Cabletron Systems MCC-DFL Quick Reference

The Complete Networking Soluti

on

MCC-DFL QUICK REFERENCE

QR.1 SETTING SWITCHES AND JUMPERS

SW1

1234

OFF

OFF

1234

ON

ON

SW1

1234

P1

P2

1234

SW2

P1

P2

SW2

(From back of card)

SW1 (FOT-A or RI)

Switch Configuration Table

SW2 (FOT-B or RO)

Notes: SW1 switchblock manages FOT-A.
SW2 switchblock manages FOT-B.
Individual switches on each

On – Cabletron fiber key

1

Off – 802.5J fiber key

switchblock have the same
functionality.

On – RO or lobe (RJ45 port)

2

Off – RI or station (RJ45 port)
Jumper P1 controls ring speed of
FOT-A.
Jumper P2 controls ring speed of

On – Autowrap enable (RJ45 port)

3

Off – Autowrap disable (RJ45 port)
FOT-B.

On – Station and lobe application

4

Off – RI and RO application

Location of SW1/SW2 Switchblocks And Jumpers P1/P2

(Default Settings)



Copyright 1997 by Cabletron Systems, Inc., P.O. Box 5005, Rochester, NH 03866-5005
All Rights Reserved
Printed in the United States of America
Order Number: 9032131-01 July, 1997

QR-1

QR.1.1 Selecting Port Configurations

Configuration Switch Settings Example

RJ45 port as a lobe
Fiber ST port as a station
(Default configuration)

RJ45 port as a station
Fiber ST port as a lobe

RJ45 port as a RI
Fiber ST port as a RO

RJ45 port as a RO
Fiber ST port as a RI

Station

1 – Off
2 – On
3 – Off
4 – On

1 – Off
2 – Off
3 – Off
4 – On

1 – On or Off
2 – Off
3 – On or Off
4 – Off

1 – On or Off
2 – On
3 – On or Off
4 – Off

MCC-DFL

A

B

C

D

Phantom Current

Phantom Current

P1

PWR

P2

16 Mb

P
1

F
O

TX

T
A

P
2

RX

P1

PWR

P2

16 Mb

TX

P
1

F
O

RX
T
B

P
2

Example A

Concentrator

Fiber Key

Fiber Key

QR-2

MMAC

Phantom Current

Concentrator

Phantom Current

Example B

MCC-DFL

PWR

16 Mb

P
1

F
O
T
A

P
2

PWR

16 Mb

P
1

F
O
T
B

P
2

P1
P2

TX

Fiber Key

RX

P1
P2

TX

Station

Fiber Key

RX

MMAC

Ring Out To Ring In

Ring Out To Ring In

MCC-DFL

P1

PWR

P2

16 Mb

P
1

F
O

TX

T
A

P
2

PWR

16 Mb

P
1

F
O
T
B

P
2

Ring Out To Ring In

RX

P1
P2

TX

Ring Out To Ring In

RX

Example C

MMAC

QR-3

MMAC

Ring Out To Ring In

Ring Out To Ring In

MCC-DFL

P1

PWR

P2

16 Mb

P
1

F
O
T
A

P
2

PWR

16 Mb

P
1

F
O
T
B

P
2

Ring Out To Ring In

TX

RX

P1

P2

TX

RX

Ring Out To Ring In

Example D

MMAC

QR.1.2 Selecting The Ring Speed(s)

The jumpers P1 and P2 are used to select the MCC-DFL’s ring(s) speed.
Use jumper P1 to set the ring speed of FOT-A, as shown in the table.

Ring Speed of FOT-A Put Jumper P1 Sleeve Over

16 Mbps Pins 1 and 2 (Default setting)
4 Mbps Pins 2 and 3

Use jumper P 2 to set the ring speed of FOT-B, as shown in the table.

Ring Speed of FOT-B Put Jumper P2 Sleeve Over

16 Mbps Pins 1 and 2 (Default setting)
4 Mbps Pins 2 and 3

QR-4

QR.1.3 Description Of Switches

Switch 1

You can set the type of fiber keying on RI/RO ports to connect to devices
using 802.5J fiber keying or devices using Cabletron fiber keying.
Switch 1 dictates the type of fiber keying; the setting depends on whether
the attached device is using Cabletron fiber ke ying or 802.5J fiber ke ying.
Set the switch as shown in the table.

Cabletron Systems offers complete compatibility with vendor

NOTE

Keying Type for Fiber RI/RO ST Port * Set Switch 1 to Position

Connection to Cabletron compliant devices On

products that comply with the “new” 802.5J standard for fiber
RI/RO ports. Therefore, the MCC-DFL offers connectivity to
products using 802.5J or Cabletron Systems fiber keying.

Connection to 802.5J compliant devices Off
*Applicable to RI/RO applications only – 802.5J fiber keying is always

used for station and lobe applications.

Switch 2

This switch works in conjunction with Switch 4 to select the mode of
operation for the RJ45 port. Use Switch 4 to dictate whether the FOT will
act as a RI/RO device or station/lobe device. Once this has been done
Switch 2 determines the application of the RJ45 port. The fiber ST port
automatically configures to work with the RJ45 port. For example,
configuring the RJ45 port as a RI, automatically changes the fiber ST port
to a RO. Set Switch 2 as shown in the table.

Mode of Operation for RJ-45 Port Set Switch 2 to Position

RO or lobe applications On
RI or station applications Off

QR-5

Switch 3

When the FOT is being used as a RI/RO device this switch enables or
disables the autowrap feature on the RJ45 port. It has no relevance to
station/lobe applications. The feature should be enabled to connect to
Cabletron devices or disabled to connect to non-Cabletron devices.
Set Switch 3 as shown in the table.

Autowrap on RJ45 RI/RO Port Set Switch 3 to Position

Connection to Cabletron devices On
Connection to non-Cabletron devices Off

Switch 4

This switch selects the mode on the entire FOT. Use the switch to
configure it as a RI/RO de vice or a station/lobe device. Then use Switch 2
to establish the configuration of the RJ45 port; the fiber ST port
configures automatically. Set Switch 4 as shown in the table.

Configure FOT Mode for Set Switch 4 to Position

RI/RO applications Off
Station/Lobe applications On

QR-6

QR.2 LED FUNCTIONS

Consult the diagram to help interpret LED indications.

MCC-DFL

P1

PWR

P2

16 Mb

P
1

F
O

TX

T
A

P
2

RX

P1

PWR

P2

16 Mb

TX

P
1

F
O

RX
T

B

P
2

PWR

PWR

16 Mb

P1
P216 Mb

P1
P2

MCC-DFL LEDs

PWR - Power

The

PWR

LED lights GREEN during normal operation, indicating the
reception of power. If the LED is off, the MCC-DFL is not receiving
power.

16 Mb - Ring Speed

Each FOT has a

16 Mb

LED. The LEDs lights YELLOW to indicate a
16 Mbps ring speed on the associated FOT. An unlit LED indicates a ring
speed of 4 Mbps on the associated FOT.

P1 And P2 - Ports

Each FOT has P1 and P2 LEDs to indicate the status of the associated
port.

On FOT-A, the P1 LED indicates the status of the RJ45 port and the

P2

LED indicates the status of the fiber ST port.

QR-7

On FOT-B, the P1 LED indicates the status of the fiber ST port and the P2
LED indicates the status of the RJ45 port.

The P1 and P2 LEDs act differently on FOTs configured for

NOTE

station/lobe applications than they do for FOTs configured for
RI/RO applications.

P1 And P2 LEDs For Station And Lobe Ports

The P1 and P2 LED indications vary slightly for fiber ST and RJ45 ports.
The table below describes the LED indications for ports configured as
lobe or station ports.

Port LED Activity Meaning

GREEN Phantom current present (port inserted).

RJ45
Lobe or
Station

Fiber
Lobe

Fiber
Station

OFF No phantom current present (port wrapped).
Blinking RED

(Lobe port only)
GREEN Fiber key received (port inserted).

Blinking GREEN

Blinking RED Speed-fault condition caused the port to wrap.
OFF Rx disconnected - signal loss.
GREEN Fiber key received (port inserted).

Blinking GREEN

OFF Rx disconnected - signal loss.

Speed-fault condition caused the port to wrap.

The connection from the upstream device to
the Receive connection is complete but the
port is wrapped.

The connection from the upstream device to
the Receive connection is complete but the
port is wrapped.

QR-8

P1 And P2 LEDs For RI And RO Ports

The P1 and P2 LEDs indicate the status of the RI/RO ports as described
in the table.

Port LED Activity Meaning

GREEN Active (port open)
Blinking GREEN Autowrap condition (port wrapped).

RJ45
RI/RO

Fiber
RI/RO

Blinking RED

OFF No activity (port wrapped).
GREEN Rx connected, fiber key received.

Blinking GREEN

Speed-fault condition caused the port to
wrap.

The connection from the upstream device to
the Receive connection is complete but from
the Transmit connection to the downstream
device it is incomplete.

Blinking RED

OFF No connection.

Speed-fault condition caused the port to
wrap.

QR-9

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