Patton electronic SmartNode 4110 Series Configuring PRI framing, Name prt-e1t1 slot/port# linecode

SmartWare Software Configuration Guide16 • PRI port configuration

Mode: port <hw-type> <slot> <port>

Step	Command	Purpose
1	[name] (prt-e1t1)[slot/port]# linecode	Configures the line-code of the port.
	{ami b8zs hdb3}	Default for e1: hdb3
		Default for t1: b8zs

Configuring PRI framing

Four framing formats are available for selection on the E1T1 port. Unframed can only be used if the encapsula- tion 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-crc4and T1 has the framing option esf and sf.

•CRC4 (E1): Cyclic Redundancy Check 4. A CRC4 Multi-Frame consists of 16 continuous Basic-Frames. Each Multi-Frame can be divided into two Sub Multi-Frames. The first bit of Timeslot 0 of each even Sub Multi-Frame is called the C-Bit and belongs to the CRC4 check sum.

•ESF (T1): Extended Super Frame. The ESF if made up of 24 Basic-Frames. Each Basic-Frame includes one overhead bit, the F-Bit. The 24 F-Bits of one Extended Super Frame are used for synchronization (6 Bit), transmitting data link information (12 Bit) and for CRC6 calculation (6 Bit).

•SF (T1): Super Frame: The SF is made up of 12 Basic-Frames. Each Basic-Frame includes one overhead bit, the F-Bit. The 12 F-Bits of one Super-Frame represent the frame alignment pattern that is used for synchro- nization.

•Unframed: 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 sf unframed}	Restriction: Only available for e1t1 ports
		E1 mode formats are: crc4, non-crc4, unframed.
		T1 mode formats are: esf, sf, unframed.
		Default for e1: crc4
		Default for t1: esf

PRI port configuration task list 194