Encore 24 PORTS NWAY SWITCHING HUB User's Guide Page 65

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ConÞguration 3-17
3
¥ DATA [n] Select a data port if the DTE device is the clock source.
Use the appropriate V.35 or RS-449 DTE cable to conÞgure the DSU/CSU as a DTE
device. (See Connecting to the DTE Devices on page 2-10.)
When neither the Main nor Alternate clock source is available, the DSU/CSU uses
INTERNAL.
To set the clock source to an external source, select EXT, connect the external clock
mechanism to the BNC connector, labeled EXT CLOCK., and set the clock rate from
the front panel interface. The recommended external clock source is a square wave
of 50% duty cycle, TTL level (i.e. 0 to 2.4Vmin). The correct voltage range is 2.4 VDC
minimum peak to peak and 5.0 VDC maximum peak to peak.
During Loop Up/Loop Down Remote (full bandwidth), Smart Jack Set, Smart Jack
Reset and all full bandwidth pattern tests, the DSU/CSU cannot use NETWORK
timing. When performing the tests, the remote DSU/CSU is typically in network
loopback and the local DSU/CSU should not be using NETWORK timing since the
received network signal is the signal it generated. In such a case, the NETWORK
1. Applies only to DSU/CSUs running the old Þrmware version and containing NET Interface in Menu-4.
ANSI FDL
Protocol
(ESF only)
Enabled or
Disabled
DefaultÑEnabled. EnabledÑEnables the ANSI T1.403
FDL protocol. DisabledÑDisables the protocol.
FDL (ESF only) Block or Through DefaultÑBlock. ThroughÑEnables FDL transmission
(in both directions) only between the network and the
CSU or AUX port. During a transmission to the
network port, the FDL link between the AUX or CSU
port is broken. BlockÑDisables the above function.
When the DSU/CSU has no trafÞc to send over the
network FDL channel, it displays the HDLC IDLE
ßag. FDL appears on the screen only when the local
and remote
DSU/CSUs are in ESF and the remote
DSU/CSU has an AUX port.
Table 3-4 NET (Continued)
Parameter Setting Description
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