Cabletron Systems SSIM-A8-01 Spezifikationen PDF herunterladen (Seite 36)

DS1 Views

DS1 Application

3-4

Miscellaneous Applications

Line Coding This ﬁeld displays the type of Zero Code Suppression used on the link, which

in turn affects a number of its characteristics. Possible Zero Coding options

are:

JBZS - Refers to the Jammed Bit Zero Encoding, in which the AT&T

speciﬁcation of at least one bit every 8 periods is literally implemented by

forcing a pulse in bit 8 of each channel.

B8ZS - Refers to the use of a speciﬁed pattern of normal bits and bipolar

violations, which are used to replace a sequence of 8 zero bits.

HDB3 - Used by G.704 links with or without CRC.

ZBTSI - Zero Byte Time Slot Interchange. Used by ANSI to clear channels.

AMI - Refers to a mode wherein no zero code suppression is present and

line encoding does not solve the problem directly. In this application, the

higher layer must provide data which meets or exceeds the pulse density

requirements, such as inverting HDLC data.

Other - A line coding other than those listed above.

DS1 Identiﬁer This ﬁeld identiﬁes the channel.

Transmit Clock This ﬁeld displays the source of the Transmit Clock. Possible Transmit Clock

sources are:

Loop - Indicates that the recovered receive clock is used as the transmit

clock.

Local - Indicates that the local clock source is used.

Through - Indicates that the recovered receive clock from another interface

is used as the transmit clock.

Loopback Conﬁg This ﬁeld displays the loopback conﬁguration of the DS1 interface. The

values mean:

NoLoop - Not in the loopback state.

PayloadLoop - The received signal at this interface is looped through the

device. Typically the received signal is looped back for retransmission after it

has passed through the device’s framing function.

LineLoop - The received signal at this interface does not go through the

device (minimum penetration) but is looped back out.

OtherLoop - Loopbacks that are not deﬁned here.

DS1 Conﬁguration View (Continued)

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Cabletron Systems SSIM-A8-01 Spezifikationen Seite 36