Zhone 3920Plus Bedienerhandbuch PDF herunterladen (Seite 94)

COMSPHERE 392xPlus Modems

5-18 October 1998 3920-A2-GH30-40

Table 5-1

(9 of 9)

DTE Interface Configuration Options — Multiport Mode l

Port TXC Source: Internal

Nxt Internal External

Port Transmit Clock Source. Determines the clock source used to clock transmit data into the port buffer from Pin 2

(TXD) of the EIA-232-D interface. The port buffer is used to compensate for timing differences when a port is connected

via a crossover cable to another modem’s EIA-232-D interface.

Internal – The data input to the port buffer (from Pin 2 of the EIA-232-D interface) is clocked into the buffer using the

modem’s transmit clock. (The modem’s transmit clock is determined by the TX Clock Source configuration option.) Data

is removed from the buffer using this same clock.

External – The data input to the port buffer (from Pin 2 of the EIA-232-D interface) is clocked into the buffer using the

clock source provided on Pin 24 (XTXC) of the EIA-232-D interface. Data is removed from the buffer using the modem’s

transmit clock. (The modem’s transmit clock is determined by the TX Clock Source configuration option.)

NOTE: The port buffer is re-centered each time RTS is turned ON. If there is a lack of clock synchronization, frequent

toggling of RTS will prevent the loss of data due to buffer overflow or underflow.

DTE Alarm Mask: Disable

Nxt Disable Enable

DTE Alarm Mask. Allows you to enable or disable the reporting of DTE alarms (per port) to the front panel and/or NMS.

Enable – Does not report alarms.

Disable – Reports alarms.

Extend Main Ch.: Disable

Nxt Disable Enable

Primary data can only be extended one link.

Extend Main Channel. Supports extended diagnostics. Specifies whether there is main (primary) channel connectivity

between the modem’s DTE ports and the DTE ports of modems one level below (downstream) or above (upstream) in

the diagnostic network.

Enable – If this configuration option is set to Enable on a port of a tributary modem, test mode is propagated to the

modems downstream when test mode goes ON for that port.

Disable – If this configuration option is set to Disable on a port of a tributary modem, test mode is not propagated for

that port and primary channel data is clamped when in test mode.

NOTE: For an extended control modem, this configuration option is used along with the upstream port number where

the main (primary) channel is extended.

NOTE: For an extended port using V.34 modulation, only a single port rate is used for all the modem’s line rates. Refer

to the Extended Point-to-Point section in Appendix G, Sample Configurations.

Upstream Port: Port1

End Port1 Port2 Port3 Port4 Port5 Port6 Port7 Port8

This configuration only appears when the Extended Main Channel is enabled.

Upstream Port. When an extended control modem’s main (primary) channel is connected to a tributary modem that is

one link above it in the diagnostic network, this configuration option is set to the port number to which it is connected on

the tributary modem.

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