T1 interface, T1 interface connection, Switch s3-3: transmit clock mode – Patton electronic G.SHDSL INTEGRATED 3086 User Manual
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4 • Basic Application Configurations
Model 3086 G.SHDSL Integrated Access Device User Guide
44
T1 Interface
installed at a Central Office should be set to CO. For point-to-point operation, one unit must be CO while the
other must be CP.
Switch S3-3: Transmit Clock Mode. Use Switches S3-3 to configure the Model 3086 for internal or external
clock mode (keep in mind that this setting only affects the operation of the serial port).
T1 Interface
The 3086 enables T1 or E1 device located at customer locations to access a carrier’s network over two wire,
long reach DSL links. This capability allows providers to offer T1/E1 services at customer locations that were
previously outside the reach of standard T1/E1 lines.
The 3086/K offers a user configurable T1 or E1 interface. Selection of the interface is done via DIP switches,
HTTP/SNMP, or command line interface (CLI).
The T1 interface is an eight position keyed modular jack configured as a RJ-48C for connection to 100-ohm
twisted pair lines.
Figure 10. 3086 T1 port pinout
T1 Interface Connection
The 3086 will usually connect either to a local T1 device, or to a Telco terminated T1 line jack.
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To connect the 3086’s T1 port to a local T1 device ( PBX, router, mux) use a T1 ‘crossover’ twisted pair
cable. A crossover cable connects the transmit pins of the Model 3086’s T1 port to the receive pins of the
device attached to this port and vice versa. Check the third party T1 equipment documentation for pinout
information and cable requirements.
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To connect the 3086’s T1 port to a Telco terminated T1 line jack, use a straight through twisted pair patch
cable. Consult with your T1 service provider for exact pinout information and cable requirements.
S3-3
Setting
Off
CP
ON
CO
S3-3
Clock mode
Off
Internal. Transmit Clock to DTE is generated internally by the Model 3086
On
External. Transmist Clock to DTE is generated from external clock signal received
from DTE. (This option is only available when the Model 3086 is set to CO mode.