|
|
The E1-G.703/G.704 serial port adapters (PA-4E1G-120 and PA-4E1G-75) are available on Cisco 7500 series routers, Cisco 7200 series routers, and Cisco 7000 series routers with the 7000 Series Route Switch Processor (RSP7000) and 7000 Series Chassis Interface (RSP7000CI).
These port adapters provide up to four E1 synchronous serial interfaces, which are compatible with and specified by G.703/G.704. The PA-4E1G-120 supports balanced operation and the PA-4E1G-75 supports unbalanced operation with 15-pin, D-shell (DB-15) receptacles on the port adapters. Both port adapters operate in full-duplex mode at the E1 speed of 2.048-Mbps. These port adapters provide the following additional features and capabilities:
This feature is supported on these platforms:
For information on how to configure the E1-G.703/G.704 serial port adapter, refer to the "Configure a Synchronous Serial Interface" section in the "Configuring Interfaces" chapter of the Configuration Fundamentals Configuration Guide.
For information on other commands that can be used by the E1-G.703/G.704 serial port adapter, refer to the Cisco IOS Release 11.1 configuration guides.
The following example shows a configuration for serial interface 9/1/3 on a E1-G.703/G.704 serial port adapter in a Cisco 7500 series router. In this example, the interface is configured for framed (G.704) operation, and timeslot 16 is used for data.
router#configure terminalrouter(config)#interface serial 9/1/3router(config-if)#ip address 1.1.1.10 255.255.255.0router(config-if)#no keepaliverouter(config-if)#no fair-queuerouter(config-if)#timeslot 1-31router(config-if)#crc4router(config-if)#ts16router(config-if)#exitrouter(config)#exitrouter#
This section documents modified commands. All other commands used with this feature are documented in the Cisco IOS Release 11.1 command references.
To control which clock a G.703 E1 interface or an E1-G.703/G.704 serial port adapter will use to clock its transmitted data from, use the clock source interface configuration command. The no form of this command restores the default value.
clock source {line | internal}| line | Specifies that the interface will clock its transmitted data from a clock recovered from the line's receive data stream (default). |
| internal | Specifies that the interface will clock its transmitted data from its internal clock. |
By default, the applique uses the line's receive data stream.
Interface configuration
This command first appeared in Cisco IOS Release 10.3.
This command was modified in Cisco IOS Release 11.1 CA to include the Cisco 7200 series router.
This command applies to a Cisco 4000 router or Cisco 7000 series, Cisco 7200 series, and Cisco 7500 series router. A G.703-E1 interface or E1-G.703/G.704 serial port adapter can clock its transmitted data from either its internal clock or from a clock recovered from the line's receive data stream.
The following example specifies the G.703-E1 interface to clock its transmitted data from its internal clock:
interface serial 0/1 clock source internal
To enable generation of CRC4 (per ITU Recommendation G.704 and G.703) to improve data integrity, use the crc4 interface configuration command. To disable this feature, use the no form of this command.
crc4This command has no arguments or keywords.
Disabled
Interface configuration
This command first appeared in Cisco IOS Release 10.3.
This command was modified in Cisco IOS Release 11.1 CA to include the Cisco 7200 series router and the E1-G.703/G.704 serial port adapter.
This command applies to a Cisco 4000 router, Cisco 7200 series, Cisco 7000 series, and Cisco 7500 series router. This command is supported on the FSIP and the E1-G.703/G.704 serial port adapter.
This command is useful for checking data integrity while operating in framed mode. CRC4 provides additional protection for a frame alignment signal under noisy conditions. For data transmission at E1 (2.048 Mbps), the G.704 standard suggests 4 bits CRC. Refer to CCITT Recommendation G.704 for a definition of CRC4.
You can also use the crc command to set the CRC size for the HDLC controllers.
The following example enables CRC4 generation on the E1-G.703/G.704 serial port adapter and also sets the CRC size to 32 bits:
interface Serial 0/0 crc 32 crc4
To enable framed mode serial interface on a G.703 E1 port adapter on an FSIP or on an E1-G.703/G.704 serial port adapter, use the timeslot interface configuration command. To restore the default, use the no form of this command or set the start slot to 0.
timeslot start-slot - stop-slot| start-slot | The first subframe in the major frame. Range is 1 to 31 and must be less than or equal to stop-slot. |
| stop-slot | The last subframe in the major frame. Range is 1 to 31 and must be greater than or equal to start-slot. |
A G.703 E1 interface is configured for unframed mode.
Interface configuration
This command first appeared in Cisco IOS Release 10.3.
This command was modified in Cisco IOS Release 11.1 CA to include the E1-G.703/G.704 serial port adapter and Cisco 7200 series routers.
This command applies to a Cisco 4000 router or Cisco 7000 series, Cisco 7200 series, and Cisco 7500 series router. G.703 E1 interfaces have two modes of operation, framed and unframed. When in framed mode, the range from start-slot to stop-slot gives the number of 64-kbps slots in use. There are 32 64-kbps slots available.
In framed mode, timeslot 16 is not used for data. To use timeslot 16 for data, use the ts16 interface command.
The following example enables framed mode on a serial interface on a G.703 E1 port adapter:
interface serial 3/0 timeslot 1-3
To control the use of time slot 16 for data on a G.703 E1 interface or on a E1-G.703/G.704 serial port adapter, use the ts16 interface configuration command. To restore the default, use the no form of this command.
ts16This command has no arguments or keywords.
Time slot 16 is used for signaling.
Interface configuration
This command first appeared in Cisco IOS Release 10.3.
This command was modified in Cisco IOS Release 11.1 CA to include the Cisco 7200 series router.
This command applies to a Cisco 4000 router or Cisco 7000 series, Cisco 7200 series, and Cisco 7500 series router. By default, time slot 16 is used for signaling. Use this command to configure time slot 16 to be used for data. When in framed mode, in order to get all possible subframes or timeslots, you must use the ts16 command.
The following example configures time slot 16 to be used for data on a G.703 E1 interface:
ts16
For more information on the E1-G.703/G.704 serial port adapter, refer to the E1-G.703/G.704 Serial Port Adapter (PA-4E1G-120 and PA-4E1G-75) Installation and Configuration publication.
|
|