Network Control Module 300 Series Technical Bulletin 43
S2 Migration: Table Top Modem
The TTM-10n TableTop Modem provides an interface between the
RS-232 Port 2 on the S2 Migration NCM and one JC/85
communications trunk. A TTM-10n modem consists of an external
power supply, a circuit board with enclosure, and one master modem
card. Three models of the TTM-10n are available:
• TTM-101: Provides the interface necessary to communicate to an
18 AWG proprietary, shielded, twisted-pair trunk. A TRM-101
comes mounted to the printed circuit card and is available for
single trunk applications only.
• TTM-102: Provides the interface necessary to communicate to a
dedicated leased type 3002 phone line. A DPM-101 comes
mounted to the printed circuit card.
• TTM-103: Provides the interface necessary to communicate on a
JC/LINK Generic Bridge. The Rolm® bridge version is not
available.
S2 Migration: S2 Cabling
The JC/85 trunk cable attaches to the TableTop Modem via the
connector (included with TTM), shown with its pinouts.
S
LH
TRUNK POWER
RS-232
Shield: TTM101
N.U.: TTM102/103
L1H: TTM101
Ring: TTM102/103
L1L: TTM101; TIP: TTM102/103
200tc20
Figure 19: Table Top Modem to JC/85 Trunk
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