Juniper Networks ERX Hardware 8 - Manual (Page 32)

ERX 8.0.x Hardware Guide
RS-232—The port provides a serial connection for monitoring the system’s
hardware configuration through a PC (running terminal emulation software) or
ASCII terminal. Allows direct CLI access.
Alarm contacts—The contacts provide for remote indication of critical, major,
and minor router alarms (ERX-7xx and ERX-14xx models only; currently
not implemented)
External timing inputs—The inputs provide a method of ensuring that the
clock timing used by the router remains synchronized with the network’s
system clock. BNC connectors and wire wraps are available for ERX-7xx
and ERX-14xx models only.
For details about installing the SRP I/O module, see “Installing Modules” on page 35.
Line Modules
Line modules (LM) process data from different types of network connections.
For information about available line modules and which SRP modules support
specific line modules, see the ERX Module Guide.
Figure 11 shows a representative line module. For details about installing
line modules, see “Installing Modules” on page 35.
14 ERX Modules