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| What kind of card do you put ADM trunks on?
Welcome to the board. From MERL: Quote: Add-on Data Module
The ADM is packaged in a molded chameleon gray plastic case 6.25 in
(159 mm) wide. It has the same profile as the basic SL-1 telephone set and is
equipped with a black faceplate.
The ADM is a microprocessor-controlled module which provides advanced
data transmission features over a wide range of data rates. It eliminates
unnecessary analog conversions between data terminal equipment and the
Meridian 1 switching network by using digital transmission over existing
2-pair SL-1 set wire.
The ADM replaces base-band modems, acoustical couplers, and limited
distance data sets for in-house data transmission activities. It extends several
SL-1 station calling features to data calling use when installed on a standard
SL-1 telephone. The ADM also provides switched, dial-up access from
multiple in-house terminal equipment to shared dedicated or voice-grade
modems for external data calling. | Quote: QMT7 ADM
The QMT7 provides asynchronous, half or full-duplex operation over 2- or
4-wire transmission lines and, depending on the terminal or modem used,
transmission speeds of 50, 75, 110, 134.5, 150, 300, 600, 1200, 1800, 2000,
2400, 3600, 4800, 7200 and 9600 bps. It accommodates a serial character data
format of 5, 6, 7 or 8 data bits and 1, 1.5 or 2 stop bits (or as defined by the
data unit).
The ADM is compatible with Bell 103/212/202 compliant modems and
provides an EIA RS-232-C interface to data terminal equipment or modems.
It converts the signals from the data equipment to full-duplex digital
(128 kbits/sec, BPRZ encoded) to send to the Data Line Card (DLC) in the
Meridian 1.
The ADM provides for re-down-line loading of RS-232 control signals. It
also provides the following Data Call features:
— Flexible numbering plan for data stations
— Auto-answer capability
— Originate capability
— Voice path integrity in ADM power loss situations
— Alternate or simultaneous voice and data calling per data station
— Distinctive buzz for incoming data calls
— Distinctive connect tone
— Power Fail Protection
Note: Not all of the data modules have these features, i.e., not all have
distinctive buzz, alternate or simultaneous voice and data capability. See
module specifications.
The in-house error rate should be no greater than 1 error x 10 -7 bits and the
error rate over trunks should be no greater than 1 error x 10 -5 bits (modem
dependent). | Quote: QMT8 SADM
The QMT8 has the same profile as the QMT7, but it supports both
asynchronous and synchronous data transmission. A service switch is used to
change from one mode of transmission to the other. The QMT8 can operate
in the same configuration as the QMT7.
The QMT8, when operating in the asynchronous mode, can operate at
19200 bps in addition to speeds specified for the QMT7. The QMT8 also
supports the inbound modem pooling and keyboard dialing features.
When operating in the synchronous mode, the QMT8 can transmit data at
1200, 2400, 3600, 4800, 7200, 9600, 14400, 19200, 38400, 40800, 48000, or
56000 bps. Some of the QMT8 controls are different and are defined in
Table 2.
Note: For QMT8 with RS-232 interface at speeds above 20 kbps, the
EIA cable lengths (DTE or DCE to ADM) are speed-dependent and must
be shorter than 50 ft (15 m); e.g., in the 5 to 8 ft (1.5 to 2.5 m) range at
56 kbps.
QMT12 ADM
The QMT12 (V.35) ADM has the same profile as the QMT7 and QMT8.
However. the QMT12 provides high-speed V.35 CCITT synchronous instead
of a RS-232 interface to data terminals or modems. The QMT12 interface
conforms electrically to the CCITT V.35 standard and mechanically to
ISO-2110. The QMT12 provides for the same data transmission speeds as the
QMT8 synchronous ADM; 1200, 2400, 3600, 4800, 7200, 9600, 14400,
19200, 38400, 40800, 48000, or 56000 bps. The controls and option selectors
are similar to the QMT8 and are described in Tables 1 and 2.
Note: The RS-232-C (QMT DCE/DTE interface is normally used for
low-speed data rates (up to 19.2 kbps) while the V.35 (QMT12) interface
is used when high-speed (38.4 to 56.0 kbps) data rates are required.
However, synchronous terminals operate with whatever clock they
receive. Therefore, a user with a V.35 terminal can set the speed switch
to a low speed and call an RS-232 modem. A different color is used on
the speed indicator card of the QMT12 to indicate the higher speeds.
The V.35 CCITT interface should only be used in the synchronous operating
mode. | Quote: Data Line Card
The DLC is located in a Peripheral Equipment (PE) shelf. It encodes
information streams received from the ADM and routes this information
through the Meridian 1 switching network to the called data facility
(computer or terminal).
The QPC311 DLC supports two SL-1 telephones and two ADMs, either in
independent or paired operation. The DLC data ports can support two
MCDS-AC ports, two CIC ports, two ASIMs or two CIMs. Microprocessor
control allows the DLC to separate incoming voice signals, data signals, and
actual data, and route this information through the switching network.
The DLC contains an option switch used to link or isolate operation of each
SL-1/ADM circuit pair as required and jumper positions for wire gauge
selection.
4-Port Data Line Card
The 4PDLC is located in a Peripheral Equipment (PE) shelf. It meets the
physical and electrical specifications of any DLC to data-module interface
and provides access to network channels for data information. The 4PDLC is
used in applications that require a large concentration of data ports.
It provides four SL-1 data only ports and is primarily designed to serve
MCDS-AC, ASIM, CIM, CIC, and stand-alone ADM.
The 4PDLC does not support calls that involve voice ports such as in
outbound modem pool calls. The 4PDLC accepts both voice and data call
signals but does not distinguish between them and therefore cannot be used
in cases where both types of signals are present.
The 4PDLC has one LED indicator on the faceplate that is lit when the card
is disabled. | |
06-04-2004, 12:07 PM 
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