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Cisco 12000/10700 v3.1.1 Router Manager User Guide
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Chapter 8 Interface Configuration POS Interface Configuration

POS Interface Configuration Window—Detailed Description

The PO S In terface Configurat ion wi ndow conta ins one t ab, POS C onfig.

POS Config Tab

The POS Config tab (see Figure 8-6) contains four areas: General, SONET Overhead, Alarm Reporting
and Thr es hold, a nd Al arm Re portin g.
General
The General area contains the following fields:
POS SPE Scrambling—Enable or disable POS SPE scr ambling. Scrambling is similar to encrypting. The
enabled option is selected by default.
Loopback—Choose the loop back mo de. The fol lowing options are available:
Internal—Packets are transmitted back to the source to test the interface functionality and ensure
that packets transmitted through the interface reach the destination without data loss.
Line—Rest ric ts c onnec ti on st atus (su ccess o r fa ilure ) messag es from be ing rec eived.
Disabled—Disables t he lo opba ck m ode.
Clock Source—Choose a clock source from the a vailable options. Th ere is a clock in e very de vice, whic h
measures the speed of the device. This can either be Internal (within the device) or Line (network clock).
Keepalive—Set ke epali v e p eriod. Th e system sends p acket s after this inte rv al to kno w i f the inter fa ce or
the network is up for routing packets. By default this interval is 10 seconds.
POS Framing—Choose the ty pe of POS framing, SDH or SONET.
Encapsulation—Select HDLC, PPP or FRAME-RELAY encapsulation type.
Cyclic Redu nda ncy Chec k—Ch oose an opti on for cycli c red unda ncy che ck. Cy cli c re dund an cy checks
consist s o f 16 or 32 bit verification c ode w h ich has to be sam e at both the tra nsm itting a nd rec eiving
ends to ensu re the p ackets s en t ar e re ceived in f ull w it hout loss o f data. By defau lt, it is 32 bit c od e.
SONET Ov erh ead
The Sone t Overhea d area contai ns the following fields :
Path Signal Identifier—Permissib le values range from 0 to 255.
Section Tr ace Byte—Pe rmissi ble values range fr om 0 to 255.
Payload Pointer Byte—Choose an option for pa yload point er byte from the drop down menu.
Permissibl e values range f rom 0 to 3.

Alarm Reporting & Threshold

The Alarm R ep orti ng & Th resho ld are a a llows yo u t o c onfigure a nd en able al a rms gene rat e d by the
system. This area contains the following fields:
B1 BER Threshold Cros sing Alarm (TCA)—Set threshold limits for the system to prompt appropriate
B1 BER T CA t h reshold a larm m es sag es. T he field be side t his value disp lays the thr eshol d for the B 1
BER TCA.