Juniper CTP151 Platform, Руководство по оборудованию, Страница: 21 / 104

The software-selectable interfaces for the module are RS-232/V.24, EIA530/X.21, EIA530A, and V.35.
Software-selectable rates range from 50 bps to 12.228 Mbps.
The module also includes an external clock reference port (CLK) for an HD-26 connector.
NOTE: The external clock reference port must be used only on the module in slot 0, the left-most
slot on the front of the CTP151 chassis. For information about the CTP151 modules slot
numbering, see “CTP151 Modules Slot and Port Numbering” on page 57 .
On the CLK port, differential clock signals are output on the pins 4 and 17 of the HD-26 connector. When
an EIA-530A DCE-F serial cable (CTP150-CBL-DB25-DCE-F) is connected to the CLK port, the TT pins
24 and 11 of the DB25 connector output clock signals. If you configure a 32 kHz reference output, an
RS-422 32 kHz clock signal is generated on the pins. Even if you disable the 32 kHz reference output and
configure an external clock reference, the module expects an RS-422 clock input (of the configured
frequency) on the same pins.
RELATED DOCUMENTATION
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CTP151 Multiservice Interface Module
The Juniper Networks CTP151 Circuit to Packet platform optionally includes a Serial Multiservice Interface
module CTP150-IM-SER-MS. The module provides 4-KHz or high-quality analog audio, or interrange
instrumentation group (IRIG) signals.
The multiservice card enables an IRIG time code (IRIG-B) signal to be transported through an IP network.
The IRIG-B standard consists of a family of rate-scaled serial time codes with formats containing up to
three coded expressions or words. The IRIG-B pulse code contains one frame of 100 elements per second
for the time of the year and GPS receiver status. IRIG-B encodes day of year, hour, minute, and second
data on a 1-KHz carrier frequency, with an update rate of once per second.
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