Patton electronic 275, 2715 MULTIFRAMEG.704, CRC-4 MF, Unframed G.703 SW3 SW4, Clock Modes

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Switch SW2: CAS Multiframe

The Channel Associated Signaling (CAS) multiframe uses Timeslot 16 (TS16) to send multiframe (MF) alignment data. In CAS MF, a multi- frame is defined as 16 frames, where a frame consists of 32 64kb/s timeslots, numbered 0 to 31. TS16 of the first frame in the MF contains the CAS MF alignment word in the upper four bits. The alignment word is always 0000 (binary). The 2715 does not perform any signaling in TS16 other than to insert the MF alignment word, in order to maintain MF alignment. When CAS MF disabled, the unit transmits user data in TS16; therefore, up to 31 channels are available for user data. When it is enabled, TS16 is not available to the user. In this case, the user can use up to 30 channels for data. CAS MF can be used with CRC-4 MF or by itself. When enabled, both units must employ CAS MF; if one unit is set for CAS MF, and the other is not, the one using CAS MF will detect a loss of sync.

SW2

Option

Off

Disabled

On

Enabled

Switch SW3 & SW4: CRC-4 Multiframe/Clock mode

In framed mode, SW3 is used for CRC-4 MF. CRC-4 Multiframe uses Time Slot zero to carry CRC-4 information. It operates independently of CAS MF. When CRC-4 is enabled, the unit monitors the incoming data stream for CRC-4 errors. It transmits CRC-4 error counts to the trans- mitting unit. Excessive errors may cause loss of frame or loss of sync. If CRC-4 MF is used, both units must be set for set for CRC-4 MF. Otherwise, the one using CRC-4 MF will detect loss of sync.

In unframed mode, SW3 is used to along with SW4 to determine the clock mode. In unframed mode, the model 2715 can be set to network, internal or external clock mode. This is done by setting both SW3 and SW4 to the on position.

In framed mode SW4 is used alone to determine the 2715 transmitter timing. The 2715 can be set to Network or Internal clock.

The following charts represent both cases.

 

MULTIFRAME(G.704)

 

 

 

 

 

 

 

SW3

CRC-4 MF

 

SW4

 

Clock Mode

 

 

 

 

 

On

On

 

Off

 

Network

Off

Off

 

On

 

Internal

 

 

 

 

 

 

UNFRAMED (G.703)

 

 

 

SW3

SW4

Clock Mode

 

 

 

Off

Off

Network (Default)

Off

On

Internal

On

On

External

On

Off

Network

 

 

 

CLOCK MODES

Network Clock Transmitter timing is derived from the received line signal.

Internal Clock Transmitter clock is derived from an internal clock source.

External Clock Transmitter timing is derived from the local DTE device. Valid only in unframed mode.

Note: When using the 2715 as a high-speed short range modem, one unit of the link must be configured in either internal or external clock, and the other end must be configured for network clock mode.

Switches SW5, SW6, SW7, and SW8

Use Switches SW5, SW6, SW7, and SW8 to set the DTE data rate.

SW5

SW6

SW7

SW8

Speed

Off

Off

Off

Off

Clear Channel (2.048Mbps)

On

Off

Off

Off

64kbps

Off

On

Off

Off

128kbps

On

On

Off

Off

192kbps

Off

Off

On

Off

256kbps

On

Off

On

Off

384kbps

Off

On

On

Off

512kbps

On

On

On

Off

640kbps

Off

Off

Off

On

768kbps

On

Off

Off

On

1024kbps

Off

On

Off

On

1280kbps

On

On

Off

On

1536kbps

Off

Off

On

On

1600kbps

On

Off

On

On

1920kbps

Off

On

On

On

1984kbps

On

On

On

On

invalid

9

10

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Contents User Manual Patton Model Table of Contents Warranty StatementGeneral Information CE and Telecommunication Approvals Service InformationRadio and TV Interference Tel 301 Email support@patton.comSupported Applications FeaturesGeneral Product Description 2715 as the Interface between the Telco and CPESwitch SET Summary Table ConfigurationDIP Switch Configuration Switch SW1 Line CodingUnframed G.703 SW3 SW4 MULTIFRAMEG.704CRC-4 MF Clock ModesSoftware Configuration Introduction to Main Menu Helpful HintsSystem Configuration Line Format G.703 default Options G.703, G.704Line Coding HDB3 default 54 Loops Enabled default Options Enabled, Disabled CRC-4 Setting Disabled default Options Enabled, DisabledCAS MF Setting Disabled default Options Enabled, Disabled Default Config Source Switch default Options EEPROM, SwitchSystem Diagnostics Local Loop Idle defaultError Insertion Off default Options On, Off Remote Loop Idle defaultTest Pattern Idle default Options Idle or Sending SpacebarNI Status Current DIP Switch SettingsPassword Unit OptionsDTE Interface Connection Network Interface ConnectionTXD Power ConnectionLED Descriptions RXDALM Loop V.54 & Telco DiagnosticsLOS ERR511 BIT Error Rate V.52 DiagnosticsError Insertion to on 2047Specifications Patton Model Cable RecommendationsAppendix C DB9FJumper Position for Power via DC Power Jack default Connector, Terminal InterfacePatton Model Power Supply Interface Jumper Position for Power via Pin KKCopyright Patton Electronics Company All Rights Reserved