PairGain PG-Flex FLL-712 User manual

PG-FLEX 24 CHANNEL
CENTRAL OFFICE TERMINAL
LINE UNIT
Model List Number Part Number CLEI Code
FLL-712 3A 150-1312-31 VACHDFLCAA
PAIRGAIN TECHNOLOGIES, INC.
ENGINEERING PLANT SERIES TECHNICAL PRACTICE
SECTION 363-712-131-01
Revision History of this practice.
Revision 01—February 24, 1998
A) Initial Release

Section 363-712-131-01 February 24, 1998 Revision 01
ii PairGain Engineering - Plant Series PG-Flex FLL-712 List 3A
TABLE OF CONTENTS
A. PRODUCT OVERVIEW................................................................................................................1
1. Description and Features....................................................................................................1
2. Front Panel........................................................................................................................2
3. Specifications....................................................................................................................4
B. FUNCTIONAL DESCRIPTION.....................................................................................................5
4. Applications ......................................................................................................................5
5. Operational Capabilities ....................................................................................................6
6. Terminal Management.......................................................................................................8
C. INSTALLATION AND TEST........................................................................................................14
7. Unpacking........................................................................................................................14
8. Installation........................................................................................................................14
9. Provisioning .....................................................................................................................15
10. Troubleshooting..............................................................................................................39
D. TECHNICAL SUPPORT................................................................................................................40
11. Technical Support...........................................................................................................40
E. CERTIFICATION AND WARRANTY.........................................................................................41
12. Certification....................................................................................................................41
13. Warranty.........................................................................................................................41
F. ABBREVIATIONS AND GLOSSARY..........................................................................................42
14. Abbreviations .................................................................................................................42
15. Glossary..........................................................................................................................42
USING THIS TECHNICAL PRACTICE
Two types of messages, identified by icons, appear in the text:
A note informs you of special circumstances.
Cautions indicate the possibility of damage to equipment or the possibility of
personal injury.
Copyright 1998 PairGain Technologies, Inc.
PairGain is a registered trademark, and PG-Flex is a trademark of PairGain Technologies, Inc.
Information contained in this document is Company Private to PairGain Technologies and shall not be modified, used, copied,
reproduced, or disclosed in whole or in part without the written consent of PairGain.
Other product names mentioned in this practice are used for identification purposes only and may be trademarks or registered
trademarks of their respective companies.

Revision 01 February 24, 1998 Section 363-712-131-01
PG-Flex FLL-712 List 3A PairGain Engineering - Plant Series Page 1
A. PRODUCT OVERVIEW
1. Description and Features
1.1 The PairGain
®
PG-Flex  FLL-712 List 3A Central Office Terminal (COT) line unit is located at the
Central Office (CO) end of the PG-Flex subscriber carrier system, and transports up to 24 DS0
subscriber channels between a COT and a Remote Terminal (RT). The FLL-712 resides in a
PairGain COT 19- or 23-inch shelf. Each system in the shelf requires one FLL-712 COT line unit.
The FLL-712 provides access through its Craft port to provision a PG-Flex system using an ASCII
terminal. However, installing an FAU-728 List 2 or an FPI-729 unit in the shelf disables the Craft
port on the FLL-712 line unit. The FPI-729 unit then provides access through its Craft port to
provision the PG-Flex system through an ASCII terminal.
The FLL-712 COT line unit uses PairGain’s High-bit-rate Digital Subscriber Line (HDSL) 2B1Q
technology to provide the equivalent of 1.544 Mbps digital transmission rates, plus signaling over
two copper pairs. The HDSL line can include unterminated bridge taps. The technology is
implemented:
•without using repeaters
•without loop conditioning
•without pair selection
The FLL-712 supports the use of PG-Flex doublers to extend the range of a PG-Flex subscriber
carrier system to 24 kft (7.3 km) of 24 AWG or 18 kft (5.4 km) of 26 AWG loops. Two doublers can
triple the range to 36 kft (10.9 km) of 24 AWG or to 27 kft (8.2 km) of 26 AWG loops.
1.2 The FLL-712 COT line unit:
•supports 24 subscriber channels in the CO
•supports PG-Flex doublers in systems transporting POTS and ISDN circuits
•supports 4Tel compatible Loop Test Systems
•is compatible with Mechanized Loop Testing (MLT) and the Pair Gain Test Controller (PGTC)
when an FP1-729 List 1 PGTC Interface Unit is installed in the shelf
•supports ISDN channel units
•supports loop start/ground start channel units

Section 363-712-131-01 February 24, 1998 Revision 01
Page 2 PairGain Engineering - Plant Series PG-Flex FLL-712 List 3A
2. Front Panel
Figure 1 shows the FLL-712 line unit front panel. Table 1 lists the indicators and indicator states for
the FLL-712 front panel LEDs.
Figure 1 . FLL-712 List 3A Front Panel

Revision 01 February 24, 1998 Section 363-712-131-01
PG-Flex FLL-712 List 3A PairGain Engineering - Plant Series Page 3
Table 1. FLL-712 Front Panel LEDs
LED LED State Indicates
PWR Solid Green Power applied and line feed operating normal.
Flashing Green Power applied to the RT and testing for overloads.
OFF Not receiving power. COT line unit fuse may be blown.
LOOP 1 SYNC Solid Green HDSL line 1 is in sync between the COT and RT.
Flashing Green HDSL line 1 is attempting to sync with remote unit.
OFF HDSL line 1 does not detect an active remote unit.
LOOP 1 MARGIN Solid Yellow HDSL line 1 is below preset margin threshold.
OFF HDSL line 1 margin is above the preset margin threshold.
LOOP 2 SYNC Solid Green HDSL line 2 is in sync between the COT and RT.
Flashing Green HDSL line 2 is attempting to sync with remote unit.
OFF HDSL line 2 does not detect an active remote unit.
LOOP 2 MARGIN Solid Yellow HDSL line 2 is below preset margin threshold.
OFF HDSL line 2 margin is above the margin threshold.
TEST Flashing Yellow Test in progress.
OFF No tests active in system.
FAULT Solid Red System alarm/fault detected.
OFF No faults are detected in system.

Section 363-712-131-01 February 24, 1998 Revision 01
Page 4 PairGain Engineering - Plant Series PG-Flex FLL-712 List 3A
3. Specifications
Electrical Characteristics
COT Power Supply Input Voltage............... -40 to -72 Vdc
COT Power Supply Input Power.................145 Watts (maximum)
COT Power Supply Input Protection...........Fuse (3A GMT)
COT Power Supply Output Voltage............± 130 Vdc (maximum)
COT Power Supply Output Power...............100 Watts (maximum)
Environmental
Operating Elevation.................................... -200 ft to 13,000 ft (-60 m to 4,000 m)
Operating Temperature & Humidity ........... -40° F to +150° F (-40° C to +65° C)
5% to 95% (non-condensing)
Physical
Dimensions
Height:................................................. 6.7 in. (17.2 cm)
Width:.................................................. 2.0 in. (5.1 cm)
Depth:.................................................. 10.5 in. (26.7 cm)
Weight........................................................ 2.0 lb. (0.9 kg)

Revision 01 February 24, 1998 Section 363-712-131-01
PG-Flex FLL-712 List 3A PairGain Engineering - Plant Series Page 5
B. FUNCTIONAL DESCRIPTION
4. Applications
4.1 Overview. PG-Flex is a small-capacity, universal subscriber carrier system supporting up to
24 DS0 channels including both Plain Old Telephone Service (POTS) and Integrated Services Digital
Network (ISDN) services. The system is based on HDSL transmission technology. Remote power is
supplied from the Central Office (CO).
A PG-Flex system is comprised of one line unit and one (or more) channel units at both the CO and
the RT (Figure 2). Line units and channel units can be hot-swapped without affecting other systems
in the same shelf. The POTS channel units use a Pulse Code Modulation (PCM) encoding scheme
that allows high speed modem and group 3 facsimile operation on all channels.
The CO-side of a PG-Flex system mounts into a COT shelf and supports up to four systems. An
alarm unit or Pair Gain Test Controller (PGTC) interface unit (common to all systems installed in the
shelf) provides an interface for maintenance alarm relays and metallic access to the remote
subscriber lines.
The remote side of a PG-Flex systems mounts into an FRE-765 RT enclosure. The RT enclosure
supports one system, which includes one line unit and up to three channel units. The channel units
must be the same type of card as the channel units installed at the CO.
PG-Flex uses HDSL transmission technology over two unconditioned copper pairs. Power is
supplied from the CO to the RT over the HDSL transmission lines. The maximum distance from the
CO to the RT is 12.3 kft (3.7 km) using 24 AWG cable (0.5 mm).
Figure 2. Typical PG-Flex Configuration
4.2 HDSL Transmission. PG-Flex uses HDSL transmission technology between the COT and RT.
This technology provides up to 24 DS0s, plus signaling, over two copper pairs without using
repeaters, loop conditioning, or pair selection. Adaptive equalization, scrambling, and a four-level
2B1Q line coding scheme increase range and minimize crosstalk.
The line interface is a two-pair, 784-kbps full-duplex 2B1Q transmission format. The dual HDSL
lines provide 24 channels at 64-kbps, with signaling and an operations channel for management
control. The signal characteristics on the carrier pairs comply with TR-NWT-001210, Generic
Requirements for High-bit-rate Digital Subscriber Line (HDSL) Systems.

Section 363-712-131-01 February 24, 1998 Revision 01
Page 6 PairGain Engineering - Plant Series PG-Flex FLL-712 List 3A
Table 2 shows the maximum distance between the COT and the RT for various gauge wire. Because
of HDSL transmission technology, the HDSL lines require no special conditioning and may include
unterminated bridge taps, but cannot include load coils.
Table 2. PG-Flex Distances
Loop Length
Wire Gauge 12/24 Channel System DC Resistance
26 AWG (0.4 mm) 9.0 kft (2.8 km) 750 Ω
24 AWG (0.5 mm) 12.3 kft (3.8 km) 638 Ω
22 AWG (0.6 mm) 16.1 kft (5.0 km) 521 Ω
19 AWG (0.9 mm) 22.8 kft (7.0 km) 367 Ω
Do not share metallic bypass pairs between PG-Flex systems and between
PG-Flex and other Digital Loop Carrier (DLC) systems.
4.3 Subscriber Drop Testing. For subscriber drop testing from the Central Office, PG-Flex is able to
select and connect any subscriber drop to a metallic bypass pair at the RT. PG-Flex extends this
connection back to the COT where it is switched to the test jack on the FAU-728 or FPI-729 units or
to the corresponding subscriber line on the COT channel card.
Metallic access is performed by momentarily placing +116 Vdc (from the CO) on the subscriber’s
Tip lead. (The Ring lead should be between GND and the Tip value.) With POTS, Ground
Start/Loop Start, and ISDN channel cards, the selected subscriber drop (assuming a working metallic
bypass pair) connects to the corresponding COT subscriber line.
The metallic connection drops when -116 Vdc is momentarily applied to the subscriber’s COT Tip
lead.
Metallic access may also be activated through an ASCII terminal connected to the RS-232
Maintenance port located on the front of the FLL-712 line unit or through the FAU-728 List 2 or
FPI-729 units.
5. Operational Capabilities
5.1 The FLL-712 COT line unit provides the following functions for each 24-channel system in a single
COT shelf:
•system power supply
•HDSL line transceivers and simplex RT power
•front-panel status indicators
•RS-232 Maintenance Interface (DCE)
•switched access to the metallic bypass pair
•MLT/PGTC loop test system compatibility
•4Tel loop test system compatibility

Revision 01 February 24, 1998 Section 363-712-131-01
PG-Flex FLL-712 List 3A PairGain Engineering - Plant Series Page 7
5.2 Figure 3 shows a block diagram of the FLL-712. The power supply converts CO battery into
voltages necessary to power the PG-Flex electronics including ±130 Vdc. During power-up, the
system checks the HDSL lines for hazardous voltages or other line faults that may effect the system.
If a fault condition is detected, the system stops the power-up sequence and the LED indicators on
the front panel indicate a line fault problem.
Figure 3. FLL-712 COT Line Unit Block Diagram

Section 363-712-131-01 February 24, 1998 Revision 01
Page 8 PairGain Engineering - Plant Series PG-Flex FLL-712 List 3A
6. Terminal Management
6.1 The terminal management function allows a technician to manage the entire PG-Flex system using
an ASCII terminal (or modem with a null modem cable) connected to the Craft port. With this
function, you can:
•view system status
•set configuration parameters
•set metallic access connection to the subscriber circuit
•monitor system performance
•obtain an inventory report
6.2 Connecting FLL-712 to a Terminal or Modem. Figure 4 shows the pinouts for connecting the
FLL-712 Craft port to an ASCII terminal.
The FLL-712 line unit will not automatically log off when a terminal is unplugged
from the craft maintenance port unless the DTR signal is connected between
the terminal and the Craft port. Technicians must manually log off the line unit
before unplugging from the port. Otherwise, the line unit remains logged in,
and the terminal session will still be in the same place.
Figure 4. Connecting FLL-712 to an ASCII Terminal

Revision 01 February 24, 1998 Section 363-712-131-01
PG-Flex FLL-712 List 3A PairGain Engineering - Plant Series Page 9
Figure 5 shows the pinouts for connecting the FLL-712 to a modem using a null-modem cable.
Using Data Carrier Detect (DCD) from the modem ensures that the FLL-712 line unit logs off if the
carrier signal disappears.
When configuring a modem, ensure that either the DIP switches or the software configuration is set
OFF for Carrier Detect (CD) override. This causes the modem to send CD signal when it connects
with another modem and to drop CD when it disconnects. Otherwise, if set ON, the FLL-712
connection functions correctly but does not log out when disconnected.
It is recommended that Data Terminal Ready (DTR) override be OFF. This allows a modem call
to terminate correctly when the FLL-712 drops DSR (which is null-modemed to DTR input on
the modem).
Figure 5. Connecting the FLL-712 to a Modem
The connection is set up as:
•DCE with 8 data bits
•1 stop bit
•no parity
•1200 to 9600 baud (9600 baud recommended)
The protocol requires DTR active from the terminal to prevent automatic log off.

Section 363-712-131-01 February 24, 1998 Revision 01
Page 10 PairGain Engineering - Plant Series PG-Flex FLL-712 List 3A
6.3 Menus and Display Structure. Figure 6 shows the menu structure of the terminal management
system.
Figure 6. Terminal Menu and Display Structure

Revision 01 February 24, 1998 Section 363-712-131-01
PG-Flex FLL-712 List 3A PairGain Engineering - Plant Series Page 11
6.4 Power-Up and Connection Screen. The Power-Up and Connection screen display once the
ASCII terminal has been connected to the FLL-712 line unit:
6.5 Log On Screen. The FLL-712 line unit displays a log on screen when it detects user input from
the Craft port (while idle).
1Press the <Spacebar> rapidly several times to start the autobaud feature (autobaud supports
transmission rates of 1,200, 2,400, 4,800 and 9,600 bps only). This input causes the
log on screen to display:
2Enter your password. For security reasons, the password input is echoed with "*" characters.
If you do not have your logon password, contact the Customer Service
Engineering group (see Technical Support) for access using a Master
Password.

Section 363-712-131-01 February 24, 1998 Revision 01
Page 12 PairGain Engineering - Plant Series PG-Flex FLL-712 List 3A
6.6 System Time Set Screen. The System Time screen appears the first time you log on, or after the
power has been turned off. Enter the new system time in hours (HH), minutes (:MM), and seconds
([:SS]):
This screen will not appear the next time you log on unless the power has been turned off.
6.7 Main Menu. From the Main Menu, you access other menus where you can configure a PG-Flex
system, initiate or view test procedures, and view status information. The Main Menu is displayed
after a successful log on:

Revision 01 February 24, 1998 Section 363-712-131-01
PG-Flex FLL-712 List 3A PairGain Engineering - Plant Series Page 13
Table 3 describes the Main Menu options (A through D).
Table 3. Main Menu Options
Main Menu Option Function
A) Status Select the Status option (A) from the Main Menu to display:
•System Status to show the equipment installed in the system and the current status (in alarm or
not) of the equipment.
•Channel Status to show the current status of all channels in the system. Each channel has a status
condition. Status conditions vary for the different types of channel cards. Examples of status are:
IDLE: channel is not off-hook or ringing
RING: channel is ringing
BUSY: channel is off-hook
OPEN: no connection to CO switch
TEST: in test mode
TREQ: 116 Vdc test request
SERR: PCM bus frame sync error
FIDL: forced idle
TDSB: time slots disabled
RBAT: reverse battery
****: unknown
•HDSL Status to show the status of the HDSL span. You can view either a 24-hour or 7-day
performance history.
•Alarm History to display the status history of COT, RT, and span alarms.
•ISDN Performance Monitoring Menu to show PM error count and PM threshold for a specific
ISDN card and channel.
B) Setup Select the Setu
p
o
p
tion (B) from the Main Menu to view the current setu
p
or to set or chan
g
e the
following configurable items:
•System Setup
•Time Slots Assignment (view only)
•Channel Configuration
•POTS Loop/Ground Start Setup
•ISDN Channel Setup
C) Maintenance Select the Maintenance o
p
tion (C) from the Main Menu for settin
g
u
p
a metallic access connection to
a subscriber circuit or
p
erformin
g
an ISDN loo
p
back test for a PG-Flex s
y
stem. Metallic Access
includes: COT brid
g
in
g
, COT lookin
g
in, COT lookin
g
out, RT lookin
g
out, RT lookin
g
in, RT
bridging, and subscriber bypass.
D) Inventory Select the Inventor
y
o
p
tion (D) from the Main Menu to view manufacturin
g
information and version
information for all the units in the s
y
stem (exce
p
t the FAU/FPI unit). At the CO line unit terminal or
the RT line unit terminal, the command displays all units in the system.

Section 363-712-131-01 February 24, 1998 Revision 01
Page 14 PairGain Engineering - Plant Series PG-Flex FLL-712 List 3A
C. INSTALLATION AND TEST
7. Unpacking
7.1 Upon receipt of the equipment, proceed as follows:
1Unpack each container and visually inspect it for signs of damage. If the equipment has been
damaged in transit, immediately report the extent of damage to the transportation company and
to PairGain. Order replacement equipment if necessary.
2Check the contents versus the packing list to ensure complete and accurate shipment. If the
shipment is short or irregular, contact PairGain as described in Section 11. If you must store the
equipment for a prolonged period, store the equipment in its original container.
8. Installation
Observe normal electrostatic discharge precautions when handling electronic
equipment. Do not hold electronic plugs by their edge. Do not touch
components or circuitry.
An FPI-729 List 1 PGTC Interface Unit or an FAU-728 List 2 Alarm Unit must be
installed at all times when ISDN channel units are installed. These units
provide the composite clock reference source for the ISDN channel units and
are required for normal operation of the ISDN channel units. Removing the FPI-
729 List 1 or FAU-728 List 2 during an ISDN call terminates the call.
8.1 Install a FLL-712 COT line unit and verify operation as follows:
1Insert the FLL-712 COT line unit into the COT shelf and verify:
•all LEDs on the Line Card turn on for about one-half second, then turn off
•PWR and FAULT LEDs turn on
•after ten seconds, the COT starts its power management routine and the PWR LED flashes
If line powering fails, wait one minute before attempting to reinsert the FLL-712.
If line powering succeeds, HDSL communications begins synchronizing and
LOOP 1 SYNC and LOOP 2 SYNC flash.
2Verify the following front panel indications after the system powers up and establishes HDSL
synchronized communications, and when no calls are in progress:
•POWER is on
•LOOP 1 SYNC is on
•LOOP 1 MARGIN is off
•LOOP 2 SYNC is on
•LOOP 2 MARGIN is off
•TEST is off
•FAULT is off

Revision 01 February 24, 1998 Section 363-712-131-01
PG-Flex FLL-712 List 3A PairGain Engineering - Plant Series Page 15
3Measure the following voltages on the COT shelf backplane:
•-130 Vdc (±10%) between the HDSL_T1 pin and chassis ground
•0 Vdc to +130 Vdc between the HDSL_T2 pin and chassis ground
9. Provisioning
9.1 Configure System Settings. Perform system setup, if not previously accomplished.
1Type <B> then press <Enter> at the Main Menu. The Setup Menu is displayed:

Section 363-712-131-01 February 24, 1998 Revision 01
Page 16 PairGain Engineering - Plant Series PG-Flex FLL-712 List 3A
2Type <A> then press <Enter>. The System Settings menu is displayed:
3Type a letter (A through N) and press <Enter> to select a parameter to change. Refer to
Table 4 for system settings menu options.
You get a separate screen for the parameter selected. It prompts you to input the change.
4Type <Ctrl+X> to return to the Main Menu.

Revision 01 February 24, 1998 Section 363-712-131-01
PG-Flex FLL-712 List 3A PairGain Engineering - Plant Series Page 17
Table 4. System Settings Menu Options
Parameter Default Value Description
A) System Date 01-JAN-00 The S
y
stem Date is set for each PG-Flex s
y
stem individuall
y
and dis
p
la
y
s as dd-mmm-
yy
. It increments automaticall
y
each
midni
g
ht, as lon
g
as the COLU and RTLU are installed in the
shelf and CO batter
y
is connected to the COLU. If the COLU
or the RTLU is removed from a
p
owered shelf, then reinserted,
the date will be the same as it was when the COLU or RTLU
was
p
ulled out of the shelf or when its
p
ower was removed. It
then continues to increment to successive dates each midni
g
ht,
as indicated b
y
the S
y
stem Time. All
y
ears which are evenl
y
divisible b
y
4 (includin
g
the default
y
ear "00") are considered
lea
p
y
ears. In such
y
ears, the date increments from 28-FEB-
yy
to 29-FEB-
yy
(where "
yy
" re
p
resents the last two di
g
its of the
year, such as 00, 04, 08, etc.).
This
p
roduct meets or exceeds the current technical
q
ualit
y
re
q
uirements for Year 2000 com
p
liance and
p
ro
p
erl
y
p
rocesses
dates up to, and beyond, December 31, 1999.
B) System Time 00:00:00 at power on The S
y
stem Time must be set for each PG-Flex s
y
stem
individuall
y
and dis
p
la
y
s as hh:mm:ss. S
y
stem Time is lost
(default back to 00:00:00) whenever
p
ower is removed from
the s
y
stem shelf or the COLU or RTLU module is removed
and reinserted.
C) System ID (all spaces) The S
y
stem ID is su
pp
lied to indicate the
p
h
y
sical location of
the PG-Flex s
y
stem (CO or RT terminal). Each PG-Flex
s
y
stem should have a uni
q
ue S
y
stem ID. The default for
S
y
stem ID is "blank" (all s
p
aces). This can be left blank or set
to an
y
desired name of 24 or fewer characters (includin
g
s
p
aces). This name can be an
y
mixture of al
p
hanumeric
characters (includin
g
u
pp
er case, lower case, numerals,
p
unctuation, etc.). If S
y
stem ID is set to "shelf 25 s
y
stem A",
this ID a
pp
ears at the to
p
of each screen when accessin
g
this
s
y
stem. This
p
arameter is stored in the CO line unit NVRAM
and therefore does not chan
g
e when
p
ower is c
y
cled or cards
are removed and reinserted. If the CO line unit is re
p
laced, it
is necessary to reenter the appropriate system ID.
D) Set Password (all spaces) If there is an FPI card
p
resent in the s
y
stem,
y
ou will be
connected to the s
y
stem throu
g
h the connector on the FPI card
front
p
anel and will be
p
rom
p
ted for a
p
assword onl
y
on initial
lo
g
on to the FPI card, before accessin
g
a s
p
ecific s
y
stem in
the shelf. You will not be asked for an additional
p
assword
when accessin
g
a s
y
stem. However if there is no FPI card,
y
ou
will connect to each s
y
stem individuall
y
throu
g
h its front
p
anel connector and will be
p
rom
p
ted for the individual
s
y
stem Password. The Password default is <ENTER>. The
p
assword can be 10 or fewer characters (includin
g
s
p
aces), or
an
y
mixture of al
p
hanumeric characters (includin
g
u
pp
er case,
lower case, numerals, and
p
unctuation marks). This
p
arameter is stored in the CO line unit card NVRAM and
therefore will not chan
g
e when
p
ower is c
y
cled or cards are
removed and reinserted.
(continued on next page)

Section 363-712-131-01 February 24, 1998 Revision 01
Page 18 PairGain Engineering - Plant Series PG-Flex FLL-712 List 3A
Table 4. System Settings Menu Options (continued)
Parameter Default Value Description
All of the parameters discussed in the remainder of this table are stored in the CO line unit card NVRAM
and therefore will not normally change when power is cycled or cards are removed and reinserted.
E) Auto Logout Time DISABLED After lo
gg
in
g
on to a s
y
stem,
y
ou are automaticall
y
lo
gg
ed out
after a time determined by the Auto Logout Time parameter:
• DISABLED: The user is never automatically logged out.
(Note: If the user leaves the system without logging out,
and if Auto Logout Time is "DISABLED", the next
person who accesses the system can do so without
logging on and does not need a password).
• 5: Automatically logs out after 5 minutes.
• 30: Automatically logs out after 30 minutes.
• 60: Automatically logs out after 60 minutes.
F) Metered Tone
Frequency
12 Metered tones are used for out-of-band si
g
nalin
g
with coin
tele
p
hones, t
yp
icall
y
in international markets. A s
p
ecial
channel card is required to support this function.
G) Ring Frequency 20 Determines the fre
q
uenc
y
of the rin
g
in
g
volta
g
e on the
subscriber line. The values can be set to one of the followin
g
parameters:
• 20: The ring generator is set to 20 Hz.
• 25: The ring generator is set to 25 Hz.
• 30: The ring generator is set to 30 Hz.
H) HDSL ES Alarm
Threshold
DISABLED Sets the number of Error Seconds re
q
uired before a minor
alarm is
g
enerated (de
p
endent on the settin
g
of the Alarm on
HDSL Threshold
p
arameter). The count of Error Seconds is
reset to zero when the reset function is used on the HDSL
Performance Histor
y
status screen. The values can be set to
one of the following parameters:
• DISABLED: No minor alarm is generated, regardless of
the number of error seconds.
• 17: A minor alarm is generated after 17 error seconds.
• 170: A minor alarm is generated after 170 error seconds.
(continued on next page)