Chapter 1. Introduction
5
November 2001
1.2 Functional Description
The ETU-01A is a single port access unit for E1, Fractional
E1 or Fractional cascade (multiplexing) E1 services. The ETU-
01A data channel supports user-selectable transmission rates,
which are integral multiples of 56 or 64Kbps, up to a maximum
2.048Mbps. E1 services operate on a line attenuation of up to 43
dB on twisted pair or coax cable, providing an approximate
operating range of up to 2Km (using 22AWG wire).
The ETU-01A packs the data channel into user defined E1
link time slots. The unused time slots may have IDLE code inserted
(in frame mode) or have the receive side time slots' data inserted
(in cascade mode).
The ETU-01A has nine types of user data channel modules:
V.35, X.21, RS-530, RS-232, RS-449, G.703/64K
Codirectional, NRZ/BNC, 10BASE-T Bridge and 10/100BASE-
TX Router. The desired interface is achieved by installing the
appropriate type of channel module in the ETU-01A. The ETU-
01A supports flexible time slot assignment, allowing the user to
specify the selection of time slots.
The ETU-01A fully meets all of the E1 specifications
including ITU-T G.703, G.704, G.706, G.732, and G.823.
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