be used with modems
equipped with a supervisory channel such as the Bell 202C/D
CA780/SPC3:
a single channel interface for synchronous channels that use bisynchronous
protocols, such as IBM 2780, 3780, 3270, 360/HASP, or CDC-UT200;
it operated at speeds up to 9,600 bps.
CA780/HSC4:
a single channel interface for dedicated synchronous channels
at speeds up to 9,600 bps; this interface was totally transparent
and not statistically multiplexed with other TL780 channels. Four
EIA control signals could be exchanged, end-to-end.
The TL280 was a synchronous wideband time division multiplexer
used in point-to-point or multipoint operation. It could multiplex
up to 21 channels at 2,400 bps over a single 56,000 bps line.
It had redundant central logic and load-sharing power supplies,
a timing module, and local/remote diagnostic modules.
Module Descriptions:
FLC Module:
maintained bit-count integrity from station to station for short
duration interruptions on the wideband facility.
ETC Module:
provided timing in networks that were not frequency locked
ESC Module:
ETC modules designed to operate at speeds beyond 19,200 bps, including:
V.35, Bell301/303, and EIA interfaces
The TL290 allowed users of Bell 209 modems to switch to the DDS network (and multiplexing) without losing the bandsplitting capability of the 209. It handled up to four channels at speeds up to 7,200 bps and an output of up to 9,600 bps.
The SM480 supported up to 8 asynchronous I/O devices with an aggregate
input of 76,800 bps over a 9,600 bps line. The input speeds ranged
from 50 bps to 9,600 bps. The SM480 was configured by setting
channel DIP switches on the "master" end and downloading
the configuration to the "slave."
The SM480 also provided individual channel flow control through
the use of the X-ON/X-OFF characters or the toggling of EIA interface
control signals. The SM480 also supported auto-detect of the channel
input speed (ABR) up to 1,200 bps.
The SM680 was a microprocessor-controlled statistical multiplexer
used in point-to-point operation. It could multiplex up to 32
channels with an aggregate of 38,400 bps over a single 9,600 bps
line, with an optional module that could be an integrated 4,800
bps or 9,600 bps modem, or a bandsplitter module up to 19,200
bps.
The SM680 had switch-selectable downline loading, diagnostic monitoring,
and status reporting.
Module Descriptions:
CA680/2A4 Module:
a dual channel, asynchronous, RS-232 interface, with data rates
up to 9,600 bps
CA680/2S4 Module:
a dual channel, synchronous, bandsplitter interface, which allocated
bandwidth to synchronous inputs on an "as-needed" basis.