Patton electronic 2800 Configuring T1/E1 framing, Configuring T1/E1 line-build-out T1 only

OnSite 2800 Series User Manual 5 • T1/E1 port configuration

Configuring T1/E1 framing

Four framing formats are available for selection on the T1/E1 port. Unframed can only be used if the encapsu- lation is set for hdlc. All other currently available upper layer (encapsulation) protocols do not run in unframed mode, but in one of the framed modes.

In structured mode, E1 can be configured for crc4 or non-crc4. T1 has a single framed option, esf.

The advantage of the unframed mode (obviously with hdlc encapsulation) is the utilization of the whole link speed for user data transmission, 2.048MBit/s for E1 and 1.544MBit/s for T1. However note that HDLC has its own overhead which decreases the actual data rate.

Mode: port e1t1 <slot> <port>

Step	Command	Purpose
1	[name] (prt-e1t1)[slot/port]# framing	Configures the framing of the port.
	{crc4 non-crc4 esf unframed}	E1 mode formats are: crc4, non-crc4, unframed.
		T1 mode formats are: esf, unframed.
		Default for e1: crc4
		Default for t1: esf

Configuring T1/E1 line-build-out (T1 only)

The line build out configuration is used in long haul applications to prevent cross talk in the far end device.

Mode: port e1t1 <slot> <port>

Step Command Purpose

1[name] (prt-e1t1)[slot/port]#line-build-Specifies the pulse attenuation in dB on the line inter-

out {0 -7.5 -15 -22.5} face. Default for t1: 0 dB

Configuring T1/E1 used-connector (E1 only)

The E1 WAN port provides several line interface connector types, RJ-48C and dual coaxial BNC connectors. This command specifies which one is currently in use. Though the signal is always on all available connectors, the internal impedance matching must be selected for the appropriate interface (RJ-48C = 120 Ohm; BNC = 75 Ohm).

Mode: port e1t1 <slot> <port>

Step	Command	Purpose
1	[name] (prt-e1t1)[slot/port]# used-con-	Specifies the currently used connector.
	nector {bnc rj45}	Default for e1: rj45

T1/E1 port configuration task list 61