T3 Mux Board   16

  The T3 Mux board on the PortMaster 4 divides (demultiplexes) a DS-3 signal from a T3 line into 28 individual DS-1 signals and terminates it on Quad T1 board. ComOS 4.1 and later releases support the T3 Mux board. The T3 Mux board can be inserted into any slot except slot 4, which is reserved for the manager module.

  For information about installing and configuring the T3 Mux board, refer to the PortMaster 4 Installation Guide and PortMaster 4 Configuration Guide.

  Note ¯ To activate the T3 Mux board, you must first configure Ether0 or Ether1 with an IP address.

       Displaying T3 Mux Diagnostic Information

  To display T3 Mux debug information on the console, use the following commands:

•  show mux
•  show Line0

       Summary of T3 Mux Commands

  Table 16-1 shows the T3 Mux board configuration commands.

  Table 16-1 T3 Mux Configuration Commands

 

Command Syntax
set Line0 source local|Slotnumber:Channel	- see page 16-2
set Line0 clock backplane|external|internal	- see page 15-7
set mux backplane-clock disable|enable	- see page 16-3
set mux channel-loop Channel  auto|on|off	- see page 16-4
set mux line-clock external|internal	- see page 16-5
set mux line-loop auto|on|off	- see page 16-5
show mux	- see page 16-6
show mux status	- see page 16-8

       T3 Mux Commands

  These commands are used for configuring and displaying the status of T3 Mux boards.

       set Line0 source

  This command sets the line termination for a DS-1 line on a Quad T1 board to its own physical port on the Quad T1 board or to a channel from a T3 Mux board.

  set Line0 source local|Slotnumber:Channel

Line0	line0 , line1 , line2 , or line3  on a Quad T1 line board.
local	Terminates Line0  at its own external RJ-45 synchronous port. This is the default.
Slotnumber:Channel	Maps Line0 to a DS-1 channel on a T3 Mux board and disables the RJ-45 port on the Quad T1 board.
	Slotnumber	Physical slot containing the T3 Mux board-- an integer between 0 and 9, except slot 4.
	Channel	Integer between 1 and 28 that specifies the DS-1 channel number on the T3 line.

 

Usage

  Before using this command, you must first set the view to the slot containing the Quad T1 board.

  The T3 Mux board maps a line port on a Quad T1 board to one of the 28 channels of a T3 line. Only one line port can be mapped to any one T3 channel. You need not demultiplex an entire T3 line when using a T3 Mux board.

  The provisioning for the DS-1 lines must match the provisioning of the individual T3 channels the DS-1 lines are mapped to.

  The line ports on the Quad T1 board can then be configured as ISDN PRI or full, fractional, or channelized T1. The T3 Mux board supports the M13 framing format and converts bipolar 3-zero substitution (B3ZS) line encoding to nonreturn to zero (NRZ) digital DS-3 signaling.

  Caution ¯ Each synchronous line must be mapped to a unique DS-1 channel--two synchronous lines cannot share the same DS-1 channel.

 

Example

  Command> set view 7
View changed from 4 to 7
Command 7> set line0 source 8:25
line0 source set to T3 stream 25 in slot 8

 

See Also

  set view - page 2-18
show mux - page 16-6

       set mux backplane-clock

  This command enables and disables the PortMaster 4 backplane to receive a clock signal from the T3 Mux board.

  set mux backplane-clock disable|enable

disable	Disables the T3 Mux board from providing clocking to the PortMaster 4 backplane. This is the default.
enable	Enables the T3 Mux board to provide a clock signal to the PortMaster 4 backplane, allowing the backplane to provide clocking to the other line boards on the PortMaster 4. In this configuration, the physical Quad T1 line ports are unused.  You must also use the set mux line-clock external  command to set a clock source for the T3 Mux board.

 

Usage

  Before using this command, you must first set the view to the slot containing the T3 Mux board.

 

Example

  Command> set view 8
View changed from to 8

  Command 8> set mux backplane-clock enable
T3 Mux (slot 8) Backplane Clock set to Enabled

 

See Also

  set mux line-clock - page 16-5
set Line0 clock - page 15-7
set view - page 2-18

       set mux channel-loop

  This command enables the PortMaster 4 to perform diagnostic loopback tests on a single DS-1 channel within a T3 line.

  set mux channel-loop Channel auto|on|off

Channel	Integer between 1 and 28 that specifies the channel within the T3 line to be looped.
auto	Sets the specified DS-1 line to enter or exit loopback mode if it detects a loop-up or loop-down sequence from an external source, such as the telephone company. This is the default.
on	Manually enables DS-1 loopback for the specified channel.
off	Disables DS-1 loopback for the specified T3 channel and ignores external loop-up and loop-down commands.

 

Usage

  You must first set the view to the slot containing the T3 Mux board before using this command.

 

Example

  Command> set view 0
 View changed from 4 to 0

  Command 0> set mux channel-loop 1 auto
Mux (slot 0) chan 1 loopback set to Auto

 

See Also

  set mux line-loop - page 16-5

       set mux line-clock

  This command sets the clocking source for a T3 Mux board and its T3 line.

  set mux line-clock external|internal

external	Sets the T3 Mux board to receive its 44.74Mbps clock signal from the T3 line.
internal	Sets the T3 Mux board to generate a 44.74Mbps clock signal for the T3 line.

 

Usage

  The line port on the Quad T1 can be configured to receive its clock signal from the backplane if the T3 Mux board is configured to provide clocking to the backplane.

  You must first set the view to the slot containing the T3 Mux board before using this command.

 

Example

  Command> set view 8
View changed from 4 to 8

Command 8> set mux0 line-clock external
T3 Mux (slot 8) Line Clock set to External

 

See Also

  set mux backplane-clock - page 16-3

       set mux line-loop

  This command enables the PortMaster 4 to perform diagnostic loopback tests on an entire T3 line.

  set mux line-loop auto|on|off

auto	Sets the entire T3 line to enter or exit loopback mode if it detects a loop-up or loop-down sequence from an external source such as the telephone company.
on	Enables loopback for the entire T3 line.
off	Disables T3 line loopback and ignores external loop-up and loop-down commands.

 

Usage

  Before using this command, you must first set the view to the slot containing the T3 Mux board.

 

Example

  Command> set view 0
View changed from 4 to 0

Command 0> set mux line-loop on
Mux (slot 0) Line Loop set to On

 

See Also

  set mux channel-loop - page 16-4

 

       show mux

  This command displays the status of a T3 Mux board.

  show mux

 

Example

Command 8> show mux
MUX Line Status: Up		Line Clock: External		Backplane clock: Enabled
Mux Channel	Slot	Line	Line Status	Line Type	Line Sync Loss	X-Connect
-------	-----	-----	-------	----------	----------	----------
1	7	0	Up	Inband	0	OK
2	7	1	Up	Inband	0	OK
3	7	2	Up	Inband	0	OK
4	7	3	Up	Inband	0	OK
5	1	0	Up	Inband	0	OK
6	1	1	Up	Inband	0	OK
7	1	2	Up	Inband	0	OK
8	1	3	Up	Inband	0	OK
9	2	0	Up	Inband	0	OK
10	2	1	Up	Inband	0	OK
11	2	2	Up	Inband	0	OK
12	2	3	Up	Inband	0	OK
13	3	0	Up	Inband	0	OK
14	3	1	Up	Inband	0	OK
15	3	2	Up	Inband	0	OK
16	3	3	Up	Inband	0	OK
17	5	0	Up	Inband	0	OK
18	5	1	Up	Inband	0	OK
19	5	2	Up	Inband	0	OK
20	5	3	Up	Inband	0	OK
21	6	0	Up	Inband	0	OK
22	6	1	Up	Inband	0	OK
23	6	2	Up	Inband	0	OK
24	6	3	Up	Inband	0	OK
25	0	0	Up	ISDN	0	OK
26	0	1	Up	ISDN	0	OK
27	0	2	Up	ISDN	0	OK
28	0	3	Up	ISDN	0	OK

 

Explanation

MUX Line Status	Displays the status of the T3 Mux board.
Line Clock	Source of clocking.
Backplane clock	Displays the source of backplane clocking:
	Enabled	T3 Mux board is providing the clocking to the backplane.
	Disabled	T3 Mux board does not provide clocking to the backplane.
Mux Channel	Integer between 1 and 28 that corresponds to a digital signaling channel on the T3 line.
Slot	Integer between 0 and 9 that identifies a physical slot occupied by a Quad T1 board on the PortMaster 4. Seven Quad T1 boards are required to fully terminate a T3 Mux card.
Line	Line 0, line 1, line 2, or line 3 on a Quad T1 board that terminates a T3 channel.
Line Status	Status of a T1 line:
	Up	T1 line is active.
	Down	T1 line is inactive.
	Carrier	T3 Mux board detects a signal for the channel, but the Quad T1 board might be inactive or removed from its slot.
	No Signal	T3 Mux board detects no signal from the DS-1 channel.
	Alarm	T3 Mux board detects an alarm condition for the channel.
Line Type	Type of service that the T1 line is set to:
	Inband	Line is configured as channelized T1--robbed bit signaling.
	ISDN	Line is configured as ISDN PRI.
Line Sync Loss	Number of times synchronous timing was lost for the channel specified.
X-Connect	Displays the connection status between the T3 Mux board and the T1 line.
	Ok	Backplane connection is made between the T3 Mux board and the T1 line, and a channel is assigned to the line.
	Connected	Backplane connection is made between the T3 Mux board and the T1 line, but no channel has been assigned to the line.
Connecting		Backplane connection between the T3 Mux board and the T1 line is in progress.
T3 Not Ready		T3 Mux board is inactive.
T1 Not Ready		Quad T1 board is inactive.
	n/a	Quad T1 is not in its slot.

       show mux status

  This command displays information about DS-3 line on a T3 Mux board.

  show mux status

 

Example

Command 8> show mux status
-------------------- Statistics for Mux0 in slot0 ---------------------
Rx Loss of Signal:	0	Rx Out of Frame:	0
Rx AIS alarm:	0	Rx IDLE Pattern:	0
Rx Clock Failure:	0	Tx Clock Failure:	0
F&M Bit Errors:	0	M Bit Errors:	0
Parity Errors:	0

 

Explanation

Rx Loss of Signal	Occurs when incoming DS-3 data is stuck low for more than 1022 clock cycles. Recovery occurs when two or more ones are detected in the incoming data bit stream.
Rx AIS alarm	Ensures that the T3 Mux board is detecting DS-3 framing.
Rx Clock Failure	Receive DS-3 clock failure alarm--occurs when the receive clock is stuck high or low for from 30 to 100 DS-3 clock periods. Recovery occurs on the first clock transition.
F&M Bit Errors	8-bit saturation counter--number of DS-3 F-bits and DS-3 M-bits that are in error since the last read cycle. This counter is inhibited when a DS-3 loss-of-signal or out-of-frame error occurs.
Parity Errors	Number of P-bit parity errors received since the last cycle. This counter is inhibited when a DS-3 loss-of-signal or out-of-frame error occurs.
Rx Out of Frame	Occurs when 3 out of 16 F-bits are in error--in a sliding window of 16 bits--or when one or more M-bits are in error in two consecutive frames. Recovery occurs when the F-framing pattern of 1001  is detected and the M-framing pattern of 010  is detected for two consecutive frames. Recovery takes approximately 0.95 milliseconds.
Rx IDLE Pattern	Occurs when six or more 4-bit groups of the pattern 1 -1 -0 -0  per DS-3 frame contain errors.
Tx Clock Failure	Occurs when the transmit input clock is stuck high or low for from 30 to 100 DS-3 clock periods. Recovery occurs when the first clock transition is detected.
M Bit Errors	Number of M-bits that are in error since the last read cycle. The counter is inhibited when a DS-3 loss-of-signal or out-of-frame error occurs.