Chapter 1. Introduction
2
November 2001
At the time of this printing, the ETU-01A had nine types of user-
replaceable data channel modules.
1. ETU/TTU-V35
V.35 Module:
Provides one fully compliant ITU-T V.35
interface on a Female "M" block, 34 pin
connector. Operates at any n56/n64
fractional or unframed E1 speed.
2. ETU/TTU-530
RS-530 Module:
Provides one fully compliant EIA RS-530
interface on a female "D" type 25 pin
connector. Operates at any n56/n64
fractional or unframed E1 speed.
3. ETU/TTU-449
RS-449 Module:
Provides one fully compliant EIA RS-449
interface by placing an adapter cable on
the ETU/TTU-530 module and providing
a male "D" type 37 pin connector.
Operates at any n56/n64 fractional or
unframed E1 speed.
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