Type V uses two leads, the E and M leads, for signaling. During inactivity, both the E and
M leads are open. The CTP device signals off-hook by connecting the E lead to ground.
The trunk circuit signals off-hook by connecting the M lead to ground. As with type I, with
type V signaling, the two units share a common ground. Type V signaling allows for
signaling units to be connected back-to-back.
Table 5: Supported Signaling Types for the CTP2000 4WE&M Module
CTP (E Lead)PBX (M Lead)
Signaling
Leads
Signaling
Type
Off-hookOn-hookOff-hookOn-hook
GroundOpenBatteryGroundE, MI
SGOpenSBOpenE, M, SG, SBII
GroundOpenGroundOpenE, MV
Related
Documentation
CTP2000 Serial Interface Modules on page 11•
• CTP2000 T1/E1 Interface Module on page 12
• CTP2000 Compression Interface Module on page 12
• CTP2000 Compression 2 High Density Interface Module on page 13
• CTP2000 2W-FXS and 2W-FXO Interface Modules on page 19
• CTP2000 8P-IRIG Interface Module on page 25
CTP2000 2W-FXS and 2W-FXO Interface Modules
The CTP2000 2W-FXS and CTP2000 2W-FXO interface modules provide analog support
for voice applications. The 2W-FXS module has 24 two-wire FXS ports and the 2W-FXO
interface module has 12 two-wire FXS ports. Both are paired with an RTM.
•
FXS interfaces point to the subscriber and supply battery and ring voltage. Some FXS
devices also provide dial tone, but CTP FXS interfaces do not. FXS interfaces detect
when the attached FXO interface goes off-hook and on-hook. An FXS interface is a
two-wire interface; the leads are called the tip (T) and the ring (R).
•
FXO interfaces point to the central office. An analog phone is an example of an FXO
device. The FXO interface must detect ring voltage (the analog phone rings) and provide
on- and off-hook indication to the FXS interface. An FXO interface is a two-wire
interface; the leads are called the tip (T) and the ring (R).
Both interface modules consist of a front module and an RTM. See Figure 19 on page 20
and Figure 20 on page 20 for the CTP2000 2W-FXS interface module.
19Copyright © 2017, Juniper Networks, Inc.
Chapter 2: CTP2000 Series Interface Modules
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