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PRI port configuration task list 194
SmartWare Software Configuration Guide 16 • PRI port configuration
Mode: port <hw-type> <slot> <port>
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-crc4 and 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]# linecode
{ami | b8zs | hdb3}
Configures the line-code of the port.
Default for e1: hdb3
Default for t1: b8zs
Step Command Purpose
1 [name] (prt-e1t1)[slot/port]# framing
{crc4 | non-crc4 | esf | sf | unframed}
Configures the framing of the port.
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