Product specifications

Chapter 1. Introduction
9
May 2011
8. ETU/TTU-NRZ
NRZ Module:
Provides one NRZ interface on four (4) female BNC type
connectors. Operates at any n56/n64 fractional or unframed E1
speed.
9. ETU/TTU-ET100R
Ethernet Router Module:
Provides an Ethernet (IEEE802.3 or IEEE802.3u) Router function
over the WAN when matched to another ET100R module or a
compatible router under PPP, HDLC or cHDLC (Cisco) protocol.
The interface connection is a straight (MDI) 10/100BASE-TX
Ethernet on a shielded RJ-45 connector. Configuration is via RS-
232 terminal, Telnet, or web based GUI interface. Operates at any
n56/n64 fractional or unframed E1 speed.
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 Co-directional, NRZ/BNC, 10/100BASE-TX 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.
The ETU-01A features V.54 loop back capabilities for performing local analog loop back and
remote digital loop back as well as progressive BERT testing. The operator at either end of the line
may test both the ETU-01A and the line in the remote digital loop back mode. The loop back is
controlled by local LCD display setting, serial console, optional SNMP or by the DTE interface for
V.35, RS-232 and RS-530.