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5. CONTROL PORT OPERATION
The HTU-C provides a faceplate-mounted DB9 connector
that supplies an RS-232 interface for connection to a
controlling terminal. The pinout of the DB9 is illustrated
in Figure 6.
1
6
2
TXD (Transmit Data)
7
3
RXD (Receive Data)
8
4
9
5
SGN (Signal Ground)
Figure 6. RS-232 (DB9) Pin Assignments
The terminal interface operates at data rates from 1.2
kbps to 19.2 kbps. The asynchronous data format is
fixed at 8 data bits, no parity, and 1 stop bit. The
supported terminal type is VT 100 or compatible.
Many portable personal computers use power-saving
programs that are known to interfere with applications
Abbreviation
Definition
ES
Errored Seconds
SES
Severely errored seconds.
UAS
Unavailable seconds
SF
Superframe format.
ESF
Extended superframe format.
B8ZS
Binary 8 zero substitution.
AMI
Alternate mark inversion.
LBO
Line build-out.
BPV
Bipolar violation.
NIU
T1 Network Interface Unit.
S/N
Serial number.
15M
Fifteen-minute period.
24H
Twenty-four-hour period.
6
Table D. Screen Abbreviations
DSX/DS1 .................. SF: Second in which a BPV or frame bit error occurs.
ESF: Second in which a BPV or CRC error occurs.
HDSL ........................ Second in which a CRC error occurs.
DSX/DS1 .................. SF: Second in which 1544 BPVs or 8 frame bit errors occurs.
ESF: Second in which 1544 BPVs or 320 CRC errors occur.
HDSL ........................ Second in which 165 CRC errors occurs.
DSX/DS1 .................. Second in which there is a loss of signal or sync.
HDSL ........................ Second in which there is a loss of signal or sync.
DSX/DS1 .................. Second in which a bipolar violation occurs.
Section 61245001L7-5, Issue 1
running on the personal computer. If using a portable
personal computer with terminal emulation capability,
communication between the computer and the HDSL
unit may be periodically disrupted if power saving
programs are being used on the personal computer.
The symptoms may include misplaced characters
appearing on the screen and/or the occurrence of screen
timeouts. These symptoms are not disruptive to the
operation of the circuit and are avoidable if the power
saving options are disabled or removed.
When operating the unit in the ADTRAN E220 Shelf
with an HFAC (HDSL shelf controller), all remote
terminal operation must be made through the control
port of the shelf controller, not the HTU-C.
Operation
For abbreviations used in the screen diagrams, see
Table D.
The screens illustrated in Figures 7 through 14 are for an
HDSL circuit deployed with ADTRAN's Low Voltage
HDSL technology.
The circuit includes an HTU-C,
61245.001L7-5A
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