3Com 3C13701, Руководство по установке

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30 C
HAPTER
2: I
NTRODUCING
R
OUTER
5012 SIC
S
5 Check the status of the synchronous (LINK) LED on the faceplate of the 1-Port
Fractional T1 SIC. If the LED is off, the line is faulty. Check the line.
1 Port Analog Modem
SIC
SIC-1AM integrates the functions of asynchronous interface and external Modem,
i.e. allowing 1 channel of remote Modem customers to directly access the Router.
Its main functions are:
■
Supporting the bit rate of 56kbps.
■
Detecting rings, off-hook, protect, and 2/4 wire convert and so on.
■
Accessing and processing the analog signals and transmitting the processed
data to the Router host through the serial interface bus. And also, processing
the data received from the host and then transmitting them to the PSTN via the
telephone port.
Figure 31 1 Port Analog Modem SIC
Figure 32 1 Port Analog Modem Panel
Table 25 1Port Modem Attributes
Attribute Description
Connector type RJ11
Number of connectors 1 (SIC-1AM)
2 (SIC-2AM) Cable type
Telephone cable with ferrite core. Maximum speed
56kbps Supported standard
ITU-T V.90, V.34 (33.6 kbps), V.FC, V.32 bis, V.32,
V.22 bis, V.22A/B, V.23, V.21, Bell 212A a, Bell 103. Supported service
Modem dial-up