On a 2-port or 4-port Channelized T3 SPA, when one of the T3 ports is configured as DS3 clear channel interface and the other T3s are configured with large number (greater than or equal to 400) of low bandwidth channels (NxDS0, N=1, 2, 3, or 4), the DS3 clear channel interface is not able to run at 100% DS3 line rate when those low bandwidth channels are idle (that is, not transmitting or receiving packets). This issue does not occur if those low bandwidth channels are not idle.
On a 2-Port and 4-Port Channelized T3 SPA or 1-Port Channelized OC-3/STM-1 SPA, the maximum number of channels is limited to 1023 per SPA.
On a 2-Port and 4-Port Channelized T3 SPA or 1-Port Channelized OC-3/STM-1 SPA, the maximum number of FIFO buffers is 4096. The FIFO buffers are shared among the interfaces; how they are shared is determined by speed. If all the FIFO buffers have been assigned to existing interfaces, a new interface cannot be created, and the "%Insufficient FIFOs to create channel group" error message is seen. FIFO allocation information is provided in Table 17-1.
To find the number of available FIFO buffers, use the show controller t3 command:
On the 1-Port Channelized OC-12/STM-4 SPA, the SDH, E1/E3 modes are not supported.
On the 1-Port Channelized OC-12/STM-4 SPA, the MFR, FRF.12 (in sync with other channelized SPAs on SIP400) is not supported.
On the 4-Port Serial Interface SPA with Cisco 7600 SIP- 400, the following features are not supported:
– Multilink Point to Point Protocol (MLPPP)
– Multilink Frame Relay (MLFR)
– Frame Relay Forum (FRF).12
– Real Time Protocol (RTP) header compression
– Data compression formats such as PPP STAC compression, FRF.9, data compression over frame relay, and Microsoft Point-to-Point Compression (MPPC).
Note Effective from Cisco IOS Release 15.1(3)S and 12.2(33)SRE05, the SPA-1xCHOC12/DS0 boots up with admin down status and the original SPA status is restored after one second of the SPA bootup. Please wait for a second after the log message "SPA_OIR-6-ONLINECARD: SPA (SPA-1XCHOC12/DS0) online in subslot" is displayed, to configure the SPA.
The following is a list of some of the significant software features supported by the 2- and 4-Port T3/E3 SPA, the 8-Port Channelized T1/E1 SPA, the 1-Port Channelized OC-3/STM-1 SPA, and the 2- and 4-Port CT3 SPAs.
Software selectable between T1, E1, T3 or E3 framing on each card (ports are configured as all T1, E1, T3, or E3). Applies to the 2- and 4-Port T3/E3 SPA and 8-Port Channelized T1/E1 SPA.
Layer 2 encapsulation support:
– Point-to-Point Protocol (PPP)
– High-level Data Link Control (HDLC)
– Frame Relay
Internal or network clock (selectable per port)
Online insertion and removal (OIR)
Hot standby router protocol (HSRP)
Alarm reporting: 24-hour history maintained, 15-minute intervals on all errors
16- and 32-bit cyclic redundancy checks (CRC) supported (16-bit default)
Local and remote loopback
Bit error rate testing (BERT) pattern generation and detection per port
Note On the 8-Port Channelized T1/E1 SPA, BERT is not supported.
Programmable BERT patterns enhancements
Note On the 8-Port Channelized T1/E1 SPA, the programmable BERT patterns enhancements are not supported.
Note On the 2- and 4-Port T3/E3 SPAs, the programmable BERT patterns enhancements are: - supported when the framing mode is M13 or C-bit. - not supported when the framing mode is bypass.
Dynamic provisioning—Dynamic provisioning allows for the addition of new customer circuits within a channelized interface without affecting other customers.
Network Clocking and the Synchronization Status Message(SSM) functionality for the Channelized SPAs in a Cisco 7600 SIP-400 only. The Channelized SPAs supporting this feature for Cisco IOS Release 15.0(1)S are:
– 8-Port Channelized T1/E1 SPA
– 1-Port Channelized OC3/STM-1 SPA
The Channelized SPA supporting this feature for Cisco IOS Release 15.1(1)S is:
– Data rates in multiples of 56 Kbps or 64 Kbps per channel
– Maximum 1.536 Mbps for each T1 port
– D4 Superframe (SF) and Extended Superframe (ESF) support for each T1 port
– ANSI T1.403 and AT&T TR54016 CI FDL support
– Internal and receiver recovered clocking modes
– Short haul and long haul channel service unit (CSU) support
– Binary eight-zero substitution (B8ZS) and alternate mark inversion (AMI) line encoding
Note B8ZS and AMI line encoding are not configurable for TW on the 2-Port and 4-Port Channelized T3 SPA.
– Support for Multilink Point to Point Protocol (MLPPP) for full T1s on the same SPA (hardware based) and across SPAs (software based)
– Support for Multilink Frame Relay (MLFR)
– Maximum 1.984 Mbps for each E1 port in framed mode and a 2.048 Mbps in unframed E1 mode
– All ports can be fully channelized down to DS0
– Compliant with ITU G7.03, G.704, ETSI and ETS300156
– Internal and receiver recovered clocking modes
– Hi-density bipolar with three zones (HDB3) and AMI line encoding
– Support for MLPPP for full E1s on the same SPA (hardware based) and across SPAs (software based).
– Support for MLFR
– Full-Duplex connectivity at E3 rate (34.368 MHz)
– Supports ITU-T G.751 or G.832 framing (software selectable)
– HD3B line coding
– Compliant with E3 pulse mask
– Line build-out: configured for up to 450 feet (135 m) of type 728A or equivalent coaxial cable
– Loopback modes: data terminal equipment (DTE), local, dual, and network
– E3 alarm/event detection (once per second polling)
- Alarm indication signal (AIS)
- Loss of frame (LOF)
- Remote alarm indication (RAI)
– Subrate and scrambling features for these data service unit (DSU) vendors:
- Digital Link
- ADC Kentrox
– Binary 3-zero substitution (B3ZS) line coding
– Compliant with DS3 pulse mask per ANSI T1.102-1993
– DS3 far-end alarm and control (FEAC) channel support
– Full-Duplex connectivity at DS3 rate (44.736 MHz)
– 672 DS0s per T3
– Loopback modes: DTE, local, remote, dual, and network
– C-bit or M23 framing (software selectable)
– Line build-out: configured for up to 450 feet (135 m) of type 734A or equivalent coaxial cable
– DS3 alarm/event detection (once per second polling)
- Out of frame (OOF)
- Far-end receive failure (FERF)
– Generation and termination of DS3 Maintenance Data Link (MDL) in C-bit framing
– Full FDL support and FDL performance monitoring
– Subrate and scrambling features for these DSU vendors:
- Digital Link
- ADC Kentrox
Note On a 2-port or 4-port Channelized T3 SPA, when one of the T3 ports is configured as DS3 clear channel interface and the other T3s are configured with large number (greater than or equal to 400) of low bandwidth channels (NxDS0, N=1, 2, 3, or 4), the DS3 clear channel interface is not able to run at 100% DS3 line rate when those low bandwidth channels are idle (that is, not transmitting or receiving packets). This issue does not occur if those low bandwidth channels are not idle.
The following features are supported on the 1-Port Channelized OC-12/STM-4 SPA:
CCAT POS, DS3/E3, VCAT POS/Ethernet interfaces
Maximum of 128 VCAT groups (VCG)
Each VCG configurable for HDLC, GFP Framing (Layer 1)
Each VCG can carry POS (hdlc/ppp/frame-relay) or Ethernet payload (Layer 2)
Bandwidth on each VCG can be NxSTS-1/NxVT1.5/NxVT2
Maximum of 48 high-order (STS-1) members in a VCG
Maximum of 64 low-order (VT1.5/VT2) members in a VCG
Maximum of 336 VT1.5/252 VT2 members per SPA
Link Capacity Adjustment Scheme (LCAS)
These are the major features supported for the 4-Port Serial SPA on Cisco 7600 SIP-400:
IP packet switching
8 Mbps in synchronous mode per port on V.35/RS-449 cables in HDLC mode and 4 Mbps in firmware multilink mode. For all other cables, 128 KBPS in synchronous mode.
Clock signal configuration
– For DTE: Loop clocking, normal clocking, and inversion.
– For DCE: Internal clocking.
Data signal inversion
Non Return to Zero (NRZ) or Non Return to Zero Inverted (NRZI) encoding
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Displaying the SPA Hardware Type
To verify the SPA hardware type that is installed in your Cisco 7600 series router, you can use the show diagbus command or the show interface command (once the interface has been configured). There are several other commands on the Cisco 7600 series router that also provide SPA hardware information.
Table 17-2 shows the hardware description that appears in the show command output for each type of SPA that is supported on the Cisco 7600 series router.
Table 17-2 SPA Hardware Descriptions in show Commands
Description in show interfaces and show controllers Commands
4-Port T3/E3 SPA
“Hardware is SPA-4XT3/E3”
2-Port T3/E3 SPA
“Hardware is SPA-2XT3/E3”
8-Port Channelized T1/E1 SPA
“Hardware is SPA-T1E1”
2-Port CT3 SPA
“Hardware is 2 ports CT3 SPA”
4-Port CT3 SPA
“Hardware is 4 ports CT3 SPA”
1-Port Channelized OC12/STM-4 SPA
“Hardware is 1 port CHOC12/STM-4 SPA”
Virtual Tributary Alarms
Seven circuit emulation alarm types on the virtual tributary are introduced with the Cisco IOS Release 12.2(33)SRE and Cisco IOS Release 12.2(33)SRC4 on the 1-Port Channelized STM-1/OC-3 SPA. The alarm details are displayed with the show controller output on the 1-Port Channelized STM-1/OC-3 SPA.
These are described in the following table:
Indicates an LOP on the virtual tributary level
Indicates an AIS on the virtual tributary level
Remote Defect Indication on the virtual tributary level
Indicates that the virtual tributary sizes are not the same, like VT-E1 and VT-T1
Indicates that there is a mismatch on the virtual tributaries
Indicates that there is a SONET trace mismatch on the virtual tributary level
Remote Failure Indication on the virtual tributary level
Examples of the show interface Command
The following example shows output from the show interface serial 5/0/0 command on a Cisco 7600 series router with a 4-Port T3/E3 SPA installed in slot 5:
Serial5/0/0 is up, line protocol is up
Hardware is SPA-4XT3/E3[3/0]
MTU 4470 bytes, BW 44210 Kbit, DLY 200 usec,
reliability 248/255, txload 1/255, rxload 1/255
Encapsulation HDLC, crc 16, loopback not set
Keepalive set (10 sec)
Last input 00:00:06, output 00:00:07, output hang never
Last clearing of ''show interface'' counters 00:00:01
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0