3. Connect the modem RJ-11 jack to the enclosure RJ-11 jack with the RJ-11 patch cord
(
(p. 37)).
4. Connect the modem ground terminal block (GND) to the enclosure ground by using the 14
AWG ground wire.
6.7.2.2 External installation of phone modem
The following modem kit components are used to make the external connections:
(1) Direct Burial Splice Kit
(1) 6 m (20 ft) Telephone Patch Cord with Connector
1. Connect the 6 m (20 ft) patch cord to the COM connector on the external back panel,
under the protective cover. Ensure that the plug is completely seated.
2. Splice the Tip and Ring lines of the patch cord to the telephone service line. Use the direct
burial splice kit when splices are in a valve box or buried.
NOTE:
The splice and wire nut must be completely immersed into the silicone gel inside the splice
tube to be waterproof.
6.7.3 Short-haul modem
Short-haul modems enable communication between a data logger and computer over two
twisted pairs of wires. The maximum distance between modems is determined by baud rate and
wire gage. At 9600 bps, the approximate maximum cable length is 10 km (6 miles) using 19 AWG
cable. DCE / DTE switches on the modems are set to DCE.
CAUTION:
It's critical to use at least a two twisted-pair cable with a shield wire. Shield wire(s) and/or any
additional unused conductors must connect to an earth ground at one end or the other of
the cable run.
6.7.3.1 Internal installation of short haul modem
NOTE:
If the short haul modem was ordered with the T107, skip this section and go directly to
External installation of short haul modem
For installing inside the T107 enclosure, the following components are provided in the short-haul
modem kit:
(1) SC932C 9-pin to RS-232 DCE interface
Section 6. Installation
38
