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Overview
The System 922 is a completely self-contained backup
phone system that extends the concept of power failure
transfer (PFT) to multiple DS1 T1 or ISDN PRI circuits.
The System 922 goes to work automatically when normal
operation of T1 RBS or ISDN-terminated customer-premise
equipment (CPE) is inhibited due to a power failure,
software problem, or hardware malfunction. When such a
failure occurs the System 922 goes into the transfer
mode, immediately taking control of the T1 or PRI
circuits. Personnel at the site are then able to receive
inbound calls and place outbound calls with minimal
interruption.
The System 922 is connected between customer-premise
equipment and the network connections. It combines the
capabilities of multiple channel banks with integrated
CSUs, an automatic call distributor (ACD), a 2-channel
recorder/announcer, and a 48-station “micro” PBX. Note
that the internal CSU’s functionality is provided for
use by the System 922 only. It is not available for use
by the CPE.
The main component of a System 922 is the Basic
Configuration Unit which consists of either a
wall-mounted or rack-mounted enclosure containing a CPU
card, a dual DS1 interface card, a power supply card,
and six “option” card slots. Depending on the
requirements of the particular application, up to six
938A or 939 analog cards can be installed in the
enclosure. Each 938A analog card provides eight ports
that meet the technical requirements for Off-Premise
Stations (OPS) including 20 Hz bridged ringing,
disconnect signaling, and standard progress tones. The
938A analog card supports the connection of eight DTMF-dial analog telephones or loop start trunk ports of
a key system. The 938A analog card can also support
analog caller ID. The 939 analog card emulates eight FXS
(subscriber) loop start circuits and can answer incoming
analog calls and initiate outbound analog calls.
The System 922 can support both T1 Robbed Bit signaling
and ISDN PRI signaling. When in the transfer mode for T1
Robbed Bit signaling, the System 922 provides
communication for all 24 channels supplied by each of
the network T1 circuits. The channels can be configured
for any combination of inbound, outbound, or two-way
(including two-way DID) signaling.
When in the transfer mode for ISDN PRI, the System 922
maintains D-channel synchronization and supervision,
processing all call traffic “call-by-call” on each DS1
interface. Each of the 23 B channels of the PRI circuit
are dynamically assigned and automatically configured
based upon the requirements of each call presented to
System 922. When the System 922 is in the transfer mode,
incoming calls can be directed to:
• Individual analog
telephones, routed by the System 922 upon predefined
DNIS table match-and-route instructions.
•
Individual CO loop start trunks using the 939 analog
card.
•
Any of up to 32 ACD groups of analog phones, again
routed by the System 922 based upon predefined DNIS
table match-and-route instructions. Each of the ACD
groups has adjustable parameters, including queue and
overflow depth.
•
Calls received by one analog telephone can easily be put
on hold or transferred to another telephone using the
standard switch-hook flash convention.
• Any of up to 48
pre-selected off-site telephone numbers, with or without
an intermediate voice messaging. Routing of incoming
calls by the System 922 to a particular off-site
telephone number can be based on predefined DNIS table
match-and-route instructions.
• A voice message,
providing the caller with prerecorded information.
Whenever the System 922 is in control of the network
circuits, on-site personnel can use the analog phones to
make outgoing calls. They access the PSTN networks by
dialing a one- or two-digit access code.
A flexible, menu-driven software configuration system
allows support personnel, using VT100 terminal
emulation, to customize the operation of their System
922. Configurable parameters are robust and include
inbound call routing, outbound call access, security,
and ACD operation. The menu system also provides a
real-time view of the unit’s operating status.
The System 922 is powered by –48 Vdc. In most
applications, either the Gordon Kapes, Inc. Model 732A
or Model 734A DC Power Supply with Battery Back-Up is
recommended. Both power supplies are CUL LISTED. As the
System 922 uses low-power circuitry, extended operating
time from the UPS can be expected. The System 922 is FCC
registered.
System 922 Specifications
General
Dimensions (Overall):
13.9 inches high (35.3 cm)
13.5 inches wide (34.3 cm)
10.2 inches deep (25.9 cm)
Mounting:
Wall Mounting: mounts to minimum ¾-inch thick plywood backboard
Rack Mounting: mounts in a 19-inch rack assembly, uses eight rack spaces
Weight:
Basic Configuration Unit: 21.5 pounds (9.8 kg)
All Cards Installed: 25.0 pounds (11.4 kg)
Shipping Weight: 33.0 pounds (15.0 kg)
Environment: 0 to 50 degrees C, humidity to 95% (no condensation)
Connectors:
2, 25-pair plugs, male (analog ports)
1, 25-pin D-subminiature connector, female (serial port)
4, 8-position non-keyed modular jacks for Network DS1 and CPE DS1
1, 3-position header (ground and DC power)
1, 8-position header (contact input/status output)
Power Requirements:
Voltage: –42.5 to –56 Vdc, filtered and regulated
Current: 1.2 amp maximum
Type: uninterruptible, even in the event of a commercial power failure
Connection: 3-position removable terminal block
Configuration Port:
Type: RS-232-C Data Communications Equipment (DCE)
Data Format: 8 data bits, no parity, 1 stop bit (8-N-1)
Data Rate: 9600 baud
Flow Control: XON/XOFF
Connector: 25-pin D-Subminiature, female
LED
Indicators: 9
Indication: +8 VDC, –8 VDC, 87 VAC Active, Contact Input 1, Contact
Input 2, CPE DS1 A Fail, CPE DS1 B Fail, Network DS1 A Status, Network
DS1 B Status
Configuration Data Storage:
Type: 128k bytes, super low power static RAM
Configuration Back-up Battery: 3 V, 150 mAh lithium battery, field
replaceable
Memory Retention with No DC Power Present: 6 years cumulative, minimum
Contact Inputs: 2
Signal Compatibility: normally open (not shorted) or normally closed
(shorted), contact closure referenced to ground
Signal Requirements: signals connected to the contact inputs must be
capable of handling 5 mA at 10 Vdc
Connections: 2 pairs on 8-position removable terminal block
DS1
Status Relay Contacts: 2, normally open (not shorted)
Rating: 0.5 A maximum at 60 Vdc or 60 Vac (resistive)
Connections: two pairs on 8-position removable terminal block
Network DS1 Connections: 2, directly connects to RJ48C using an
8-position modular data cable (cable and 8-position modular jack
included with System 922)
CPE
DS1 Connections: 2, connects to CPE DS1 equipment using
8-position modular data cable to mate with 8-position modular jack
(cable and jack included with System 922)
Network DS1 to CPE DS1 Transfer Method: metallic switching using sealed, bifurcated relay contacts
Regulatory Compliance:
Complies with Part 68, FCC Rules
FCC Registration Number: GIDUSA-18534-DE-N
Ringer Equivalence: not applicable
Required Connector: USOC RJ48C
Service Code: 6.0N
Facility Interface Code: 04DU9-B (D4 Framing), 04DU9-C (ESF Framing)
923 DS1 Interface Card
Installation: for use in System 922 enclosure only, one card
maximum
DS1
Circuit Compatibility:
Designed for direct connection to DS1 circuits without requiring
the use of an external channel service units (CSU). CSU circuitry is
contained on the 923 Card and is intended only for System 922 use. CSU
functionality is not provided to connected CPE DS1 equipment.
T1 Framing: ESF or D4 (superframe)
Zero Suppression: AMI, B8ZS, ZCS
Signaling Method: Robbed Bit, ISDN PRI
Robbed Bit Signaling Support: Ground Start FXS/FXO, SAS/SAO; Loop Start
FXS/FXO, SAS/SAO; E&M Wink, Immediate
PRI Signaling Support: National ISDN-2, including AT&T 4ESS PRI (per
TR41449, TR41459), AT&T 5ESS (5E6 and 5E7) PRI, Northern Telecom DMS100
and DMS250; 4ESS (NI-2); 5ESS (NI-2); 5ESS (NI-1); DMS100 (NI-2); DMS100
(NI-1), user side only
Layer 2 Protocol: per CCITT Q.921; LAP-D
Layer 3 Protocol: per CCITT Q.931
Transmitter:
Line Rate: 1.544 Mbps (external source)
Line Impedance: 100 ohms, resistive
Line Build Out: 0, –7.5, –15 dB, and –22 dB
Maximum Cable Drop: 6000 feet
Transmit Pulse Characteristics: meets the requirements of AT&T
Communications Document TR 62411 (December 1990), ANSI T1.403-1989
Receiver:
Line Rate: 1.544 Mbps ±200 bps
Line Impedance: 100 ohms, resistive
Sensitivity: 0 to –30 dBSX
Maximum Cable Length for Correct Performance: 6000 feet
Jitter Tolerance and Jitter Attenuation: meets the requirements of AT&T
Communications Document TR 62411 (December 1990), ANSI T1.403-1989
CPE
DS1 Carrier Loss Monitoring – DS1 A, DS1 B: circuitry watches for
the presence of frame loss including yellow alarm
CPE
DS1 Keep Alive – DS1 A, DS1 B: send framed ones, send blue alarm,
send yellow alarm, send line loopback
924 CPU
Card
Progress Tones Generated: industry-standard dial, reorder, busy,
audible ring, vacant, and howler tones
Configuration Back-up Battery: 3 V, 150 mA lithium battery, field
replaceable
Memory Retention with No DC Power Present: 6 years cumulative,
minimum
Recorder/Announcer Channels: 2, each with 20-second (maximum)
record/playback duration
Audio Recording Source: System 922 OPS telephone only
DTMF
Receivers: 8 (serves as shared resource)
T1
Robbed Bit DNIS Type: DTMF only
Analog
Cards
Depending upon the requirements of the application, up to six analog
cards can be installed in a 922 enclosure.
938A
OPS Card:
OPS Ports: 8, emulate PBX Class A FXO OPS circuits as defined in FCC
Part 68
Loop Voltage: –48 Vdc
Loop Current: 25 mA (maximum)
Maximum Loop Resistance: 1520 ohms
Ring Voltage: 87 Vac, 20 Hz, sine wave
Ringer Load: REN 2 (maximum)
Disconnect Supervision: 1.5-second break in loop current
Switch Hook Flash Timing: 350 to 950 milliseconds
Dialing Type: DTMF only
Analog Caller ID Option: FSK Caller ID
939
Analog Card:
Ports: 8, emulate FXS (subscriber) loop start circuits as defined in FCC
Part 68
Actions: answer incoming analog calls, initiate outbound analog calls
Ring Trip: 1 to 9 rings, adjustable
Ringer Load: REN 2 (maximum)
Disconnect Supervision: 1.5-second break in loop current
Dialing Type: DTMF only
Specifications
subject to change without notice.
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