|
FEATURES
- SRM-5A and SRM-5D are Miniature Asynchronous Short
Range Modems for local data distribution, connecting full duplex
asynchronous DTEs to computers.
- SRM-5A and SRM-5D operate at distances up to 12 km
(7.5 miles) and 27.5 km (17 miles), respectively, depending on the wire
gauge and data rate
(see Table 1). Both modems ensure integrity of data transmission, using
unconditioned 4-wire dedicated lines at data rates up to 19.2 kbps. An
internal filter overcomes both radiated and conducted noise, and provides
surge protection.
- Innovative circuitry allows the modems to operate
without connection to the mains supply, by using ultra low power from the
V.24/RS-232 data and control signals. The modems will operate even if only
Transmit Data is connected, i.e. without any control signals. Both
positive and negative signals are generated, irrespective of constantly
high or constantly low Transmit Data.
- The low transmit level minimizes crosstalk onto
adjacent circuits within the same cable. Data is transmitted and received
at a balanced interface, ensuring high immunity to circuit noise.
- SRM-5A and 5D feature a switch-selectable DCE/DTE
option. This allows the modems to operate as DTE for connection to a DCE
(such as a multiplexer port) without the need for a cross cable.
- The SRM-5A model is coupled to the dedicated line
via isolation transformers rated at over 1,500 VRMS. The transformers,
together with other circuitry, protect against AC or DC overvoltages. This
makes SRM-5A suitable for connection to local circuits provided by most
national telephone administrations (P.T.T.s).
- Two connectors are provided for the line interface:
a five-screw terminal block, and either an RJ-45 or RJ-12 connector
(see Ordering).
SPECIFICATIONS
- Asynchronous transmission rate up to 19.2 kbps
- Transmission range:
SRM-5A: up to 12 km (7.5 miles)
SRM-5D: up to 27.5 km (17 miles)
- No AC power required
- Transformer isolated (SRM-5A only)
- V.24/RS-232-C interface
- Compact, lightweight, easy to install
SRM-5A/*/+/NEW
Async Short Range Modem, transformer isolated
SRM-5D/*/+/NEW
Async Short Range Modem
| * |
Specify:
F for female 25-pin connector
M for male 25-pin connector |
| + |
Specify line interface:
RJ-12 for RJ-12 and terminal block connectors
RJ-45 for RJ-45 and terminal block connectors
(Default is RJ-45 and terminal block connectors) |
|
ORDERING
SRM5A/F/RJ11/NEW
SRM5A/F/RJ45/NEW
SRM5A/M/RJ11/NEW
SRM5A/M/RJ45/NEW
SRM5AC/F/RJ11
SRM5AC/F/RJ45
SRM5AC/F/RJ45/SI
SRM5AC/M/RJ11
SRM5AC/M/RJ45
SRM5AC/M/RJ45/SI
SRM5D/F/RJ11/NEW
SRM5D/F/RJ45/NEW
SRM5D/M/RJ11/NEW
SRM5D/M/RJ45/NEW
APPLICATIONS
|
